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Old Jul 31, 2006, 8:17 AM   #1
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I recently aquired a Pentax ist Ds digital SLR camera, with 2 Macro lenses, a 50mm pentax and a 90mm Tamron. These lenses operate fine.

As i have had a Pentax film SLR previously, I wanted to use my ( 3rd party ) K mount zoom lenses. I checked on numerous websites that the ist Ds SLR will accomodate older K mount lenses with no problem. Even Pentax themselves say so. This is where MY problems began! Upon fitting the lens onto the camera body, I found the lens would not turn fully to its"clicked in" position. So, not being prepared to use any force, i backed the lens off, deciding to (try) and remove the lens. Well, the lens now refuses to undo, as if something was interfering with the mounting as it is turned. The lens will only move back and forth about 3 or 4mm, and just refuses to rotate to the releasing position !. I do not want to use force as this will get me nowhere.

The camera is almost brand new, and I was looking forward to using it very much. I just hope someone can help me , as I cant think what is "jamming" this lens.

The lens, by the way is an Astron 35-75mm with Auto aperture "A" setting..sold with my original "program A" Pentax SLR. H E L P !!

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Old Jul 31, 2006, 8:52 AM   #2
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Check out this thread. This should help you.

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Old Aug 2, 2006, 5:41 AM   #3
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others who have had this problem need to respond
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Old Aug 2, 2006, 6:13 AM   #4
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If you take the time to follow the above thread you will find:

"I put an old 135/2.8 KA/R lens on the D just now and 1/2 way it got stuck!
Had a devil of a time getting it off.
Had to take a thin piece of plastic and slide it in between to release the
stupid Ricoh contact from where it was firmly stuck in the little hole for
the autofocus drive pin!
That little Ricoh pin no longer exists, thanks to my trusty Dremel tool!
Just a word of caution to those of you who haven't tried this."
Ricoh mount lneses are not true K mount lenses and are a PITA and are usually
more trouble than they are worth since most of them are not very high quality
lenses anyway.

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Old Aug 2, 2006, 8:54 AM   #5
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Here is a post I contributed to DPReview a while ago... hope this helps.
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