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07-20-2020, 08:19 AM   #16
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I have read mixed reviews of the 20-40mm but it remains near the very top of my "wanted" list as I love the Limited primes and something with that focal range would suit most of what I do All I've read about the Sigma, before coming to this thread, is the problems in focusing, which when combined with the perhaps not class-leading AF from Pentax, puts me off. Personally I think the size, weight and limited zoom range are too high a price to pay to make a lens that fast. I prefer to switch to a prime if I need something faster than f/2.8 or f/4.

The Tamron 17-50/2.8 is a very good lens with impressive sharpness even wide open at all focal lengths - said the guy who got a good copy. I know many others didn't get so good a copy and have problems. In my case I only sold it when I got the Sigma equivalent, and you can read about the pros and cons of each in my review of the Sigma. For a lower price, less weight and a more useful focal range, I think 17-50mm is a better choice than 18-35mm. Yes, the Pentax also has only a 2x focal range, but it's not huge, is weather resistant and is a Limited lens.

07-20-2020, 08:22 AM   #17
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I do not have the Sigma, but I do have the 20-40, and I really like it. In typical Limited fashion, it handles and renders beautifully. I'll often grab it and my 15 Limited for the wider stuff and my 55-300 PLM for the far end. That makes a really sweet walkabout kit in my world with my K-3 II. I have several Sigma lenses, which I like, but I think I prefer the color rendering from my Pentax lenses. A little warmer feel. I'd check out sample photos from both lenses and see what you like:

Pentax Camera & Lens Sample Photo Search Engine - PentaxForums.com

Obviously, if you need absolute speed, the Sigma wins, but from what you write, that may not be that big of an issue. Would you like WR? Then a nudge to the 20-40.
07-20-2020, 09:17 AM   #18
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QuoteOriginally posted by Jonathan Mac Quote
The Tamron 17-50/2.8 is a very good lens with impressive sharpness even wide open at all focal lengths - said the guy who got a good copy.
Our copy is good but inconsistent. I tried to include it in test group one day and it simply wouldn't perform and I couldn't figure out why. The next day it was back to normal.
07-20-2020, 12:55 PM - 1 Like   #19
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After long debate with myself, I am settling for the Pentax 20-40mm. I really wouldn't use the 18-24mm range at a wider than 2.8. Its just so much glass to carry around and it would surely give me lot more knots and upper back pain (issue that I have when continuously holding heavy stuff). Unfortunately, my favorite lens, the fa 43mm has the focus ring jammed. I will either have to send it for repairs or sell as is and may end up with the HD 40mm f2.8 one day. Focusing issue is another factor as I had a hard time dealing with my Tamron 17-50mm front/back focusing. Pentax 20-40mm image quality based on sharpness and contrast seems top notch from what I have read between f5.6 to f8 and hopefully has good color rendition.

07-20-2020, 01:46 PM   #20
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QuoteOriginally posted by AH11 Quote
After long debate with myself, I am settling for the Pentax 20-40mm. I really wouldn't use the 18-24mm range at a wider than 2.8. Its just so much glass to carry around and it would surely give me lot more knots and upper back pain (issue that I have when continuously holding heavy stuff). Unfortunately, my favorite lens, the fa 43mm has the focus ring jammed. I will either have to send it for repairs or sell as is and may end up with the HD 40mm f2.8 one day. Focusing issue is another factor as I had a hard time dealing with my Tamron 17-50mm front/back focusing. Pentax 20-40mm image quality based on sharpness and contrast seems top notch from what I have read between f5.6 to f8 and hopefully has good color rendition.
My wife has a Tamron 17-50 and we've had the same inconsistency issues. I'd love to buy her one. With the new DFA 21 ltd. and the K-new coming, it may take a while to get to it.
07-20-2020, 02:21 PM   #21
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QuoteOriginally posted by Jonathan Mac Quote
I have read mixed reviews of the 20-40mm but it remains near the very top of my "wanted" list as I love the Limited primes and something with that focal range would suit most of what I do All I've read about the Sigma, before coming to this thread, is the problems in focusing, which when combined with the perhaps not class-leading AF from Pentax, puts me off. Personally I think the size, weight and limited zoom range are too high a price to pay to make a lens that fast. I prefer to switch to a prime if I need something faster than f/2.8 or f/4.

