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MTO 500mm f8 M42 – 3W-5CA – how to test the quality ?
MTO 500mm f8 M42 - 3W-5CA - how to test the quality ? Hello I took an MTO 500mm f8 produced by LZOS in the 92 (by serial number indication) for 60€ sold by RCE Foto and by pictures that i saw looks in very good conditions. but when it arrives, how can I check the sharpness? should I use a sheet of paper to print so I can do the test ? https://i.imgur.com/QGuMZnSl.png can you link me a better one ma...
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