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sigma 50-150 /pentax da*50-135

reso
Posted 14/07/2020 - 20:50 Link
how does the sigma compare to the pentax
k5iis sigma 8-16 pentax da 12-24 tamron 17-50 pentax faj 18-35 pentax da 18-135 tokina 20-35 tokina 28-70 atx pro pentax dfa 100 wr
pentax da*50-135 pentax da*60-250 sigma af 400mm pentax 1.7 af adapter
Pentax af aw 1.4 rear converter and a flash
JAK
Posted 14/07/2020 - 20:59 Link
I've never used either, but isn't the Pentax one renowned for SDM failures? Which is the main reason I resisted buying one!
John K
reso
Posted 14/07/2020 - 21:03 Link
yes i have had two both ok but always the risk of failure
k5iis sigma 8-16 pentax da 12-24 tamron 17-50 pentax faj 18-35 pentax da 18-135 tokina 20-35 tokina 28-70 atx pro pentax dfa 100 wr
pentax da*50-135 pentax da*60-250 sigma af 400mm pentax 1.7 af adapter
Pentax af aw 1.4 rear converter and a flash
AlJones2402
Posted 14/07/2020 - 23:47 Link
I had a sigma 50-150 and rate it very highly, sharp and very capable lens. Can't compare with the pentax sorry as I've never owned one.

Hope this helps.
carmagw
Posted 15/07/2020 - 10:03 Link
Iíve had both.

Sigma very fast AF (compared to Pentax), sharp ,slightly cooler colours. No weather sealing but never had problems. The out of focus areas were not as smooth as the Pentax and could look rather messy with the wrong background. I could use the Sigma for running events with individuals coming towards me, I could not do this with the Pentax as I would miss too many spontaneous moments due to AF. Now use Nikon for these events and sold the Sigma to reduce my lens collection. Sigma has slightly longer reach.

Pentax, moderate af - found it annoying when I was trying to focus on My kids coming towards me or running events as above. Love the colours and out of focus areas, sharp as well. Weather sealed. Something about the pentax that I love, portraits looked better to me, colours/rendering.

Iíve kept the Pentax although it doesn't come out very often, never had SDM problems with it but did convert to screw drive to see if AF speed improved, may have done slightly but converted it back to sdm as preferred silent AF. Prefer feel of the pentax in the hand (from memory slightly bigger (especially with hood) and heavier.

If I was shooting one system I would have kept the sigma as well for the times a faster AF was needed.

Regards
Mike-P
Posted 15/07/2020 - 15:00 Link
Have had both multiple times, ended up keeping the Pentax.

Sigma has fast af, HSM is better than SDM and it's sharp at f/2.8. Pentax has slow AF, SDM isn't as good as HSM, it's WR and it's very very sharp at f/2.8. It also renders much better than the Sigma.

Not sure it's me but on every Sigma I have had (not just the 50-150mm) you can set up the focusing on the Pentax body and it will be absolutely spot on. Go to use it the next day and it's slightly out. Really Really annoying.
redbusa99
Posted 15/07/2020 - 16:30 Link
i have the Sigma and find it a very good lens but on a personal note i struggle to find much variety of subjects to use it with. went for it over the Pentax due to the bad SDM record it has, downside to the Sigma is that Sigma no longer support the lens so will not repair it shoud it go wrong, whether a third party would be able to repair i don't know.
odd lens or 2

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redbusa99
Posted 15/07/2020 - 16:32 Link
odd lens or 2

Flickr
reso
Posted 15/07/2020 - 19:28 Link
Thank for all the post,s now to decide
k5iis sigma 8-16 pentax da 12-24 tamron 17-50 pentax faj 18-35 pentax da 18-135 tokina 20-35 tokina 28-70 atx pro pentax dfa 100 wr
pentax da*50-135 pentax da*60-250 sigma af 400mm pentax 1.7 af adapter
Pentax af aw 1.4 rear converter and a flash
Edited by reso: 15/07/2020 - 19:30
mr.mellow
Posted 16/07/2020 - 09:44 Link
Iíve had the Pentax 50mm-135mm lens since 2007 and never had a problem with the SDM. Last used it on the 14/7/20 and still very happy with it. Sigma did repair my 120mm-400mm HSM lens when the HSM failed, Sigma did not make the lens at the time but had the spares for it. The cost was about £125 for a new HSM and service.
The older I get the faster I was.
Dave
K-3 II, K10D, DA16-85, DA*50-135, DA12-24, DA18-55, DA 50, Sigma EX DG 70mm Macro, Sigma 70-300mm, Sigma DG 120-400mm APO HSM.
Metz 58 AF-1.

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Nigelk
Posted 17/07/2020 - 11:28 Link
Sadly I can't compare the two. I have the Pentax and consider it a truly lovely lens worthy of its *. I bought secondhand some years ago and so far not had any SDM problems with this lens. Its speed of focusing is leisurely by modern standards maybe but, reliable in my experience.
Edited by Nigelk: 17/07/2020 - 11:29
fatspider
Posted 17/07/2020 - 12:36 Link
I think the SDM issues are hit and miss anyway, I had the 16-50 and 50-135 since 07 or 08 and never had any issues, I dropped my K10D with the 16-50 about 3-4 years ago and the insurance replaced them both despite the lens seeming OK, Unfortunately the replacement 16-50 went belly up in warranty and again about 6 month out of waranty, I converted it to screw drive and found it much faster than SDM, with scaling down my kit the 16-50 has now gone but the 50-135 remains for the moment without problems (finds wood to touch), I can't comment on the Sigma but I'd rate the 50-135 as one of the best lenses I've ever owned, the focus is slow but if I was bothered about speedy AF I'd have bought Canon or Nikon (sorry about the foul language)
My Names Alan, and I'm a lensaholic.
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Edited by fatspider: 17/07/2020 - 12:40
fatspider
Posted 17/07/2020 - 12:41 Link
Pentax 50-135

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My Names Alan, and I'm a lensaholic.
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cardiffgareth
Posted 20/07/2020 - 09:35 Link
I've had the Pentax and found the AF not fast but it was sharp and rendered lovely. Never had SDM issues with it. I suppose it depends on what you're shooting
Gareth Williams ARPS

My outfit: K1ii - Pentax D FA 24-70mm f2.8 - Pentax DA* 300mm f4 - Pentax modified DA* 60-250mm f4 - Irix 15mm Firefly - Pentax FA 35mm - FA 50mm f1.4 - Tamron SP 90mm macro - Pentax AF 540 FGZ II

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