Sigma 10-20 f4-5.6

jeffw · 03-11-2015, 01:03 PM

Just purchased The Sigma 10-20 at the recent price reduction from B and H . The lens showed up at my door right before leaving on vacation so I threw it in my carry on and off I went . I am new to the ultra wide waters so I would like to know if the IQ is acceptable. Enclosed are some random untouched jpegs from my K-30. Any thoughts from other owners would be great . Thanks

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rawr · 03-11-2015, 02:34 PM

They look good, although a few seem a tad under-exposed. Check out the Photozone tests for that lens - basically anything from f5.6 and above and you will be doing OK.

If you don't already have one, a circular polarizing filter is a good addition to that lens for many outdoor scenes.

jeffw · 03-11-2015, 02:58 PM

Underexposed is ok for post. Just concerned about sharpness. CPL is my next purchase , it will fit my Tammy 70-200 also. I am new to ultra wide so I have to practice! Read concerns about quality issues on forum but this lens seems fine. Nice to have other opinions. Thanks.

**rod_grant** · 03-11-2015, 03:26 PM

Hi Jeff.
Enjoy the new Siggy.
I just found a Siggy 10-20 club on the forum.
Have a look and join in.
https://www.pentaxforums.com/forums/122-lens-clubs/84539-sigma-10-20mm-club.html

---------- Post added 03-12-2015 at 09:27 AM ----------

PS. I have had mine for a while but not given it the work it deserves: it can be a bit of a learning curve.
If you point it down at all, just make sure that your shoes are polished!

jeffw · 03-11-2015, 03:31 PM

Haha just got back from viewing the 10-20 club! I have much to learn. Many talented people on this forum. ! I am not worthy.

**rod_grant** · 03-11-2015, 04:49 PM

Originally posted by jeffw

I am not worthy.

Not many of us are!
But there are a few who are really inspirational: When you have seen a few of Ken Goh's have a look at his stuff on Flickr!

**Bruce Clark** · 03-11-2015, 05:42 PM

I picked up one of these a few months ago and love it. I find the lens to be sharp. I like the rendering of clouds in particular in wide shy shots. Just be careful with CPL though or you can get uneven effects in blue sky.

**clackers** · 03-11-2015, 07:35 PM

They say the Siggy 8-16 is the one to get, but this is cheaper and I'm happy with mine.

**mgvh** · 03-11-2015, 08:45 PM - **1 Like**

I'm not sure a CPL is a good idea either when shooting with such a wide lens.
The pics look good to me, but you may want to check optimal settings for your lens. On mine, 10mm is softer than the 20mm end. Further, I get best results at the 10mm end at f8. As I zoom to 20mm, I actually get better results opening it up so that f5.6 at 20mm is best.

rawr · 03-12-2015, 12:24 AM

Originally posted by Bruce Clark

Just be careful with CPL though or you can get uneven effects in blue sky.

This is true. I messed up some recent shots not paying attention to that, particularly when shooting at 10mm.

narual · 03-12-2015, 02:47 AM

While i don't typically suggest Ken Rockwell, his article on ultra wide lenses is pretty good and worth a read.

How to Use Ultra-Wide Lenses

sky gradient from the CPL is easy enough to fix if it's a clear-ish blue sky, and isn't as noticeable when it's cloudy. But do watch for it when you're using it outdoors, and remove it if you need to.

jeffw · 03-12-2015, 05:17 AM

Stopping down at 10MM produces fairly good results. Wide open at 20MM . I'll give it a try. Thanks for the tip! Will a linear PL work on a K-30? I seem to have read on the forum that it would work on Pentax bodies.
Just asking because I already own a 77MM from my film gear days.
Very popular lens,glad I took the plunge.

jgnfld · 04-13-2015, 07:01 AM

Originally posted by jeffw

Stopping down at 10MM produces fairly good results. Wide open at 20MM . I'll give it a try. Thanks for the tip! Will a linear PL work on a K-30? I seem to have read on the forum that it would work on Pentax bodies.
Just asking because I already own a 77MM from my film gear days.
Very popular lens,glad I took the plunge.

I got this lens a few weeks ago and have come to love it for any place there are lots of angles. While I too am not worthy, I have posted some of my first experiments in the lens club and lens example threads as examples of what the lens can do, at least. 1 post got a "like"!

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03-11-2015, 02:34 PM	#2
rawr Veteran Member Join Date: Jun 2009 Posts: 11,913	They look good, although a few seem a tad under-exposed. Check out the Photozone tests for that lens - basically anything from f5.6 and above and you will be doing OK. If you don't already have one, a circular polarizing filter is a good addition to that lens for many outdoor scenes.

