Reading mode: Light Dark

Let's see your Sigma 10-20 100% crops

Go to last post
Here are my Sigma 10-20 shots:



100% crop center:





100% crop center:





100% crop center:



--
Nikon D50
Sigma 18-200 DC
Nikon 50 mm 1.8
Nikon 50 mm 1.4
Nikon 80-200 AF-D f2.8
Tamron 28-75 f2.8
Sigma 10-20 HSM
Lensbaby three G
SB-600 flash

Lens Lust is Bad!!!

 
I have also Sigma 10-20.

I have a general remark. When you compare crops from the corners, make sure that you are judging the sharpness and not the (lack of) sharpness due to DOF effects.

Greetings,
Ivo
 
What camera? That determines the magnification level of the 100% crop. A D70 is going to 'look' sharper at 100% than a D200. (D70 also generally applies more in-camera sharpening)

How did you focus? Ultra wides are notorious for poor AF accuracy. If evaluating lens sharpness do some focus bracketing. You may find it's not quite focusing on the target.

How does the image look at the same offset on the other side of the image? The lens might be suffering from a centering defect.

As Strawberry asked: Did you hand hold this photo? The scene looks bright so the shutter speed was probably high enough to hand hold. But when viewing at 100%....

Comment: Adobe PS CS2 is stripping some valuable EXIF data.

Steve
 
I don't have that lens, but when I traced your post back to the other thread, I noticed you said that the shot was completely unsharpened. If that's the case, I think it looks quite normal. When I pull the crop into Photoshop CS and apply USM (300, 0.3, 2), it looks about as sharp as I would expect of a 100% crop, especially shot wide open. I also looked at the unsharpened crop at 400%, and it appears that almost all the sharp edges of lightposts, steps, etc. are resolved in 1-2 pixels, which is all you can really expect.

I'm convinced from past posting experience here that most of us are incapable of judging sharpness on completely unsharpened 100% crops. I've sworn it off - everything I post now is sharpened.

Ray Ritchie
 
Here is a unsharpened 100% crop (In camera sharping was turned off)
Nikon D80
Sigma 10-20

With absolutely no sharping it still looks great to me considering; 1. The D80 is 10MP, I could do this test on my D70 and it would look sharper. 2. It's a wide angle lens and I was focusing on the tree.
.
.
.



.
.
.
Here is the original shot.
.
.
.



--
Please visit my gallery at

http://kezz.deviantart.com
 
SteveL54 said:
What camera? That determines the magnification level of the 100%
crop. A D70 is going to 'look' sharper at 100% than a D200. (D70
also generally applies more in-camera sharpening)
Click to expand...
Now that's partly true, but remember that the difference in linear resolution is only about 25%. The D70 doesn't apply more in-camera sharpening for jpegs at default settings, and there is a big difference in acutance between the jpeg conversion in-camera and post-converted raw files.

I still think that the OP has a problem with his lens. Others have posted samples that don't look absolutely fantastic, but the blur is even looking. With the OP's samples, the blur looks decentered - like a little astigmatism is there (or camera movement - but I discount that as likely as shutter speed was high and f/l long).
 
The shot was handheld at 1/500s using a D80, shooting in RAW. The resulting image was converted untouched using Photoshop CS2.

I was holding the lens steadily. Given the wide angle and fast shutter speed, camera shake shouldn't have been a problem here.

I used autofocus on the center of the image, but at F/8 and this focal length, everything in the crop should have been in the hyperfocal distance. As another poster noted, the chateau was about 100 feet away.

I think the right side is slightly sharper, but not much so and it's an unfair comparison due to the angle of the sunlight. I'm going to take some more pictures this weekend.

After postprocessing, the image is OK for me, but I am slightly disappointed with the resolution of this lens.
SteveL54 said:
What camera? That determines the magnification level of the 100%
crop. A D70 is going to 'look' sharper at 100% than a D200. (D70
also generally applies more in-camera sharpening)

How did you focus? Ultra wides are notorious for poor AF accuracy.
If evaluating lens sharpness do some focus bracketing. You may find
it's not quite focusing on the target.

How does the image look at the same offset on the other side of the
image? The lens might be suffering from a centering defect.

As Strawberry asked: Did you hand hold this photo? The scene looks
bright so the shutter speed was probably high enough to hand hold.
But when viewing at 100%....

Comment: Adobe PS CS2 is stripping some valuable EXIF data.

Steve
Click to expand...
 
i love your truck/tractor I try to get such picture since a long time put I always do something wrong.

could you help me out with a little bit technique to create such a shot?

thx and I highly appreciate it
 
bfrog said:
The shot was handheld at 1/500s using a D80, shooting in RAW.
Click to expand...
That would eliminate camera shake. (I figured for sunny day assumming ISO 100 at f/8 you'd have to be around 1/400. But you might have had a ND filter on.... I had to ask.)
bfrog said:
I used autofocus on the center of the image, but at F/8 and this
focal length, everything in the crop should have been in the
hyperfocal distance. As another poster noted, the chateau was about
100 feet away.
Click to expand...
When you are viewing an image at 100% taken by a D80 the typical hyperfocal values don't apply. One will easily perceive differences of softness between the true focus distance and other objects that are within the DOF when using a typical CoC of 0.02 mm.

