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08-23-2007, 03:12 PM   #1
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Sigma 1.4x APO with Pentax Tele Zoom?

I've recently bought a K10D with DA 16-45 and DA 50-200 lenses, and I'm really liking the compression at the long end of the 50-200, and I'd like to augment that further, so I was wondering if anybody has any experience with using the Sigma teleconverters with their Pentax lenses.

Thanks.

08-23-2007, 03:22 PM   #2
roy
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there are models made by sigma that will not work on some lenses. be sure to ck compatibility. IIRC the problem is the sigma's fromt element protrudes outward. kenko and tamron both make good EXs. with the zoom i'd try a 2x before i bought it. to me, the IQ lost with a zoom is usually too much.
08-23-2007, 03:36 PM   #3
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I have the 1.4x TC and use it for the Bigma. It's not compatible with lenses other than Sigma as I am aware. Using a TC on a lens less than 100mm is also not recommended...
08-23-2007, 05:39 PM   #4
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Original Poster
Thanks for the replies.

Sigma's website only lists compatibility with their lenses. I've not had the Sigma 1.4 in my hands, so I'm not sure if the front element protrudes.

Paul. My intention was to use the telconverter only at the long end of my current DA 50-200 (or the DA* 60-250 when it becomes available). Maybe a Sigma 170-500 is in my future as well.

08-23-2007, 05:59 PM   #5
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My Bigma has to be set at the 100mm setting or longer for the TC to even fit the lens because of the protrusion...when I first bought it I didn't read the manual and I couldn't get the TC to go on the lens....I wondered what the heck was wrong!
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