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The best photos I have taken of lens condition have been when I have placed the lens on a light table and photographed the lens with the light shining through it.
The only drawback is that I don't own a light table.
Fortunately, I know how to improvise one: I set up my phone/tablet/laptop to display a blank (white) page, set the lens down on that device's screen, then take as many photos of the lens as I like. Since I have both hands on the camera, it's easy to frame and focus each picture as desired. The only drawback to this technique is that it requires the use of two devices: one to act as the light table, and one to take the pictures. For example, I use a tablet and a phone.
The only drawback is that I don't own a light table.
Fortunately, I know how to improvise one: I set up my phone/tablet/laptop to display a blank (white) page, set the lens down on that device's screen, then take as many photos of the lens as I like. Since I have both hands on the camera, it's easy to frame and focus each picture as desired. The only drawback to this technique is that it requires the use of two devices: one to act as the light table, and one to take the pictures. For example, I use a tablet and a phone.