A Question for Macro Togs

Does this depend on the lens used and/or the shooting distance?

Only asking because I just tried mine for an 1:1 magnification photo and the illumination looks perfect (to my eyes!).

It's the distance rather than strictly the magnification.
 
Does this depend on the lens used and/or the shooting distance?

Only asking because I just tried mine for an 1:1 magnification photo and the illumination looks perfect (to my eyes!).

It does depend on the shooting distance (the ring is really wide after all). From experience 100mm on 1.6x at 1:1 starts to suffer from this. However 180mm on crop *may be* good. I believe ebay replica rings are a little smaller.
 
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