Olympus lenses: where is the aperture blade lever?

EarthQuake

Mu-43 Top Veteran
Joined
Sep 30, 2013
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There is no aperture blade lever on native AF M43rds lenses, if you want to check the aperture, mount the lens on a camera, set a long exposure and set the aperture on the camera and look through the lens.

Additionally, I think it would be extremely rare to find a native M43 lens that has oil on the blades, this is typically a defect that shows up after many years of use, 15+ or so generally. So there simply aren't M43rds lenses old enough to really show the problem. Not to say that its impossible, but its unlikely. Oily blades is much more common on vintage manual focuses lenses, where the oil from the focusing helicoid gradually seeps onto the aperture assembly.
 

EarthQuake

Mu-43 Top Veteran
Joined
Sep 30, 2013
Messages
934
Yes and of those only Minolta MA/Sony A mount was a new mount, F and K having existed for decades before autofocus was a thing. Minolta was first to market with an AF system, which wasn't that much different to their existing MD lenses but with a different flange distance/mount and a gear in the lens for the body to focus, which Nikon and Pentax followed with similar implementations, but all three have gone to in-lens AF motors since, like Canon did in the late 80s when they introduced their AF based EOS EF system. Pretty much every AF camera system introduced after 1990 has had both in-lens focus motors and electronically controlled apertures.

Sorry for the tangent, I just think the history of this stuff is interesting.
 

Reflector

Mu-43 Hall of Famer
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Aug 31, 2013
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You can also set aperture preview to a button (Or just do a long exposure) and quickly demount the lens to check the backside blades if needed. It'll be like playing with Canon EF lenses and presetting the apertures.
 
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