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07-11-2018, 04:44 PM   #1
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Any one use Sigma 20-40 DG on K1?

Im looking for a good wide angle zoom for my K1. Ive seen good reports for the Sigma 20-40 lens on Pentax crop sensors and mixed reports on FF camera. If anyone has experience with the lens on K1 please let me know and if possible some photo examples as well would be appreciated.
Garry

07-11-2018, 05:35 PM - 1 Like   #2
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Hi,


Sorry I don't have any photos but I had one for my K-1. It's big & heavy, so there's that. My copy was a bit sharper in the corners than my FA20-35 @ f4, but the difference disappeared by f8. Given the difference in size & heft I kept my 20-35 and sold the 20-40. YMMV
07-12-2018, 10:09 AM   #3
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Thanks for the info, weight is definitely a consideration. I'm almost at max weight for my travel carry-on camera bag. I've also been watching for a FA20-35 at a reasonable price, so far haven't found one I can afford. I have a feeling if I got the Sigma lens it might not make in my travel bag so that would defeat the purpose. I also have my eye on a FA24-50 which as available at a decent price on ebay but I really would like the option of going wider. Now I'm using an FA28-105 which is a great lens but I'd like the extra width.
07-12-2018, 04:33 PM   #4
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Another option is a portable sub-24mm prime. There's the M20/4, A20/2.8, Tamron & Tokina 17/3.5. All have their strengths & weaknesses but can get you some extra FoV and let you keep your WR zoom for standard stuff.

07-12-2018, 09:22 PM   #5
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That might be a way to go while I save some money for the 20-35 or wait to see what new lenses show up in a year or two. With a wide angle manual focus shouldn't be much of an issue and the K1's Catch in Focus feature works really well.
07-13-2018, 09:49 AM   #6
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Yes, give Krazykat's suggestion careful thought. It is amazing how much you can do with a good moderate wide angle prime.
07-15-2018, 01:44 AM   #7
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Another option to check is FAJ 18-35. I have it and FA 20-35. To my surprice FAJ may be the better one from the two. Pretty close to each other at least with my copies.

EDIT: I did get K-1 two weeks so my experience between FAJ 18-35 and FA 20-35 still bit thin. Just did a quick test and I think I keep FA and sell FAJ.

However corners of FA 20-35 has been worse than I hoped them to be with K-1. Again FAJ 18-35 has been better than I though it to be.

Last edited by Jyrkira; 07-15-2018 at 03:52 AM. Reason: More testing.
07-15-2018, 05:37 AM   #8
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Do not forget about the Tokina 20-35 and Tokina 19-35. A little bigger than the FA 20-35 but as big as the Sigma.

07-16-2018, 06:34 AM   #9
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Jyrkira,
I have been looking at the FAJ, I can get one at a reasonable price. Did you norice any difference in the distortion between the two lenses, particularly at the horizon line and atraight lines on the edges?
07-16-2018, 01:32 PM   #10
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QuoteOriginally posted by Garry Conway Quote
Jyrkira,
I have been looking at the FAJ, I can get one at a reasonable price. Did you norice any difference in the distortion between the two lenses, particularly at the horizon line and atraight lines on the edges?
At 20mm both FAJ 18-35 and FA 20-40 have roughly the same amount of barrel distortion. At 35mm FA 20-40 has little or no distrotion while FAJ 18-35 is distorted. I try to take better test images some day and post results here.

Now I sure the corner softness issue with FA 20-40 is actually field curvature. When focused to corner the softness is only in very extreme corner. I still need to shoot more with FAJ 18-35 to check if it is the same wiht it.
07-16-2018, 04:10 PM   #11
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The FAJ 18-35 acquits itself very well on K-1 for it's price, and it's super lightweight to boot. It's very convenient for lightweight kit/close-quarters street shooting. However, the color rendering (at least on my copy) is not as good as I would like.
07-17-2018, 12:02 AM   #12
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I did a quick test between FA 20-35 and FAJ 18-35. Please note I had do it in hurry while looking after my kids so I doubt the images may be front focused. Sorry no real world images now.

You can download the images from here. "Lataa kansio" bottom right corner.

Wide angle tests

To me FA 20-35 is clear winner.

I also took some images with DA 16-45. Not worth using it with K-1 IMO.
07-17-2018, 06:00 PM   #13
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Jyrkira

Thanks so much for doing the photograph samples, that is a big help. I agree with you that the FA20-35 is better but for a kit lens the FAJ 18-35 is impressive. I've also been looking at the Tokina 20-15 which looks interesting and gets fairly good reviews. The Sigma I first mentioned has been sold but it was a 2.8 lens which is so much larger and heavier. I'm not sure what I'm going to do but I'm watching all the auctions to see what shows up and still considering the FAJ. All the listing I've seen for the FA20-35 are more than 3 times the price of the FAJ. I might do the FAJ and hold out to see what Pentax comes out with in the next couple of years. Again thanks for taking the photographs.

I've also been looking at Primes as Krazykat suggested, they have become pretty expensive to.
07-17-2018, 09:28 PM   #14
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QuoteOriginally posted by Garry Conway Quote
I've also been looking at Primes as Krazykat suggested, they have become pretty expensive to.

The Tamron & Tokina 17/3.5 can be had for less than half the price of the Pentax 20's. They have their own pros and cons of course.


(Disclaimer: I have a Tokina 17/3.5 for sale on the marketplace, so take that into consideration when evaluating my comments )
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