QUOTE(chiggy @ Feb 4 2009, 02:43 PM)
ok, after opening the lens up to the rear element (got stuck there), I notice that the handle that moves the aperture blade is loose. It is supposed to be light that.
the handle I mean is the handle on the left side just after the spring. It is directly across the red arrow.
How loose? Well, if move the lens, the handle will move on its own
Anyway, here is the story
Yesterday when focusing, it was a bit quite tight at one area (aperture ring/blade still works). So I move it back a little, then at the tight area, I use some strength and it budges. Then it is smooth focusing again. Then today, I notice that the aperture blades no longer moves. Could this still be oily blades? From the looks of it, I don't think that the aperture blades is at wide open after all. At least F4 to F5.6
Hmm... sounds more like some linkage or gearing had broken or loosen. This is not caused by oily aperture blades. Why? Because oily blades will initially cause the aperture blades to move sluggishly. But since this is an M42 lens, I would suspect you do not have automatic control of the aperture (meaning you need to manually close down the aperture if you want a lower f-stop), so you will not notice this in your normal use of the lens. Heck, in fact, it probably wouldn't even matter!» Click to show Spoiler - click again to hide... «
the handle I mean is the handle on the left side just after the spring. It is directly across the red arrow.
How loose? Well, if move the lens, the handle will move on its own
Anyway, here is the story
Yesterday when focusing, it was a bit quite tight at one area (aperture ring/blade still works). So I move it back a little, then at the tight area, I use some strength and it budges. Then it is smooth focusing again. Then today, I notice that the aperture blades no longer moves. Could this still be oily blades? From the looks of it, I don't think that the aperture blades is at wide open after all. At least F4 to F5.6
But from your description of your problem, it sounds very much like a mechanical failure rather than an oily aperture blade problem. I would suggest sending it in for repair. If it is too expensive to repair due to unavailability of spare parts, then hunt for a fungus infected (but still mechanically functional) unit on eBay for cheap, and savage the parts for repair. Either way, there is nothing you can do to revive it for now.
Feb 4 2009, 03:01 PM


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