{"id":628,"date":"2023-08-04T10:08:46","date_gmt":"2023-08-04T08:08:46","guid":{"rendered":"https:\/\/negativnacestach.cz\/?p=628"},"modified":"2026-07-22T15:31:25","modified_gmt":"2026-07-22T13:31:25","slug":"repro-claron","status":"publish","type":"post","link":"https:\/\/negativnacestach.cz\/en\/repro-claron\/","title":{"rendered":"Schneider-Kreuznach Repro-Claron"},"content":{"rendered":"<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-794e3cfa wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:30%\">\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6a6456f84ac6c&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6a6456f84ac6c\" class=\"wp-block-image size-large wp-lightbox-container\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"819\" height=\"1024\" data-attachment-id=\"630\" data-permalink=\"https:\/\/negativnacestach.cz\/en\/repro-claron\/1-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/1-1.webp?fit=1600%2C2000&amp;ssl=1\" data-orig-size=\"1600,2000\" data-comments-opened=\"1\" data-image-title=\"\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/1-1.webp?fit=819%2C1024&amp;ssl=1\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on--pointerdown=\"actions.preloadImage\" data-wp-on--pointerenter=\"actions.preloadImageWithDelay\" data-wp-on--pointerleave=\"actions.cancelPreload\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/1-1.webp?resize=819%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-630\" style=\"aspect-ratio:0.7998191623340976\" srcset=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/1-1.webp?resize=819%2C1024&amp;ssl=1 819w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/1-1.webp?resize=240%2C300&amp;ssl=1 240w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/1-1.webp?resize=120%2C150&amp;ssl=1 120w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/1-1.webp?resize=768%2C960&amp;ssl=1 768w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/1-1.webp?resize=1229%2C1536&amp;ssl=1 1229w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/1-1.webp?w=1600&amp;ssl=1 1600w\" sizes=\"auto, (max-width: 819px) 100vw, 819px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\tdata-wp-bind--aria-label=\"state.thisImage.triggerButtonAriaLabel\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.thisImage.buttonRight\"\n\t\t\tdata-wp-style--top=\"state.thisImage.buttonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewbox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:70%\">\n<p class=\"wp-block-paragraph translation-block\">Back then when people thought radiation was basically a vitamin, they crammed it into everything from face masks to toothpaste (<a href=\"https:\/\/en.wikipedia.org\/wiki\/Radium_Girls\">Radium girls<\/a> gives it a thumbs down), optics manufacturers weren't far behind (but hey, at least in their case it actually did something useful, Ji\u0159\u00ed Zouhar gives it a thumbs up).<\/p>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">To squeeze out a higher refractive index and cut down on dispersion (yeah, the photos looked a whole damn R\u00f6entgen better), they started making so-called <a href=\"https:\/\/www.stanfordmaterials.com\/blog\/lanthanum-oxide-in-glass-production.html#:~:text=Lanthanumoxide(LaO)isacriticalcomponent,makingitessentialinvarioushigh-precisionapplications\">lanthanum<\/a> and earlier <a href=\"https:\/\/en.wikipedia.org\/wiki\/Thoriated_glass\">thorium glass<\/a>\u2014meaning the optical elements had <a href=\"https:\/\/en.wikipedia.org\/wiki\/Lanthanum_oxide\">lanthanum oxide (La\u2082O\u2083)<\/a> or good ol' radioactive <a href=\"https:\/\/en.wikipedia.org\/wiki\/Thorium_dioxide\">thorium dioxide (ThO\u2082)<\/a> baked right into the glass mix.\u00a0This wasn't just some coating like with anti-reflective layers, but an inseparable part of the glass mass itself where thorium content could reach up to 30%.\u00a0Because of the radioactive decay of thorium isotopes, the Canadian balsam used for cementing lens elements would turn yellow over time, which, among other things, gave the photos a nice golden tint. The discoloration can be reversed by annealing the glass or exposing it to UV light\u2014just stick it out in the sun, let it marinate for a while and voil\u00e0.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Thorium in lenses was more commonly used from the 1940s to the 1970s, especially from Asahi, Kodak and Schneider-Kreuznach. Eventually it turned out thorium wouldn't actually kill you\u2014but the fear of thorium definitely killed off thorium.