Sigma 10-20 ! Are these SOFT images?

[smiller]

Hey Guys,
I just bought the Sigma 10-20 for Canon and i think my copy is extremely soft or there is an autofocusig problem. Please tell me if this is the case and if i should take it back. Thanks

Here are some pictures attached.

http://img409.imageshack.us/img409/8818/img9951yt0.jpg
http://aycu18.webshots.com/image/14617/2003662411839463914_rs.jpg

The one of the garden - Apeture (f10) - Shutter Speed (1/250) - ISO (100)
Focus was on the first brown window on the left hand side

Picture of the room - Apeture (f4) - Shutter Speed (1/50) - ISO (800)
Focus was on the front silver dish and as you can clearly see it is blured.
:o

[freebird]

Im thinking about gettin that lens. As far as soft....hmm I would go outside and run it thru it paces with higher shutter speeds. Shoot some contrasty subjects and such. Let us know how it goes if you would
Good luck

[syntrix]

Im thinking about gettin that lens. As far as soft....hmm I would go outside and run it thru it paces with higher shutter speeds. Shoot some contrasty subjects and such. Let us know how it goes if you would
Good luck
\

Actually I'd run it with a greater DOF. It's easy to say an UWA lens is soft, but there's a huge view at 10mm on aps-c, people easily are mistaken.

[mikeassk]

Mirror lock up?

[T Kubik]

Looks like a DOF issue. Try taking that outside shot again with the same settings and focus on something closer, like one of the potted plants on the near left. As for the second one, the back of the silver dish looks sharp, but you might want to do more bright light tests and stay away from the slow shutter speeds, as previously mentioned.

[EpHeSuS]

Hmm, people here need a clue.

1st image - You're probably just starting to bring in diffraction @ f/10, so you will lose sharpness. Try shoot the lens about f/8 most of the time, at 10mm, you have a HUGE FoV, so don't worry about DoF. Even then, this image looks plenty sharp, just apply a small unsharp mask and you'll be fine.

2nd image - Have a look at the background, need I say more?

[T Kubik]

Hmm, people here need a clue.


Well, thanks for so tactfully supplying one. All we're doind is offering our best guess, by no means am I claiming to be an expert, nor do I claim to have all the answers. So, how about you put your high horse in the stable and come join the rest of us in civil-discussion-land.:rolleyes:

[EpHeSuS]

Well, thanks for so tactfully supplying one. All we're doind is offering our best guess, by no means am I claiming to be an expert, nor do I claim to have all the answers. So, how about you put your high horse in the stable and come join the rest of us in civil-discussion-land.:rolleyes:

Do explain how the hell it looks like a DoF issue? In that landscape shot, there is nothing that is more out of focus then anything else - which blows the DoF issue out straight away.

Guessing gives people false information - if you don't know - don't say anything.

As for slow shutter speeds - 1/50th @ 10mm should be easy.

[angryhampster]

They don't look soft at all to me. Looks like you just missed focus @ f/4 on the second shot.

[T Kubik]

Maybe I'm just not used to looking at such large UWA pics, but to me the edge of the pool and the plants behind it look softer than the window. 1/50th SHOULD be ok, but I know people who can't shoot 1/100 at 17mm, so you never know.

I wasn't giving false information, I was merely suggesting trying a different technique to see if it helped. I'm just as curious as to know if the lens is soft or not.

if you don't know - don't say anything and if you can't say something nicely...

[EpHeSuS]

Maybe I'm just not used to looking at such large UWA pics, but to me the edge of the pool and the plants behind it look softer than the window. 1/50th SHOULD be ok, but I know people who can't shoot 1/100 at 17mm, so you never know.

I wasn't giving false information, I was merely suggesting trying a different technique to see if it helped. I'm just as curious as to know if the lens is soft or not.

and if you can't say something nicely...

Edge softness @ 10mm is to be expected, not much you can do about it.

That copy of the 10-20 looks perfect to me, you just need to learn to use it properly (as with any new lens)

I'm sorry if I sounded harsh, but I get a bit annoyed when there are 4 replies and all of them are wrong.

[smiller]

ok thanks guys!

[e r y k]

do you have a polarizer for the lens? if so, what kind? that may be degrading the quality if its a cheap one.

[cdifoto]

Looks plenty sharp to me! :)

[freebird]

Do explain how the hell it looks like a DoF issue? In that landscape shot, there is nothing that is more out of focus then anything else - which blows the DoF issue out straight away.

Guessing gives people false information - if you don't know - don't say anything.

As for slow shutter speeds - 1/50th @ 10mm should be easy.

Im just saying trying some troubleshooting b4 one passes judgement and sends the lens in to be calibrated, not that this gentlemen mentioned it but alot of questions on focus sure seem to escalate to its the lens error and we know thats not always the case. Im not going to argue , have a nice day:D