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Preview and taking stop-down: problem?

Googlyelmo

Seattle, US
113 posts

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Googlyelmo Registered since 10th Oct 2012
Sun 17-Mar-13 05:38 AM | edited Sun 17-Mar-13 06:33 AM by Googlyelmo

The lovely F4 I have been posting about may have a serious problem.

I don't know why I was even fiddling with it, but I noticed the aperture (several lens, inc. AF 50/1.4D and AF 24-50/3.3-4.5) Dont seem to stop down farther than F8 when I operate the preview lever. As I move the aperture ring, it closes to F8, then doesn't seem to move. Off the camera, or on my D7K digital, the lens does as I expect. Also, looking into the mirror box with no lens mounted, the stop-down lever only travels slightly more than half its length (I know that will vary according the smallest aperture of the lens mounted, but my D7K lever moves to the bottom of its range). No evidence of over-exposure on the photographs (if anything, slightly under exposed). When I received the F4 the preview lever was sticky, wouldn't always return when released, but applied a little alcohol and it returns as normal now. So I am wondering if I even have a problem (maybe I am mistaken about how the lever on the F4 is suppose to operate, and if so, what to do. Any tests to recommend? Alcohol on the stop-down lever, other simple home fixes, or to the camera doctor? Thanks.

--Will

EDIT: I should have mentioned that I set the shutter to 2 sec and F8, then F16, and it also appeared not to stop down fully at the smaller aperture. Tried this twice, and again with a second lens, same thing.

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