u/Informal-Double-1647

Can someone who has a 28mm 2.8 post a function test on the blades returning after releasing the button.

I have two of these one I just acquired today from eBay and one from marketplace a few months ago. Both blades are slow to return or don’t until I move to a different aperture(neither have oil on them, so I’m guessing missing spring). Unlike my 3.5 which instantly returns.

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