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Hay Ice , zooming in on some cameras is not the best choice as far getting minimal vigneting.
For example on my Minolta D7 digital it has the equivalent of a 28-200mm lens and the only FR that works with minimal vignetting is at about 45mm equivalent not 200mm -- full zoom .
If i go over or under I get the drain pipe effect and that is with a modified 2" eyepiece and only a 1mm air gap between EP and camera.
It depends on how the lens groups are arranged and move on certain cameras, and it is best to try different settings.
Mark
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