Originally Posted by peri24
Is your 90mm WA Congo multicoated, or the older, more common single coated version? I have the multicoated version and find the colors and contrast excellent. It's not a very good scan, but here's a shot made with this lens:
My multicoated version has a 43mm front filter thread (but I use it with 52mm filters with a 43mm-52mm step-up ring).
The rated image circle of 175mm seems pretty accurate in my experience. Beyond that, coverage is limited by mechanical vignetting.
Of course, the best thing about this lens is the absolutely tiny size and ultralight weight. This makes it a great lens for backpacking - which is what I use it for.
Really Big Cameras