Peter De Smidt
Member
I have two Nikon lenses that aren't stopping down, a 20mm AF and a 105 AIS. The lenses don't stop down even when I slid the black lever on the back of the lens. Is this something that can fixed?
New parts are more than likely not needed.
Usually the reason the aperture doesn't move is that lube from the focusing helical has migrated to the housing & is causing the iris to stick to the housing.
The surface tension can't be over ridden from the really light spring used to stop the poor little thing down.
It's a simple(?) Cla to correct
I've had to return my 20/f2.8 back to Nikon three times already in the last 1.5 years for this exact problem. Each time they simply clean and re-lube it. It's been a real disappointment for me. But, I guess as long as it is covered by the 5 year warranty, I have one less thing to complain about.
Good luck.
My opinion is that they are fixing the problem but not the cause. Next time, they need to disassemble the lens completely and replace the lubrication on the helical. This is the source of the oil that is migrating into your iris.
They should know this and coming from a repair background, I expect a lot more from Nikon.
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