GoofyNewfie wrote:
Before scanners, I did a ton of copying with slide film where I worked.
Non-glare glass helped a bit (also lost some sharpness), but I found the best solution was to use black posterboard with a hole that fit tightly around the lens, blocking the camera, user and anything else that reflected. We painted the ceiling black in our copyroom.
You may want more than one size, smaller for close-up (this will allow the lights to illuminate what you are copying easier) and bigger to cover the larger area that may be reflected when shooting something larger.
Longer is better, but use at least a "normal' length lens, ie: 35mm for APS-C, 50mm for full-frame. A longer lens will allow you more room to light the subject, reduce the angle of view and what is reflected in the glass.
Polarizers were not necessary.
Before scanners, I did a i ton /i of copying wit... (
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ALL of what GoofyNewfie says is the way it is. You may find that placeing a black sheet on you copy surface will help you track down 'mystery' reflections.
The only thing I might add is that a vacuum platen may be of use. Don't need expensive, a decent DIY rig would work.
And try to limit light spill. Only what you are copyiing needs lisht!