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Gemstones, Minerals & Fossils
Gemstones and Minerals
Gemstone Photography - Technical Topic
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<blockquote data-quote="Mr Magoo" data-source="post: 461721" data-attributes="member: 3008"><p>Thanks SinHof. Didn't see your post there. Probably pecking out my post at the time. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> </p><p>I had another play with the same stone again this arvo. This time rotating the polarizer through 30* then taking a shot and repeat to end up with 4 shots and a fifth with no filter.</p><p></p><p>On maximum polarization (?) I would have to increase the exposure time. I guess because of a lot of reflected light is cut out. The colour was a lot deeper but facets that were still showing glare/reflection (high lights?) became brighter. So the contrast between the deep colour and the high lights actually made it look worse.</p><p>This explains why a few of the facets in the bottom photo have more glare on them. It wasn't because I had moved a reflector, I guess it was because the exposure had been increased.</p><p>So SinHof there could be a big difference but I'm not sure it's better. :/ </p><p></p><p>I tried that experiment above a few times, the stone in slightly different positions and varying the amount of light from above and each time the wife picked (with out knowing what was what) the image with only minimal polarization. </p><p>I don't think that image above could of taken anymore without making it to contrasty. I was being overly critical of the shot but still feel I should of explored it a bit more.</p><p></p><p>An interesting experiment. I'd love to see how you guys handle it. :Y:</p></blockquote><p></p>
[QUOTE="Mr Magoo, post: 461721, member: 3008"] Thanks SinHof. Didn't see your post there. Probably pecking out my post at the time. :D I had another play with the same stone again this arvo. This time rotating the polarizer through 30* then taking a shot and repeat to end up with 4 shots and a fifth with no filter. On maximum polarization (?) I would have to increase the exposure time. I guess because of a lot of reflected light is cut out. The colour was a lot deeper but facets that were still showing glare/reflection (high lights?) became brighter. So the contrast between the deep colour and the high lights actually made it look worse. This explains why a few of the facets in the bottom photo have more glare on them. It wasn't because I had moved a reflector, I guess it was because the exposure had been increased. So SinHof there could be a big difference but I'm not sure it's better. :/ I tried that experiment above a few times, the stone in slightly different positions and varying the amount of light from above and each time the wife picked (with out knowing what was what) the image with only minimal polarization. I don't think that image above could of taken anymore without making it to contrasty. I was being overly critical of the shot but still feel I should of explored it a bit more. An interesting experiment. I'd love to see how you guys handle it. :Y: [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Gemstone Photography - Technical Topic
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