As others have said, the aperture of the macro lens is jammed. Oil on the
blades/mechanism is extremely rare in this model, and there's no sign of it
in your image. What does sometimes happen is that a lever in the diaphragm's
mechanism wears out -- only replacement of the lever will correct this
problem. After that, it's anyone's guess -- but it is probably worth fixing.
For the 28mm, first you'll need to remove the filter from the front of the
lens. It could be that the filter is "cross threaded" -- look at the
filter/front ring of the lens from the side and see if they are parallel to
each other. If not, if one side is lower than the other, write and I'll give
you some tricks to unjam them. Equally, if there is any sign that the rings
aren't perfectly round, write and I'll pass along some suggestions to solve
that problem.
On some filters you can unscrew the retaining ring inside the front of the
filter ring and remove the glass -- that is, if the filter rings aren't
bent. At best, doing this may remove enough stress on the filter ring that
it will unscrew easily. If not, it reduces the chance that flying glass will
cause any trouble should you have to put undue pressure on it.
Once the filter has been unscrewed from the front rings of the lens, you can
proceed with reassembly -- including the detent ball that's missing!
Nils Frohberg wrote:
> hi!
>
> here goes my first post to this amazingly active list!
>
> i got a few new lenses from my dad a short while ago, and i have a few
> slight problems with the 50/3.5 macro and the 28/3.5:
>
> first, in the 50mm, somehow the shutter must have gotten stuck. i put
> two pictures up at http://www.nils-frohberg.de/oly/PIC00009.JPG and
> http://www.nils-frohberg.de/oly/PIC00010.JPG (sorry, they're still quite
> big since i didn't have the opportunity to scale them down and i really
> didn't think about putting the C1400-L to a lower quality setting). is
> there anything that can be done? at a store they told me it ain't worth
> repairing since it's a 50mm lens and so it isn't worth much. but i sure
> would like to use the lens once or twice before i give up :)
>
> on the 28mm i only have a slight problem. i got it with a 1A filter on,
> which obviously wasn't removed for ages, since it is stuck so hard onto
> the lens, that parts of the lens are unscrewed if i try to unscrew the
> filter (as can be seen in http://www.nils-frohberg.de/oly/PIC00011.JPG
> and http://www.nils-frohberg.de/oly/PIC00012.JPG). i simply didn't watch
> out the first time (never thought something like this could happen), and
> i accidently unscrewed the part which holds the aperture-settings ring
> down, and i can get it on quite tight again, but not as it was
> previously (resulting in a much smoother setting of the aperture, since
> now it doesn't lock into the 3.5, 5.6, 8, 11, 16 settings). any hints on
> how to solve this?
>
> btw, i really enjoyed all the TOPE up to now. the night before
> yesterday's, a huge thunder passed right besides me (lightening struck
> almost all 2-3s), so i was able to pass two rolls of film thru my OM2
> and my OM1 (with a broken light meter :/). it was my first
> storm-shooting, but if the pictures turn out good, i'll get upset with
> the weather-man for delaying that thunder right past the TOPE
> shooting-period :)
>
> thanks,
> --nils
>
> --
> Nils Frohberg
> GPG Key: email nilsf@xxxxxxx with Subject: GET GPG KEY
> GPG Key: http://www.nils-frohberg.de/gpgpub.txt
>
> "The truth is, that those who have never entered upon scientific pursuits
> know not a tithe about the poetry by which they are surrounded."
> -- Herbert Spencer
>
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