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#31
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wrote in message ... In message , I, wrote: Is glare an issue? I guess not, as long as they are illuminated from behind; they are transmission wedges. Actually to get the best results, one should *only* have back-lighting for such dense areas as the target offers. Any light striking it from the front will reduce contrast a little. Of course, if the amount of backlighting is much larger than any ambient light to the front, there is no issue. That means that it's best to shoot the target with the front shielded from ambient light, and the back only lighted by a lightsource that's shielded from lighting anything else than the target. Bart |
#32
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wrote in message ... In message , SNIP That looks interesting. Do you have one? Is glare an issue? I have one from Kodak that covers 10 stops, but that is too limited because the channels are not equally sensitive, which requires combining different exposures to clip on the bright side, and be noise limited by dynamic range on the dark side. I'm in the process of ordering the T4110, and I'm building a dedicated lightbox/contraption with masked opaline glass as a diffusor, and a kind of ambient-light shade on the front. The Imatest software I use will also allow to make sure that the illumination of the target is uniform, and I can measure/calibrate the target (in place) transmission and spectral characteristics with the Eyeone Photo's Spectrophotometer. I'm experimenting with the lightsource to use, but I'll probably either end up with 5300K or 6500K fluorescent tube lighting (which makes it hard to restrict lighting to only the target holder), or a shielded electronic flash rear window. It'll probably be the flash exposure (more consistent/repeatable and shorter exposure times). Bart |
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