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"translation-block\">Canada balsam (marginally also <em>Canadian turpentine<\/em>) is a mixture of oil and resin obtained from the Balsam Fir <em>(<\/em><em>Abies balsamea)<\/em>. It is traditionally used, for example, as a medium for fixing laboratory specimens, as it is invisible when dry. When it is mixed in a 1:1 ratio with xylene, it produces a mixture with almost identical refractive index (which is very similar even without xylene) as a crown glass (n = 1.55). This is why it has found applications in the binding of lenses and optical systems. When you don't have anything to do during the long winter evenings and you feel like burning the mucous membranes or teasing the nervous system is the thing, I recommend opening a bottle of xylene.<\/li>\n\n\n\n<li>Today's lenses and optics are no longer cemented this way\u2014UV fixation is used. It's an irreversible method (which can be a disadvantage, older lenses could be re-cemented by heat) and does not change over time, so you no longer encounter element separation caused by balm degradation.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-columns alignwide are-vertically-aligned-top is-layout-flex wp-container-core-columns-is-layout-ad9358c1 wp-block-columns-is-layout-flex\" style=\"padding-right:0;padding-left:0\">\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<p class=\"wp-block-paragraph\">Some lenses have emitted over 3 \u03bcSv\/h, which is <em>not great, not terrible<\/em>\u2014however, thorium emits \"only\" \u03b1 and \u03b2 radiation, so as long as you don't eat those lenses or roll around naked in them for long periods of time, you're fine. I guess. Either way, the lens is very nice, it just needs a really big camera or a really long bellows because of the long focal length. In any case\u2014really big muscles. However, it's fun to work with and it's radiating joy and emmiting fun. Heh.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hear the truth: for every millimeter of your lens's focal length, you need just as many millimeters of bellows to focus at infinity. So, if you're rocking a Claron with a 610 mm focal length, you'll need at least 610 mm of bellows to even start playing the game. But wait - want to focus closer? That eats up more millimeters. Want a life-size 1:1 reproduction? Buckle up, because now you'll need double the extension\u20141220 mm.\u00a0That'll make you look like a badass even among accordion players.<\/li>\n\n\n\n<li class=\"translation-block\">But wait, there's more! Your exposure is only accurate at infinity focus. The moment you extend the bellows, light starts vanishing like dreams and hopes. So you need to compensate - exposure correction for bellows extension. Then throw in filter factors. And just to kick you while you're down,\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Reciprocity_(photography)#Schwarzschild_law\">Schwarzschild effect<\/a> says hi. Well, welcome to\u00a0<s>Jackass<\/s>\u00a0large format.<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<div class=\"wp-block-jetpack-slideshow\" data-autoplay=\"true\" data-delay=\"3\" data-effect=\"slide\" style=\"--aspect-ratio:calc(815 \/ 1024)\"><div class=\"wp-block-jetpack-slideshow_container swiper\"><ul class=\"wp-block-jetpack-slideshow_swiper-wrapper swiper-wrapper\"><li class=\"wp-block-jetpack-slideshow_slide swiper-slide\"><figure><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"815\" height=\"1024\" alt=\"\" class=\"wp-block-jetpack-slideshow_image wp-image-640\" data-id=\"640\" data-aspect-ratio=\"815 \/ 1024\" src=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.1-8x1022-1.webp?resize=815%2C1024&#038;ssl=1\" srcset=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.1-8x1022-1.webp?resize=815%2C1024&amp;ssl=1 815w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.1-8x1022-1.webp?resize=239%2C300&amp;ssl=1 239w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.1-8x1022-1.webp?resize=119%2C150&amp;ssl=1 119w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.1-8x1022-1.webp?resize=768%2C965&amp;ssl=1 768w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.1-8x1022-1.webp?resize=1223%2C1536&amp;ssl=1 1223w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.1-8x1022-1.webp?resize=1200%2C1508&amp;ssl=1 1200w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.1-8x1022-1.webp?w=1592&amp;ssl=1 1592w\" sizes=\"(max-width: 815px) 100vw, 815px\" \/><\/figure><\/li><li class=\"wp-block-jetpack-slideshow_slide swiper-slide\"><figure><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"815\" height=\"1024\" alt=\"\" class=\"wp-block-jetpack-slideshow_image wp-image-641\" data-id=\"641\" data-aspect-ratio=\"815 \/ 1024\" src=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.2-8x1022-1.webp?resize=815%2C1024&#038;ssl=1\" srcset=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.2-8x1022-1.webp?resize=815%2C1024&amp;ssl=1 815w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.2-8x1022-1.webp?resize=239%2C300&amp;ssl=1 239w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.2-8x1022-1.webp?resize=119%2C150&amp;ssl=1 