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09-04-2011, 01:20 PM   #1
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Is this a Pentax or Sigma Mount?

I am thinking it looks like a Pentax mount, but I can't quite be sure. Any of you know?

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09-04-2011, 01:34 PM   #2
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It's a Pentax mount, even has the orange mounting dot.
09-04-2011, 01:49 PM   #3
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Yep, looks like a K mount lens from that image. Try it out on your camera to know for sure whether it'll work or not.
09-04-2011, 01:55 PM   #4
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Thanks! The problem is I don't have it to try, I'm looking at buying it and they don't allow returns and they don't say what mount it's for so I want to be sure. Here are the other two pictures of it. I pulled out my it lens and compared and all the pins are the same except the kit lens has a flat pin in the space between the two rounded ones in the upper right, so I'm not sure what that is for

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09-04-2011, 02:54 PM   #5
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Sigma SA mount - Wikipedia, the free encyclopedia

The Sigma SA mount is based on the PK mount, but with a shorter register (44mm vs 45.46mm) and slightly larger bore. I haven't seen any SA lenses so I don't know if the contacts and drive screw are the same as KAF (which Sigma might label KPR). I look at my only AF Sigma, a 170-500, and the base and aperture ring look the same as in your photos. So yours is very likely a Pentax mount -- but I can't be 100% sure. Good luck!
09-04-2011, 02:59 PM   #6
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The contacts on a Sigma mount lens are the same as a Canon EF. That is a PK mount lens.
09-04-2011, 04:07 PM   #7
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Thanks all! I just bought it, fingers crossed
09-04-2011, 04:35 PM   #8
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Does the Sigma mount even have a mechanical aperture coupling? I thought it was electronic, unless there is an earlier version of it that I'm unaware of.

09-04-2011, 04:55 PM   #9
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I have a very similar model of Sigma lens, slightly smaller max aperture, black instead of silver, but otherwise looks identical. It's a Pentax mount, as others have assured you.
09-04-2011, 06:09 PM   #10
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QuoteOriginally posted by pdxfive Quote
Thanks all! I just bought it, fingers crossed
Hope you got winner, it looks very clean, there are a lot of lenses out there that are barely used. People got SLRs and didn't want to take the tiome to learn how to use them and put them in the closet.
09-04-2011, 10:46 PM   #11
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Hope it works as good as it looks! I was able to pick it up for around $45 so I think I got a pretty good deal
09-08-2011, 06:32 PM   #12
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Just came in the mail today, and it works great! Autofocus is a bit slower than the kit lenses but still acceptable. The thing is like a brick though! Weighs noticably more than even the 55-300 kit lens, that'll take some getting used to, but I think it will come in handy not having to change lenses so much. Thanks again everyone for your help
09-08-2011, 07:35 PM   #13
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Glad to hear it worked out! It should be a good lens, considering the lesser version I have has its moments. The one you have still has a 72mm thread, right? That explains the weight to some extent, I think - it has a lot of glass in there.
09-09-2011, 12:52 AM   #14
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Yup it's a 72mm, definitely overshadows the camera a bit
09-09-2011, 05:26 AM   #15
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It overshadows the pop-up flash as well. I think you'd need some kind of basic reflector or snoot to use it with this lens at 200mm.

That said, I still LOVE lenses with a wide front element like this. Good luck with it.
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