Camera Labs

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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Canon 7D/350D, Σ17-50/2.8, 18-55IS, 24-105/4 IS, Σ30/1.4, 50/1.8, 55-250IS, 60/2.8, 70-200/4 IS, 85/1.8, 580ex II, 430EX II, 270EX II.

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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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.

Could be a worthy competitor to the 18-105 VR from nikon!

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I take pictures so quickly, my highschool was "Continuous High".

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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Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews, My Pictures, My Photography Blog
D800+assorted lenses

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: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.

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: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.

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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Canon 7D/350D, Σ17-50/2.8, 18-55IS, 24-105/4 IS, Σ30/1.4, 50/1.8, 55-250IS, 60/2.8, 70-200/4 IS, 85/1.8, 580ex II, 430EX II, 270EX II.

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: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.

yeah, but being discontinued it is going to get harder and harder to find a 17-85IS new

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Canon 7D/350D, Σ17-50/2.8, 18-55IS, 24-105/4 IS, Σ30/1.4, 50/1.8, 55-250IS, 60/2.8, 70-200/4 IS, 85/1.8, 580ex II, 430EX II, 270EX II.

so no real test of this yet? Cant decide if buy this one or nikons 18-105.

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Nikon D40
Nikon 18-70mm f/3.5-4.5 G IF-ED DX

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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Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews, My Pictures, My Photography Blog
D800+assorted lenses

Well, I'm sure the build quality will be about the same? It felt pretty good.

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I take pictures so quickly, my highschool was "Continuous High".

I've got a question via flickr:

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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Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews, My Pictures, My Photography Blog
D800+assorted lenses

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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canon eos 50D
18-55mm kit lens
50mm f/1.8
55-250mm
sigma 17-70mm f/2.8-4 OS HSM MACRO

sample shots of sigma 17-70mm f/2.8-4 os hsm


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canon eos 50D
18-55mm kit lens
50mm f/1.8
55-250mm
sigma 17-70mm f/2.8-4 OS HSM MACRO