>That sounds really awful. Remember the diaphragm has to stop down and
>release every time the shutter fires. Quickly. If there is gunk or
>corrosion on those little individual leaves, the whole diaphragm may have
>to be replaced. I don't know, but it doesn't sound minor to me.
>
>From my personal experience, working on the blades is virtually never a DIY
project even for a highly skilled DIYer. Oil is the usual cause, and it is
usually visible. However, sometimes the linkage to the blades gets gummed up
and can be easily cleaned. I had one Zuiko lens that had oil on the sliding
plate that couples the DOF lever to the diaphragm blade lever causing this
problem.
Doug
>>Hi,
>>
>>I know of an Olympus 35-70 zuiko lens for sale in a shop in Malta, for
>>some $90. It has a problem with the preview button however. Whilst the
>>diaphragm moves normally when you select the separate apertures via the
>>ring, pressing the preview button makes the little protruding 'thing'
>>that moves stay to the 'preview' side. It does not return to its normal
>>position when you release the button, meaning that you are, in practice,
>>always 'depth-of-field' previewing!!! Now, do you think it is worth the
>>money, and can I repair it myself? If not, what price might I try and
>>negotiate? Also is that a normal price for a second hand zuiko 35-70?
>>
>>regards
>>
>>Konrad Pizzuto
>
>Winsor Crosby
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