119w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.2-8x1022-1.webp?resize=768%2C965&amp;ssl=1 768w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.2-8x1022-1.webp?resize=1223%2C1536&amp;ssl=1 1223w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.2-8x1022-1.webp?resize=1200%2C1508&amp;ssl=1 1200w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/2.2-8x1022-1.webp?w=1592&amp;ssl=1 1592w\" sizes=\"(max-width: 815px) 100vw, 815px\" \/><\/figure><\/li><\/ul><a class=\"wp-block-jetpack-slideshow_button-prev swiper-button-prev swiper-button-white\" role=\"button\"><\/a><a class=\"wp-block-jetpack-slideshow_button-next swiper-button-next swiper-button-white\" role=\"button\"><\/a><a aria-label=\"Pause Slideshow\" class=\"wp-block-jetpack-slideshow_button-pause\" role=\"button\"><\/a><div class=\"wp-block-jetpack-slideshow_pagination swiper-pagination swiper-pagination-white\"><\/div><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-794e3cfa wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:27%\">\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6a6456f850cd3&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6a6456f850cd3\" class=\"wp-block-image aligncenter size-large wp-lightbox-container\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"778\" data-attachment-id=\"647\" data-permalink=\"https:\/\/negativnacestach.cz\/en\/repro-claron\/3-priklad-extremni-vinetace-a-nedostatecneho-pokryvu\/\" data-orig-file=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/3-Priklad-extremni-vinetace-a-nedostatecneho-pokryvu.webp?fit=2000%2C1520&amp;ssl=1\" data-orig-size=\"2000,1520\" data-comments-opened=\"1\" data-image-title=\"\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Pr\u030ci\u0301klad extre\u0301mni\u0301 vine\u030ctace a nedostatec\u030cne\u0301ho pokryvu&lt;\/p&gt;\" data-large-file=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/3-Priklad-extremni-vinetace-a-nedostatecneho-pokryvu.webp?fit=1024%2C778&amp;ssl=1\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on--pointerdown=\"actions.preloadImage\" data-wp-on--pointerenter=\"actions.preloadImageWithDelay\" data-wp-on--pointerleave=\"actions.cancelPreload\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/3-Priklad-extremni-vinetace-a-nedostatecneho-pokryvu.webp?resize=1024%2C778&#038;ssl=1\" alt=\"\" class=\"wp-image-647\" srcset=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/3-Priklad-extremni-vinetace-a-nedostatecneho-pokryvu.webp?resize=1024%2C778&amp;ssl=1 1024w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/3-Priklad-extremni-vinetace-a-nedostatecneho-pokryvu.webp?resize=300%2C228&amp;ssl=1 300w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/3-Priklad-extremni-vinetace-a-nedostatecneho-pokryvu.webp?resize=150%2C114&amp;ssl=1 150w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/3-Priklad-extremni-vinetace-a-nedostatecneho-pokryvu.webp?resize=768%2C584&amp;ssl=1 768w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/3-Priklad-extremni-vinetace-a-nedostatecneho-pokryvu.webp?resize=1536%2C1167&amp;ssl=1 1536w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/3-Priklad-extremni-vinetace-a-nedostatecneho-pokryvu.webp?resize=1200%2C912&amp;ssl=1 1200w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/3-Priklad-extremni-vinetace-a-nedostatecneho-pokryvu.webp?w=2000&amp;ssl=1 2000w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\tdata-wp-bind--aria-label=\"state.thisImage.triggerButtonAriaLabel\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.thisImage.buttonRight\"\n\t\t\tdata-wp-style--top=\"state.thisImage.buttonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewbox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><figcaption class=\"wp-element-caption\">Example of extreme vignetting and insufficient coverage<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:70%\">\n<p class=\"wp-block-paragraph translation-block\">Now let's get to the crux of the matter (emmiter?): the Claron. This thing sits in a monstrous Compound 5 shutter and when you slap it onto an 8x10\" camera, it turns into a respectable telephoto with a full-frame equivalent focal length of about 89 mm. As mentioned earlier, this means you're gonna need loooong bellows and also strong back\u2014see the photos below for evidence. Coverage-wise, this beast throws an image circle of up to 518 mm at infinity\u00a0with an angle of view around 46\u00b0. That's obscene. The rendering is exactly what you'd expect from a process\/repro lens: clinically sharp and contrasty as heck even wide open. Sure, f9 won't win any races in the speed department, but when paired with that long focal length and the sheer size of 8x10\" and bigger, you still get a satisfyingly shallow depth of field. The subject pops cleanly from the background, enough to justify throwing around words like <em>plasticity<\/em> and <em>3D effect<\/em> without sounding like a complete tosser.