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02-11-2016, 01:10 PM   #1
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K1000 K-mount issue

Hey guys...I just this morning received a K1000 to add to my Pentax M42 collections. I guess this makes me a K-mount virgin. Anyway, the camera came with two lenses: a Pentax-A 50mm f/2, and a Sigma 100-200mm zoom f/4.5 Macro.

The Sigma mounts right up, twists and locks to the frame of the camera....the 50mm will not. It slots up (lining up the dots) but will not turn at all.

I'm certain there is a trip lever or something inside the lens I need to release somehow, but don't know where to start.

Any help is welcomed!

Thanks,

Sam

02-11-2016, 01:18 PM   #2
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No trip lever in a K- mount. I suspect your lens is damaged. Carefully compare the bayonet end of both lenses, looking for very slight differences.
02-11-2016, 01:47 PM   #3
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QuoteOriginally posted by yosemitesamiam Quote
I'm certain there is a trip lever or something inside the lens I need to release somehow, but don't know where to start.
QuoteOriginally posted by john.margetts Quote
No trip lever in a K- mount.
What he said...

If it will not turn, do not force it. It is very likely that one of the couplings (there are two) is bent out of alignment.


Steve
02-11-2016, 01:55 PM   #4
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Yeah...it does appear (using a 1/100ths metal ruler) that one flange is out of spec with the rest...and with the other lens..hmmm...junk I suppose.

---------- Post added 02-11-2016 at 12:56 PM ----------

QuoteOriginally posted by stevebrot Quote
What he said...

If it will not turn, do not force it. It is very likely that one of the couplings (there are two) is bent out of alignment.


Steve
Oh...two? I was looking at the three flanges...

---------- Post added 02-11-2016 at 01:05 PM ----------

Anyway, safer to count my loses on that particular lens I think. Not certain a 50mm f/2 is worth losing sleep over.

Thanks guys.

02-11-2016, 03:17 PM   #5
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Does the sigma lens require a k-bajonette adapter to be mounted on the body? Maybe it is still connected to the body and this won't allow you to mount the 50mm.
02-11-2016, 03:53 PM   #6
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QuoteOriginally posted by gabro822 Quote
Does the sigma lens require a k-bajonette adapter to be mounted on the body? Maybe it is still connected to the body and this won't allow you to mount the 50mm.
I wish it were that easy. :/

The sigma is made for k mount. The camera is bare camera. I think it's toast.
02-11-2016, 04:30 PM   #7
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Can you post some pictures of the lens and camera's mounts?
02-11-2016, 06:36 PM   #8
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QuoteOriginally posted by gabro822 Quote
Can you post some pictures of the lens and camera's mounts?
Sure thing! Here are a few. One of the camera, one of each lens, and then one front and back of the Pentax lens, as well as the side view (for Pentax K) on the Sigma...

Thanks! It would be great to not have to shop for another lens...!

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02-11-2016, 07:00 PM   #9
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If you're going to trash an A50/2, which can be a fine, sharp normal lens, consider the use of two needle nose pliers and judicious bending of the bad flange. You can't make it worse, I don't think.
02-12-2016, 05:22 AM   #10
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From these pictures, everything seems ok with the lens mount. Does the lens face correctly the camera mount, or is there a little gap? If the problem is just that you can't turn the lens, try to see if is the lens aperture lever that can't be moved or the camera's one. Is the inner plastic bajonette at the same level of the other mount's components (maybe it grip with the mirror and you can't turn). Sorry for real basic advices, but is a really strange problem...
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