Daniel D. Teoli Jr. Posted February 2, 2022 Share Posted February 2, 2022 (edited) Thorlabs make some nice targets of many designs. Positive and negative. Only issue is they are pricey. This one is a negative target for backlight use. It is a small target about 2x2 inches. Max Levy also makes resolution targets. Resolution Test Targets: II-VI Aerospace & Defense (maxlevy.com) What type of target do you use for lens tests? Edited February 2, 2022 by Daniel D. Teoli Jr. Link to comment Share on other sites More sharing options...
Premium Member Phil Rhodes Posted February 2, 2022 Premium Member Share Posted February 2, 2022 I just print 'em. Not so much of an issue with colour accuracy with a resolution target, and the dimensions are reasonably accurate. Link to comment Share on other sites More sharing options...
Daniel D. Teoli Jr. Posted February 2, 2022 Author Share Posted February 2, 2022 You gotta be careful with some of these targets Phil. Some are not good for hi-res tests if you are using for scanner use. Here is one at B&H for 1/2 the price of the Thor target. Here is one of the reviews for this target... Good Low Cost Resolution Target - but 3/1/2015 By null I purchased this product to evaluate my Epson R2400 scanner resolution. Before I scanned the Resolution Target I examined it under a microscope to provide a reference for the practical resolution range this target can produce. The microscope images show that the target has a significant amount of grain and the smallest resolving area of the target is under Grooup 6 with lots of grain. You can successfully evaluate a scanner with at best 5000 dpi. Group 7 is completely useless. So, if you are attempting to evaluate a scanner that is capable of 8000 dpi then this product is useless. For my Epson scanner the target served its intended purpose. Link to comment Share on other sites More sharing options...
Premium Member Phil Rhodes Posted February 3, 2022 Premium Member Share Posted February 3, 2022 Ah, we're talking about test targets for scanners, my mistake. Yes, buy those. Link to comment Share on other sites More sharing options...
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