03-11-2015, 02:58 PM	#3
jeffw Senior Member Join Date: Jul 2012 Location: Rhode Island Photos: Gallery Posts: 182 Original Poster	Underexposed is ok for post. Just concerned about sharpness. CPL is my next purchase , it will fit my Tammy 70-200 also. I am new to ultra wide so I have to practice! Read concerns about quality issues on forum but this lens seems fine. Nice to have other opinions. Thanks.

03-11-2015, 03:26 PM	#4
rod_grant Site Supporter Join Date: Apr 2010 Location: Wangaratta, Victoria Photos: Gallery Posts: 6,951	Hi Jeff. Enjoy the new Siggy. I just found a Siggy 10-20 club on the forum. Have a look and join in. https://www.pentaxforums.com/forums/122-lens-clubs/84539-sigma-10-20mm-club.html ---------- Post added 03-12-2015 at 09:27 AM ---------- PS. I have had mine for a while but not given it the work it deserves: it can be a bit of a learning curve. If you point it down at all, just make sure that your shoes are polished!

03-11-2015, 03:31 PM	#5
jeffw Senior Member Join Date: Jul 2012 Location: Rhode Island Photos: Gallery Posts: 182 Original Poster	Haha just got back from viewing the 10-20 club! I have much to learn. Many talented people on this forum. ! I am not worthy.

03-11-2015, 04:49 PM	#6
rod_grant Site Supporter Join Date: Apr 2010 Location: Wangaratta, Victoria Photos: Gallery Posts: 6,951	Originally posted by jeffw I am not worthy. Not many of us are! But there are a few who are really inspirational: When you have seen a few of Ken Goh's have a look at his stuff on Flickr!

03-11-2015, 05:42 PM	#7
Bruce Clark Loyal Site Supporter Join Date: Mar 2010 Location: Ocean Grove, Victoria Photos: Gallery \| Albums Posts: 4,458	I picked up one of these a few months ago and love it. I find the lens to be sharp. I like the rendering of clouds in particular in wide shy shots. Just be careful with CPL though or you can get uneven effects in blue sky.

03-11-2015, 07:35 PM	#8
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	They say the Siggy 8-16 is the one to get, but this is cheaper and I'm happy with mine.

03-11-2015, 08:45 PM - 1 Like	#9
mgvh Site Supporter Join Date: Sep 2010 Location: MD Photos: Gallery \| Albums Posts: 1,029	I'm not sure a CPL is a good idea either when shooting with such a wide lens. The pics look good to me, but you may want to check optimal settings for your lens. On mine, 10mm is softer than the 20mm end. Further, I get best results at the 10mm end at f8. As I zoom to 20mm, I actually get better results opening it up so that f5.6 at 20mm is best.

03-12-2015, 12:24 AM	#10
rawr Veteran Member Join Date: Jun 2009 Posts: 11,913	Originally posted by Bruce Clark Just be careful with CPL though or you can get uneven effects in blue sky. This is true. I messed up some recent shots not paying attention to that, particularly when shooting at 10mm.

03-12-2015, 02:47 AM	#11
narual Veteran Member Join Date: Jun 2013 Location: South Bend (Notre Dame), Indiana Photos: Gallery \| Albums Posts: 1,988	While i don't typically suggest Ken Rockwell, his article on ultra wide lenses is pretty good and worth a read. How to Use Ultra-Wide Lenses sky gradient from the CPL is easy enough to fix if it's a clear-ish blue sky, and isn't as noticeable when it's cloudy. But do watch for it when you're using it outdoors, and remove it if you need to.

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03-12-2015, 05:17 AM	#12
jeffw Senior Member Join Date: Jul 2012 Location: Rhode Island Photos: Gallery Posts: 182 Original Poster	Stopping down at 10MM produces fairly good results. Wide open at 20MM . I'll give it a try. Thanks for the tip! Will a linear PL work on a K-30? I seem to have read on the forum that it would work on Pentax bodies. Just asking because I already own a 77MM from my film gear days. Very popular lens,glad I took the plunge.

04-13-2015, 07:01 AM	#13
jgnfld Moderator Loyal Site Supporter Join Date: Feb 2015 Location: Avalon Peninsula, Newfoundland Photos: Gallery \| Albums Posts: 1,787	Originally posted by jeffw Stopping down at 10MM produces fairly good results. Wide open at 20MM . I'll give it a try. Thanks for the tip! Will a linear PL work on a K-30? I seem to have read on the forum that it would work on Pentax bodies. Just asking because I already own a 77MM from my film gear days. Very popular lens,glad I took the plunge. I got this lens a few weeks ago and have come to love it for any place there are lots of angles. While I too am not worthy, I have posted some of my first experiments in the lens club and lens example threads as examples of what the lens can do, at least. 1 post got a "like"!