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06-24-2007, 07:05 PM   #1
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Sigma 70-300 ld

Found a sigma 70-300 ld zoom lens on a reputable online company for a decent number. How do I know if it fits my K110d? It was under the "Pentax lens" menu.

I have read that this is a decent lens and since I am just learning the trade I might go for it.

Any thoughts appreciated.

06-24-2007, 07:13 PM   #2
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If it's a Pentax K-mount lens, it'll work. The Pentax DSLRs are some of the best out there in terms of lens compatibility, even the oldschool original K and M series (manual aperture, manual focus) from the 1970s work, although anything before the A era is a bit of a pain to use with the K-series DSLRs.

As to reputable online vendor - was it B&H? If it's in one of their Pentax categories, it'll work.

Edit: Was it the LD or APO LD? Both will be compatible, but given the potential differences in image quality I'd go for the more expensive APO or possibly the Tamron 70-300. I'm actually in the middle of deciding between the Sigma APO and the Tamron myself.

Last edited by Entropy; 06-24-2007 at 07:21 PM.
06-24-2007, 11:34 PM   #3
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The APO version of the Sigma is reputed to be better, its also slightly more expensive.

Photozone has tested the two lenses, but not for the same mount, so you cannot directly compare the MTF charts, but it can still be usefull.
Sigma AF 70-300mm f/4-5.6 APO DG macro - Photozone Test Report / Review
Tamron AF 70-300mm f/4-5.6 LD Di macro (Pentax K) - Photozone Review / Test Report

I would not get the sigma, because its not good at 300mm, and if you only use it at 70-200 mm, then its better to get the Pentax 50-200mm and if you really need to use it at 300mm as well then the Tamron seems a better choice. Although neither the Tamron nor the Sigma are great at 300, you just can expect that since they are so cheap. You can get quite good results though, with some good technique and some good PP.

You have to be prepared to PP if you want to use these at 300mm, at least some curves and usm, because the pictures will look very flat and dull and will need some sharpening.

Thats based on my own experience with the sigma 70-300 APO version.
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