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Thread started 14 Sep 2006 (Thursday) 03:12
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How do I shoot sharpest images with Sigma 17-70

 
rakesh
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Sep 14, 2006 03:12 |  #1

Hi

I've recently purchased Sigma 17-70 for my day-2-day use.

Can anyone advise me what should be the setting and at what focal length I can get sharpest images without Noise and what should be the ISO, Aperture and Shutter setting.

For your information, I shoot only in RAW.

Regards

Rakesh


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Kennymc
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Sep 14, 2006 03:20 |  #2

There is no universal answer to this question...
ISO aperture and shutter setting all depend on the lighting conditions at the time of shooting along with the subject matter...

Having said that, the lower the ISO the less noise... Most lenses are sharper when stopped down a couple of stops, and the shutter speed should be at least equal to the focal length of the lens... If you use these as guidelines it should help...


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Coco-Puffs
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Sep 14, 2006 06:10 |  #3

tripod


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sandro9mm
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Sep 14, 2006 06:14 |  #4

start here: http://photo.net/learn​/making-photographs/ (external link)


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ron ­ chappel
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Sep 14, 2006 07:01 |  #5

I'm not sure if this is something that would be an issue for you ,but i see alot of 17-70 images online that *seriously* need post proccessing !




  
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Kennymc
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Sep 14, 2006 07:21 as a reply to  @ Coco-Puffs's post |  #6

Coco-Puffs wrote:
tripod

Always advisable, and a good suggestion... Using a tripod though is not always practical, besides it won't help with Rakesh's choice of aperture, shutter speed and ISO...

Can you post an image so we can see if we can determine where the problem is?...


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gef
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Sep 14, 2006 10:56 |  #7

I seem to like stopping down to approx. f/8. ISO 100-200.

ISO: 100
Exposure: 1/250 sec
Aperture: f/8.0
Focal Length: 17mm

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Greg

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Tee ­ Why
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Sep 14, 2006 12:10 |  #8

Consider things from this point of view.
Vary your Aperature to control DOF, vary your shutter speed to control sense of motion, vary your ISO to control light sensitivity and noise level. Consider using your focal length to control composition/distance from the subject. A properly composed shot will do much much much much more than a shot taken at a specific aperature and focal length to ensure maximum sharpness.

If you want to look at the numbers, photozone.de has the test numbers at various aperatures and focal lengths for sharpness.

But I think the object of photography as an art form (if you are interested in that) is to convey emotions, not a sense of sharpness. A minimum degree of sharpness is required to ensure that softness doesn't distract from the shot, but that is pretty much it. I know for certain areas such as architecture and landscapes that sharpness is important though, but again, I feel that just absolute sharpness is over emphasized.

Good luck


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Mr. ­ Clean
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Sep 14, 2006 14:59 as a reply to  @ ron chappel's post |  #9

ron chappel wrote:
I'm not sure if this is something that would be an issue for you ,but i see alot of 17-70 images online that *seriously* need post proccessing !

What the heck? ???

I would have to respectfully disagree with that.


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