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05-31-2012, 12:47 AM   #1
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Pentak 55-300mm VS Sigma 70-300mm

Hi guys,

i am considering buying a new zoom lens for my K5. Right now i cant decide between:

Pentax 55-300mm
or the
Sigma 70-300mm.

Both seem to be getting good reviews..

Which one would you prefer, or are there other lenses in this price range which are superior to those mentioned?

05-31-2012, 05:55 AM   #2
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I believe the Sigma is quite a bit heavier, and most copies can go 1:2 for closeups. I tried 70-300 and 100-300 lenses but the range of the 55-300 wins for me - and its IQ is dependably good. You can find many threads on this topic here, I'm too sleepless to look them up for you - but they are here!
05-31-2012, 05:57 AM   #3
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Yeah i already have read some of those thread since starting this thread.. right now i am leaning towards the 55-300. There is just so much positive feedback on that lens..

Most of the other 70-300 (Tamron / Sigma) get mixed reviews on this board..
05-31-2012, 07:02 AM   #4
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Sigma 70-300mm


I have the Sigma which is quite ok but I'll get the Pentax for two reasons:

1. The Pentax is smaller and lighter

2. Quality is better on the long end

The macro feature on the Sigma is nice but I hardly use it. Now, the big difference is in the price. If you are on a tight budget i'll go for the Sigma. It can be found around 100-120$ second hand and the quality is very good until 210-220mm. Then, sharpness and contrast drops.
The Pentax can't be found under 250$ on second hand (except for the DAL version). So, up to you.

05-31-2012, 11:33 AM   #5
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In addition to everything already said: While the Pentax probably does offer equal/better overall IQ, the Sigma is far superior in eliminating purple fringing and chromatic abberations. This is of course if you are talking about the APO version. Even the non APO versions are pretty good, and can be found for far less than either of the others. I don't knock the Pentax in any way, but I'm not sure if it's worth the extra money.
05-31-2012, 12:40 PM   #6
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I had the APO version of the Sigma and I didn't really like it. IQ was good, but it felt diabolically poorly made. Zoom ring was super stiff, focus ring felt incredibly loose, front element rotated on focusing, plastic felt weird and finally, that stupid rear cap...

It put me off Sigmas, but I hope to get a more upmarket Sigma in the future at some point, as they are fantastic lenses. I'd go for the Pentax simply because the build will be much better. And it has quick shift if I'm not mistaken, which is the most amazing thing ever in my opinon.

Last edited by Mareket; 05-31-2012 at 02:21 PM.
05-31-2012, 01:47 PM   #7
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I have the Sigma and I hate it, really bad IQ get the Pentax much better.
05-31-2012, 01:57 PM   #8
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I have had a couple (non APO) Sigmas and they can't come close to the DA 55-300. Also the DA55-300 has quick shift which can tremendously help the noisy focus. Get the DA55-300.

06-01-2012, 08:59 AM   #9
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I own an APO Sigma and I find it okay. But the biggest thing to consider first is your budget. If you can afford the Pentax then get it. It is better at the long end and smaller then the Sigma. However if the Pentax is going to be too expensive then get the Sigma you will not be disappointed. As for quick shift it only is available on the DA model and not the DAL version be careful as both can be purchased optically they are the same.

I find my Sigma not used too often but that is because the focal length isn't what I usually need.
06-02-2012, 07:50 AM   #10
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The Sigma has quasi macro, front element rotates on focus and the zoom ring needs to be turned opposite to the way Pentax lenses go (based on Canon's way). The Pentax DA has the quick focus and fixed front element. Minimum focus distance is about 1.4m, however the Sigma is probably more of a compromise as it tries to be a macro as well. Note that the Sigma is also full frame, so using it on APC gets into it's sweet spot.

Last edited by Timd; 06-03-2012 at 11:54 AM.
06-03-2012, 11:55 PM   #11
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I have a copy of each of the 70-300's, and would without hesitation recommend the Pentax. It has significantly better all-round performance, and few flaws. I would recommend the DA for the quick-shift focus. The Tamron and Sigma (my APO is the slightly older model) both have good points, but also several weak points.

I think the only other lens to think about in this class range is the new Tamron SP 70-300, but I don't know if this is available in K mount yet. Reviews and opinions have been very favourable.

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