My Nikkor 12-24mm front focuses at the wide end and if I want distant objects to be really sharp at 100% I have to manually focus for the distant objects -- even on my D70. Fortunately I don't take many landscape type photos.

I'm not saying this is the problem, it's just a possibility to evaluate.
bfrog said:
I think the right side is slightly sharper, but not much so and
it's an unfair comparison due to the angle of the sunlight
Click to expand...
I don't see how the angle of sunlight would have a bearing on perceived sharpness between the left and right side of this photo. (It would if the building where curved and the longer shadows on the side not directly facing the sun added more relief to the building's features) Anyway, if the right side is just slightly sharper, then count yourself lucky :-)
bfrog said:
After postprocessing, the image is OK for me, but I am slightly
disappointed with the resolution of this lens.
Click to expand...
There were lots of reports by folks transitioning from the D70 to the D200 when it first came out that the images from the D200 were soft. I think it was due to the case that users were used to a weak D70 AA filter and that when viewing at 100% they were magnifying the D200 image more.

Steve
 
Sigma 10-20mm wide-open at 20mm

Test Picture:



100% crop at center:

 
Okay - I'll play.

But not with edge crops of my other sample shot taken fully wide - "my mistake" as previously disclosed. Even so, I reckon it's about as sharp at the edges as some samples posted here from center frame.

10mm is where you get "edge softness", so here's a shot at 10mm (and these days I usually try to shift up to 12mm where the lens is in it's "sweet spot" for f/l for this kind of shot, so had to dig around for this shot - raw, and no sharpening - and most importantly for me because I hate and despise CA and fringing, no PP whatsoever including CA correction or sharpening. I think that the 10-20 is a truly remarkable lens, but it bugs the heck out of me that some seem to have not much luck.
Sorry it ain't a masterpiece, but here it is:





Grass - heh - I must be crazy posting that - but IMO it isn't actually too bad.



So, what's nearly everyone doing wrong?
 
freddyNZ said:
So, what's nearly everyone doing wrong?
Click to expand...
Not much.

Your 100% crop are marginally better in this image then some other posters here.

Variables like shutter speed focus point etc. could easily affect this.

I didnt doubt your ability or the lens, just wanted to point out that evealuating 100% crops on a monitor is hard enough, without variables like sharpening applied or not.

As for the sigma 10-20mm and as with many other sigma and 3rd party glass its simply sample variations.

You seem to have a good copy, and a good eye aswell.

Btw your first shot was very nice.

Kindest
--
Regards
Paul L.
 
Paul.R.Lindqvist said:
freddyNZ said:
So, what's nearly everyone doing wrong?
Click to expand...
Not much.

Your 100% crop are marginally better in this image then some other
posters here.

Variables like shutter speed focus point etc. could easily affect
this.

I didnt doubt your ability or the lens, just wanted to point out
that evealuating 100% crops on a monitor is hard enough, without
variables like sharpening applied or not.

As for the sigma 10-20mm and as with many other sigma and 3rd party
glass its simply sample variations.

You seem to have a good copy, and a good eye aswell.

Btw your first shot was very nice.
Click to expand...
Thanks,

Don't forget my crop samples were shot at 10mm, and there's nothing to compare edge sharpness at 10mm with - only Sigma makes one. Some of the other posters shots were at longer f/l, where at 12-15mm the 10-20 should truly shine.

Sample variation? Can't tell. I only ever got one sample ordered on the net, and the only lenses I've owned that I've not been happy with have been lenses renowned for being of pretty dodgy optical quality, including Nikkors.
 
I love mine also, though I haven't done any "tests" with it because I'm just pleased with the results it gives me, like this,



As someone with experience designing tests for precise equipment most of what I see here is not controlled enough to draw any conclusions from.
 
Hi Freddy,

I'm not sure we have the only two good ones (plus Kluso) on the planet. I think most people who complain about this lens don't realize that AF is not the ideal mode (same comment for Nikon 17-55mm/2.8). I got much better results edge to edge when manually focusing on infinity.

The picture I posted earlier is indeed in AF-mode with the sensor placed at the center of the picture. There is no sharpenning of any kind other than in-camera as per the EXIF. If anyone is interested in reviewing the original 10 MP picture please email.

Here are more 100% crops of the other areas of the picture including the lower right corner. Sorry I can't post the left upper corner which is mostly the sky in this picture. I'll try to post another picture with 100% crops later.

The entire picture at 20mm wide-open (f/5.6):



100% crop left side:



100% crop left edge:



100% crop right edge:



100% crop lower right corner:



100% of the flower pot:

 
You must log in or register to reply here.

Keyboard shortcuts

f
Forum
m
My threads
Mobile site
About
Editorial content
Cameras & Lenses
Community
All content, design, and layout are Copyright © 1998–2025 Digital Photography Review All Rights Reserved.
Reproduction in whole or part in any form or medium without specific written permission is prohibited.
When you use DPReview links to buy products, the site may earn a commission.
©GPS Media - Guides, Products, Services.
Back
Top