The Tamron 17-50/2.8 is a very good lens with impressive sharpness even wide open at all focal lengths - said the guy who got a good copy. I know many others didn't get so good a copy and have problems. In my case I only sold it when I got the Sigma equivalent, and you can read about the pros and cons of each in my review of the Sigma. For a lower price, less weight and a more useful focal range, I think 17-50mm is a better choice than 18-35mm. Yes, the Pentax also has only a 2x focal range, but it's not huge, is weather resistant and is a Limited lens.
I have both the 20-40mm and the Sigma 17-50mm F2.8 EX DC HSM, that has been mentioned by a few here. I purchased the 17-50 first and really love its sharpness and range, and at f2.8 all I need in a zoom for that range. Think it is worth looking at as well--great reviews on this site as well. Took it to Europe for travel and hiking. Pro's were the sharpness, flexibility, great in good weather (used hood in some nasty rain and worked fine) . I think I learned how to work with zooms on this camera. It may be a bit heavy but have done a few long mileage hikes and with a sling pack not too bad. Then, purchased the 20-40 for another trip to London and very rainy weather this past fall and early winter. Pro's were portability, handling, weather resistance, and the color rendition--feels less clinical as some have mentioned, maybe not as sharp but the colors were different and more vibrant. I also felt like I would work with the colors as a starting point better in Lightroom. They both really are different and solid in their own way. In the end maybe worth borrowing if you can to test them. I have struggled with getting rid of one, but in the end love both .
07-21-2020, 04:48 PM - 1 Like   #22
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QuoteOriginally posted by Gene D Quote
I have both the 20-40mm and the Sigma 17-50mm F2.8 EX DC HSM, that has been mentioned by a few here. I purchased the 17-50 first and really love its sharpness and range, and at f2.8 all I need in a zoom for that range. Think it is worth looking at as well--great reviews on this site as well. Took it to Europe for travel and hiking. Pro's were the sharpness, flexibility, great in good weather (used hood in some nasty rain and worked fine) . I think I learned how to work with zooms on this camera. It may be a bit heavy but have done a few long mileage hikes and with a sling pack not too bad. Then, purchased the 20-40 for another trip to London and very rainy weather this past fall and early winter. Pro's were portability, handling, weather resistance, and the color rendition--feels less clinical as some have mentioned, maybe not as sharp but the colors were different and more vibrant. I also felt like I would work with the colors as a starting point better in Lightroom. They both really are different and solid in their own way. In the end maybe worth borrowing if you can to test them. I have struggled with getting rid of one, but in the end love both .
I have the same combo, and love it. Boils down to when do I need the faster aperture for low light, etc. and when do I need the above advantages of the DA 20-40mm Limited- especially nice on my KP! The very modest price of the Sigma lens together with a good deal on a new 20-40 LTD made the combo an attractive decision for me.
07-22-2020, 10:30 PM - 1 Like   #23
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I use my 20-40 with my 50-135 as a light carry kit with some serious chops.

07-27-2020, 10:00 PM   #24
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I don't understand the concern with lens flare if you're considering purchasing a wide-angle /1.8 lens. A lens like that is for interior in low light, astrophotography, or night landscapes. Not much chance of lens flare in any of those circumstances. Will you be doing many /1.8 landscapes into the afternoon sun? What do you see yourself photographing, to the extent you can predict such things?

I own three Limited lenses (HD 15mm, SMC 21mm, SMC 70mm) and their resistance (inability?) to flare is one of the hallmarks of the Limited series. None of them are my sharpest lenses. though. Sharp enough, sure. But the Limited lenses seem to be about color, flare-resistance, small size, and delightful build quality.

I own a Sigma 1750mm /2.8, and the build quality and sharpness are superb. The HSM auto focusing is wonderful, with the modest annoyance of having to flick TWO switches to "manual" before i can adjust focus. I expect the fit and finish, the tactile "delight" of the Sigma Art lens will be very close to the Limited. My Sigma is very heavy on my K-S2, the 1835 weighs a good bit more, and I can only imagine how heavy the 1835 will feel after even a modest stroll through town.

QuoteOriginally posted by AH11 Quote
Thanks for all the feedback. I am still debating. Image sharpness is important to me overall and I guess the Sigma, based on what I have researched, is the clear winner by far, right? But it sure is heavy and flare can be a major drawback. I suppose I can live with the flare and just have to adapt. Plus the Pentax at 40mm can only go to f4. But I can also live with that. Just have to change to my prime lenses when in need of f2.8 or lower.
07-27-2020, 10:37 PM   #25
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Did someone say sigma lens flare? was worried about my sensor with this one.


eeking out low light? f/1.8 1/90 3200


need every bit of rust shown?


If not the 20-40 will do it smaller, lighter, in the rain and will probably be with you where the sigma won't.
07-27-2020, 11:08 PM   #26
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I owned the Sigma 18-35/1.8 | Art for a few months. Impressive sharpness, AF was okay on K-5 IIs and K-3, a bit bulky and heavy. The background bokeh was often "busy", when structured smaller things like leafs were only a bit blurred. You see onion-type rings on each light circle, depending on focal length, blurring, local contrast. A special lens in my eyes.

For example the Sigma 35/1.4 | Art is fully different. Smooth bokeh in every situation.
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