![]() M.maybe I really spend the $40 and go for the Edmund's (see also here ). This is 36" x 24", i.e., 91 cm x 61 cm and really looks good to me because it is (i) large and (ii) has a pattern in the corners. Or, even simpler and at almost no cost, why not use the DIY version: print the 1951 USAF chart five times (center + corners) and stick to a wall? I've done all that as well (USAF charts and such). And I use them if I'm curious enough to compare sharpness of several lenses. But with charts, you can pin anything on a wall, the most difficult part is to get the camera properly aligned.
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