Lens problem w/ K100d super

[tom_smith22]

Used this lens (a Sigma 50mm f/2.8 DG macro) a week ago, worked fine. Now I just

picked it up and it won't work. It was stored mounted onto the camera in a

proper camera case. Lens has never been used apart from a few dozen test/play

around shots.

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The other lens I've got here, a Sigma 18-50mm, works fine. From a visual

inspection, the aperture signal pins on the 50mm 1:2.8 are seemingly stuck in

the 'open' position, in contrast to the 18-50mm, in which the default position

for the pins makes the aperture diaphragm close, and the act of rotating the

lens when you mount it causes the pins to move into the correct place to cause

the diaphragm to open up.

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Pic:

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<IMG SRC="http://img85.imageshack.us/img85/6298/pentaxlensesgy5.jpg">

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The pins on the 50mm are obviously in the wrong place, and will not move at all,

unlike the 18-50mm pins which move when pushed.

This equipment isn't mine, and I'm prepared to buy a new lens for the time being

for the original owner if there is no easy fix to this.

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Thanks, Tom

[tom_smith22]

Okay, for future reference, it helps to have the lens set to 'A' to avoid panic.:D