<\/p>\n<\/div>\n<\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"translation-block\">Let's talk about the <a href=\"https:\/\/en.wikipedia.org\/wiki\/Image_circle\">image circle<\/a>. If it's too small, you'll end up with vignetting: dark corners, shadowy sides, or in the worst case scenario a sad little circular image floating in black like you used a bad lenshood. But if the coverage is generous enough (like here), the frame stays well-lit, sharp across the board and gives you plenty of wiggle room for all those glorious <a href=\"http:\/\/www.lukehealey.com\/large_format_movements.pdf\">camera movements<\/a>\u2014tilts, shifts, swings and whatever will row your boat.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Give the Claron a proper stopping-down, yank that bellows out and boom\u2014at 1:1 magnification, the image circle balloons to 1036 mm. That's over a goddamn meter. One meter by one meter. What can you shoot with that? Anything. Whatever the hell you want. With this lens, you answer to no one. This chunk of glass will fulfill your most unhinged large format fantasies and still leave a few millimeters of coverage as a dessert. \nJust be careful at airport security\u2014they might not share your enthusiasm. Try walking through a radiation detector with a thorium-packed artillery shell like this in your carry-on, and chances are you'll be the one fulfilling someone else's wildest fantasies. Someone with a gloved hand and a flashlight.<\/p>\n\n\n\n<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-794e3cfa wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:28%\">\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6a6456f851af1&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6a6456f851af1\" class=\"wp-block-image size-full wp-container-content-69bc4bdf wp-lightbox-container\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"678\" height=\"688\" data-attachment-id=\"657\" data-permalink=\"https:\/\/negativnacestach.cz\/en\/repro-claron\/4-tabulka-rady-repro-claron-nevalne-kvality-a-neznameho-puvodu\/\" data-orig-file=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/4-Tabulka-rady-Repro-Claron-nevalne-kvality-a-neznameho-puvodu.webp?fit=678%2C688&amp;ssl=1\" data-orig-size=\"678,688\" data-comments-opened=\"1\" data-image-title=\"\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Tabulka r\u030cady Repro-Claron nevalne\u0301 kvality a nezna\u0301me\u0301ho pu\u030avodu&lt;\/p&gt;\" data-large-file=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/4-Tabulka-rady-Repro-Claron-nevalne-kvality-a-neznameho-puvodu.webp?fit=678%2C688&amp;ssl=1\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on--pointerdown=\"actions.preloadImage\" data-wp-on--pointerenter=\"actions.preloadImageWithDelay\" data-wp-on--pointerleave=\"actions.cancelPreload\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/4-Tabulka-rady-Repro-Claron-nevalne-kvality-a-neznameho-puvodu.webp?resize=678%2C688&#038;ssl=1\" alt=\"\" class=\"wp-image-657\" style=\"aspect-ratio:0.9854735618826264\" srcset=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/4-Tabulka-rady-Repro-Claron-nevalne-kvality-a-neznameho-puvodu.webp?w=678&amp;ssl=1 678w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/4-Tabulka-rady-Repro-Claron-nevalne-kvality-a-neznameho-puvodu.webp?resize=296%2C300&amp;ssl=1 296w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/4-Tabulka-rady-Repro-Claron-nevalne-kvality-a-neznameho-puvodu.webp?resize=148%2C150&amp;ssl=1 148w\" sizes=\"auto, (max-width: 678px) 100vw, 678px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\tdata-wp-bind--aria-label=\"state.thisImage.triggerButtonAriaLabel\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.thisImage.buttonRight\"\n\t\t\tdata-wp-style--top=\"state.thisImage.buttonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewbox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><figcaption class=\"wp-element-caption\">Repro-Claron series chart of poor quality and unknown origin<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:71%\">\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6a6456f8525e5&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6a6456f8525e5\" class=\"wp-block-image size-large wp-container-content-69bc4bdf wp-lightbox-container\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"409\" data-attachment-id=\"658\" data-permalink=\"https:\/\/negativnacestach.cz\/en\/repro-claron\/5-repro-claron-na-sinaru-s-8x10%22-s-reflexnim-binokularnim-hledackem-a-pridavnym-mechem-4x5%22\/\" data-orig-file=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/5-Repro-Claron-na-Sinaru-S-8x1022-s-reflexnim-binokularnim-hledackem-a-pridavnym-mechem-4x522-1.webp?fit=2000%2C798&amp;ssl=1\" data-orig-size=\"2000,798\" data-comments-opened=\"1\" data-image-title=\"\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Repro-Claron