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Old Oct 13, 2009, 4:15 PM   #11
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With Sigma, there is more variation. If you have a good copy of that 30 1.4, its very damn good. If not, you can have problems with decentering, focus, general sharpness, etc. Which is a common theme among reverse-engineered lenses.

I am lucky in that my 1 sigma I do have, I got a nice sharp, contrasty copy.

if you are willing to do test after test, and send back bad copies. you can get a 30 1.4 that will perform better than the 28 1.8. however, on average, the 28 1.8 is a safer bet.
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Old Oct 13, 2009, 4:22 PM   #12
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I really do appreciate all of the feedback.

I guess another goal is to get more crispness out of the pictures. Here is a mid day shot I took ... I feel like it lacks detail and looks a bit soft:



Is there something I'm missing to make this more crisp?

Here are the camera settings:
Flash Used
55mm Focal Length
f/5.7
ISO 1600
1/4 Exposure Time

FWIW: This is untouched.

I'm wondering if the problem is the long exposure time (hand held) coupled with 1600 ISO?

Last edited by rijndael; Oct 13, 2009 at 5:19 PM. Reason: fixed picture and added details.
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Old Oct 13, 2009, 7:55 PM   #13
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I really think that your photo is reasonably sharp when you consider the ISO setting. Use the unsharp mask and add a bit of brightness and contrast, and I think you will be very pleased. The Sigma 17-70mm lens is a consumer level lens that is also very sharp and attractively priced.

Have a great day.

Sarah Joyce

Last edited by mtclimber; Oct 17, 2009 at 7:02 PM.
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Old Oct 13, 2009, 8:36 PM   #14
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i concur. looks fine for ISO 1600 and drab lighting conditions.
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Old Oct 13, 2009, 11:26 PM   #15
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So my standards are too high ..... I can live with that.

Thanks everyone.
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Old Oct 14, 2009, 3:48 AM   #16
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1/4s shutter speed?

It's a miracle you got a shot that sharp at all.

The slowest shutter speed that I can reliably get sharp results (at any focal length) with an SLR is around 1/25s with IS. 1/50s without.

For focal lengths longer than 50mm-e go with the 1/focal length-e rule.
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Old Oct 14, 2009, 11:23 AM   #17
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Quote:
Originally Posted by Hards80 View Post
With Sigma, there is more variation. If you have a good copy of that 30 1.4, its very damn good. If not, you can have problems with decentering, focus, general sharpness, etc. Which is a common theme among reverse-engineered lenses.
Sigma's reputation is not the greatest, mostly due to compatiblity issues with newer models of lenses and flashes (which they can sometimes fix by rechipping later). IOW, it's probably not a good idea to go with a first production run of a given lens.

But, camera manufacturers don't have a spotless reputation for QC either. For example, note this quote from the Verdict section of a Canon 24-70mm f/2.8L review over at photozone.de:

Quote:
During the last two years four lenses has seen the lab with only one within specs...
http://www.photozone.de/canon-eos/18...review?start=2
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Old Oct 14, 2009, 11:35 AM   #18
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Quote:
Originally Posted by JimC View Post
Sigma's reputation is not the greatest, mostly due to compatiblity issues with newer models of lenses and flashes (which they can sometimes fix by rechipping later). IOW, it's probably not a good idea to go with a first production run of a given lens.

But, camera manufacturers don't have a spotless reputation for QC either. For example, note this quote from the Verdict section of a Canon 24-70mm f/2.8L review over at photozone.de:



http://www.photozone.de/canon-eos/18...review?start=2

yes Jim, thanks for pointing out that its not so cut and dry, even with the magical "L" label.
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Old Oct 14, 2009, 11:36 AM   #19
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Quote:
Originally Posted by peripatetic View Post
1/4s shutter speed?

It's a miracle you got a shot that sharp at all.

The slowest shutter speed that I can reliably get sharp results (at any focal length) with an SLR is around 1/25s with IS. 1/50s without.

For focal lengths longer than 50mm-e go with the 1/focal length-e rule.
jesus, i didnt even notice that was at 1/4. that is pretty amazing its that sharp at all.
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