The Kaiser 57mm Push-On Lens Cap is designed to fit any camera, enlarger lens, binocular, tele-, micro-, or spotting scope lens. It is for lenses having a front or rear ring with an outside diameter of 57mm. The cap should fit snuggly but not so tight that it is hard to remove.
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I ordered this Kaiser cap and another (Sensei), suspecting there would be minute differences in the fit on a small macro extender lens. The Kaiser is slightly snugger, but more importantly it feels a bit more substantial, with no flex in the plastic at all. Definitely worth the significantly higher price for the peace of mind.
Fits snugly on the lens I wanted to protect.