na Sinaru S 8&amp;#215;10&amp;#8243; s reflexni\u0301m binokula\u0301rni\u0301m hleda\u0301c\u030ckem a pr\u030ci\u0301davny\u0301m me\u030cchem 4&amp;#215;5&amp;#8243;&lt;\/p&gt;\" data-large-file=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/5-Repro-Claron-na-Sinaru-S-8x1022-s-reflexnim-binokularnim-hledackem-a-pridavnym-mechem-4x522-1.webp?fit=1024%2C409&amp;ssl=1\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on--pointerdown=\"actions.preloadImage\" data-wp-on--pointerenter=\"actions.preloadImageWithDelay\" data-wp-on--pointerleave=\"actions.cancelPreload\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/5-Repro-Claron-na-Sinaru-S-8x1022-s-reflexnim-binokularnim-hledackem-a-pridavnym-mechem-4x522-1.webp?resize=1024%2C409&#038;ssl=1\" alt=\"\" class=\"wp-image-658\" srcset=\"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/5-Repro-Claron-na-Sinaru-S-8x1022-s-reflexnim-binokularnim-hledackem-a-pridavnym-mechem-4x522-1.webp?resize=1024%2C409&amp;ssl=1 1024w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/5-Repro-Claron-na-Sinaru-S-8x1022-s-reflexnim-binokularnim-hledackem-a-pridavnym-mechem-4x522-1.webp?resize=300%2C120&amp;ssl=1 300w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/5-Repro-Claron-na-Sinaru-S-8x1022-s-reflexnim-binokularnim-hledackem-a-pridavnym-mechem-4x522-1.webp?resize=150%2C60&amp;ssl=1 150w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/5-Repro-Claron-na-Sinaru-S-8x1022-s-reflexnim-binokularnim-hledackem-a-pridavnym-mechem-4x522-1.webp?resize=768%2C306&amp;ssl=1 768w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/5-Repro-Claron-na-Sinaru-S-8x1022-s-reflexnim-binokularnim-hledackem-a-pridavnym-mechem-4x522-1.webp?resize=1536%2C613&amp;ssl=1 1536w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/5-Repro-Claron-na-Sinaru-S-8x1022-s-reflexnim-binokularnim-hledackem-a-pridavnym-mechem-4x522-1.webp?resize=1200%2C479&amp;ssl=1 1200w, https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/5-Repro-Claron-na-Sinaru-S-8x1022-s-reflexnim-binokularnim-hledackem-a-pridavnym-mechem-4x522-1.webp?w=2000&amp;ssl=1 2000w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\tdata-wp-bind--aria-label=\"state.thisImage.triggerButtonAriaLabel\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.thisImage.buttonRight\"\n\t\t\tdata-wp-style--top=\"state.thisImage.buttonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewbox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><figcaption class=\"wp-element-caption\">Repro-Claron for Sinar S 8x10\" with reflex binocular viewfinder and additional 4x5\" bellows<\/figcaption><\/figure>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>This time we're talking about nothing less than the giant Schneider-Kreuznach Repro-Claron 610mm f9! Only a little over 400 pieces were made and it's especially big, heavy and radioactive. Radio... active? The WHAT?!<\/p>","protected":false},"author":280845872,"featured_media":630,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"slim_seo":{"description":"Designed for graphic arts, adopted by landscape photographers. Can the Repro-Claron become something it was never meant to be?","title":"Schneider-Kreuznach Repro-Claron - Negativ na cest\u00e1ch"},"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[48027083],"tags":[],"class_list":["post-628","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lenses"],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/negativnacestach.cz\/wp-content\/uploads\/2026\/06\/1-1.webp?fit=1600%2C2000&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/phj9fI-a8","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/negativnacestach.cz\/en\/wp-json\/wp\/v2\/posts\/628","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/negativnacestach.cz\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/negativnacestach.cz\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/negativnacestach.cz\/en\/wp-json\/wp\/v2\/users\/280845872"}],"replies":[{"embeddable":true,"href":"https:\/\/negativnacestach.cz\/en\/wp-json\/wp\/v2\/comments?post=628"}],"version-history":[{"count":37,"href":"https:\/\/negativnacestach.cz\/en\/wp-json\/wp\/v2\/posts\/628\/revisions"}],"predecessor-version":[{"id":1670,"href":"https:\/\/negativnacestach.cz\/en\/wp-json\/wp\/v2\/posts\/628\/revisions\/1670"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/negativnacestach.cz\/en\/wp-json\/wp\/v2\/media\/630"}],"wp:attachment":[{"href":"https:\/\/negativnacestach.cz\/en\/wp-json\/wp\/v2\/media?parent=628"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/negativnacestach.cz\/en\/wp-json\/wp\/v2\/categories?post=628"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/negativnacestach.cz\/en\/wp-json\/wp\/v2\/tags?post=628"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}