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I've used them on my 26mm and 32mm plossls. They worked, but I found them a bit of a nuisance. I wound up taking them off and just using my hand instead.
Unfortunately, those long eyeguards are the only ones that work properly with long eye-relief eyepieces. I do use the butterfly ones that come up on one side only in shorter eye-relief eyepieces.
Regards
Renato
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