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05-23-2011, 10:42 AM   #1
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my old DA 50-200mm lens not work

Hi Everyone,
My old 50-200mm lens was with my old K10D 4 or 5 years ago, Now Use my K-7 use it since.
Today I put 50-200mm on my K-7 but I see viewfinder is black and AF is not work. I was worry about my K-7 but K-7 work fine with my other lens prime.
Why 50-200mm lens not work. it dead. How can i do it? or whatever?

05-23-2011, 11:37 AM   #2
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If the viewfinder is dark, there are two possibilities:

1. the aperture mechanism is stuck / broken so the lens is staying fully stopped rather than opening when mounter


2. you forgot to take the lens cap off

Assuming it's not #2, you can test #1 by taking the lens off and looking through it as you work the level with your finger - do you see the aperture blades opening and closing?
05-23-2011, 12:47 PM   #3
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No cap on it. Smile

50-200mm lens won't work AF and little dark in viewfinder.. I think it broke inside lens and no good. My other lenses are work fine.
05-23-2011, 01:18 PM   #4
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So are you suggesting that you have tried working the little mechanism on the lens mount and the aperture does not open and close?

If you end up needing to replace the lens, do yourself (and forum members) a favor and just find a good price for the Pentax DAL 55-300mm and consider the matter closed.


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