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Canon 5D
The most accurate this lens when I came across it was just a piece of glass about 4.5cm x 7cm in diameter.
no brand, no focus, no aperture, no mount to connect...
I was curious, trying to assemble it into a simple lens to connect the camera and take a test shot...
And the result is this... Please comment on its photo and look forward to sharing technical knowledge with those of you who have similar interests.