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PostPosted: Fri Dec 04, 2009 7:20 am 
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Sigma announced a new lens today. I wonder what the IQ and cost will be?

http://www.sigma-photo.co.jp/english/ne ... os_hsm.htm

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PostPosted: Fri Dec 04, 2009 12:58 pm 
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I think it could have a spot as a "premium budget" standard zoom. Quality predictions seen elsewhere based on the MTF sound promising.

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Lenses: EF 35/2, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 10-18, 15-85
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 50/1.4A, 150 macro, 120-300 f/2.8 OS
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PostPosted: Fri Dec 04, 2009 1:06 pm 
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Could be a worthy competitor to the 18-105 VR from nikon!

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PostPosted: Fri Dec 04, 2009 5:33 pm 
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The MTF charts indeed look quite good.
But - unfortunately - this is not a good indicator of real life performance of Sigma lenses :?

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PostPosted: Fri Dec 04, 2009 5:57 pm 
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It is shorter/brighter than the Nikon though. I don't see a close spec Nikon or Canon equivalent. Compared to standard (short) zoom kit lenses, the increased zoom range and aperture could be nice at the right price.

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Canon DSLRs: 7D2, 7D1, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 10-18, 15-85
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 50/1.4A, 150 macro, 120-300 f/2.8 OS
Compacts: Sony HX9V, Fuji X100.


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PostPosted: Fri Dec 04, 2009 7:20 pm 
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amazon.com listing them at $449... but I don't know how $ really feel like even if I simply convert the numbers.

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Canon DSLRs: 7D2, 7D1, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 10-18, 15-85
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 50/1.4A, 150 macro, 120-300 f/2.8 OS
Compacts: Sony HX9V, Fuji X100.


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PostPosted: Fri Dec 04, 2009 11:27 pm 
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popo wrote:
It is shorter/brighter than the Nikon though. I don't see a close spec Nikon or Canon equivalent. Compared to standard (short) zoom kit lenses, the increased zoom range and aperture could be nice at the right price.


If the new Sigma performs well wide open, it could replace both my 18-55IS and my Tamron 28-75/2.8. I think it would be great competition for the New Canon 15-85 too. Trade in zoom range for wider apertures and save a 1/3 of the cost.

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PostPosted: Fri Dec 04, 2009 11:36 pm 
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I think the closer comparison choice is the Canon 17-85 at about the same price. There, the aperture advantage may win over the small focal length difference. The 15-85 is for when you really want a wider angle, as you wont get wider in a standard zoom.

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Canon DSLRs: 7D2, 7D1, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 10-18, 15-85
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 50/1.4A, 150 macro, 120-300 f/2.8 OS
Compacts: Sony HX9V, Fuji X100.


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PostPosted: Sat Dec 05, 2009 12:01 am 
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yeah, but being discontinued it is going to get harder and harder to find a 17-85IS new

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PostPosted: Fri Jan 08, 2010 10:43 am 
so no real test of this yet? Cant decide if buy this one or nikons 18-105.


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PostPosted: Fri Jan 08, 2010 2:33 pm 
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The predecessor, the Sigma 17-70mm f/2.8-4.5 DC (w/o OS gt 3 stars at www.photozone.de, the Nikon 18-105 VR also got 3 stars.
But: it is not always wise to extrapolate from a former Sigma lens to the current model :?

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PostPosted: Fri Jan 08, 2010 2:38 pm 
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Well, I'm sure the build quality will be about the same? It felt pretty good.

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PostPosted: Sun Jan 10, 2010 7:24 pm 
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I've got a question via flickr:
Quote:
Hi Thomas,

Is there any way to find out the corner sharpness of my lens Sigma 17-70mm f/2.8-4.5 & at which f stop it gives best sharpness.

I have clicked some shots @ f22 using Canon 40D body & still discovered the edges were soft & not sharp.

Cheers

As this is an often asked question I'll refer to a post I did there.
But f/22 should already show clear signs of diffraction. That will show soft rendering in the center and the corner. A better guess at the sharpest f-stop would be f/5.6 or f/8.0.
If a single corner is dissatisfying at f/8.0 this is a clear sign of a severe decentering defect and the lens should be returned. If all corners show the same softening (more or less) this is the characteristic of this optical design.

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PostPosted: Mon Jan 18, 2010 11:38 am 
i uploaded some pics on my flickr account some of my shots on this lens.
you can visit my account,
http://www.flickr.com/photos/gravs/

as of this moment, my lens is only 3 days old with me.
BTW i paired with eos 50d body.


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PostPosted: Fri Feb 19, 2010 1:37 pm 
sample shots of sigma 17-70mm f/2.8-4 os hsm

Image
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