Sigma 17-50mm/f2.8 EX DC OS HSM for Canon and Nikon

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If you own a Canon or Nikon APS-C format compact DSLR and you're looking for a reasonably-priced, fast wide-to-short-telephoto lens to go along with your camera, you should take a look at the Sigma 17-50mm/f2.8 EX DC OS HSM zoom lens.


Featuring a fast, f/2.8 maximum aperture throughout its entire zoom range, the Sigma 17-50mm/f2.8 EX DC OS HSM has an equivalent focal length of a 25.5mm to 75mm lens when used on a Nikon compact (APS-C) DSLR and a 27.2mm to 80mm lens when used on a Canon compact (APS-C) DSLR.

The Sigma 17-50mm/f2.8 features up to 4-stops of optical image stabilization (OS) , close-focusing down to 11" (28cm), a 3.6" (91.8mm) travel-friendly size, two-touch control, Hyper-Sonic Motors (HSM), and FLD glass with Super Multi-Layer coatings.

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 Shouldn't this be 25.5 -75mm equivalent focal length on a Nikon DX (APS-C) DSLR?

Does the lens barrel extend on this lens when zoomed?

<a href="mailto:mick@mickklassphoto.com">mick@mickklassphoto.com</a> wrote:

 Shouldn't this be 25.5 -75mm equivalent focal length on a Nikon DX (APS-C) DSLR?

Does the lens barrel extend on this lens when zoomed?

Mick,

Morris unfortunately ran out of ramp space while skateboarding the other day and will be out of the office for at least another week, so I'm taking up his slack until he returns.

Looks like you caught his gaff about the equivalent focal length for this lens. He apparently used 70mm as his starting point instead of 50mm, hence the error in math.

As for your question about whether the lens barrel extends when you zoom in and out, according to reliable un-named sources it does.

Their 18-50mm f/2.8 is around 350-400.  I don't know I'd be too thrilled to spend that much more on just one more mm on the wide end. 

You're not paying for the extra 1mm, you're paying extra for the "OS" - Optical Stabilization.

It is perfect if you own a 50-150mm 2.8 from sigma... I want one of these

 Does anybody know about autofocus on this thing? Sigma's AF sucks on Canon EOS bodies as far as I'm concerned-

This was the descrition in the email I recieved today:

Sigma 17-50mm/f2.8 EX DC OS HSM for Canon and Nikon

Sigma’s new 17-70mm/f2.8 EX DC OS HSM is a fast wide-to-short telephoto zoom lens designed to fit Canon and Nikon compact DSLRs.

This makes me wonder what is going on.......is Sigma secretely trying to tell us that they are getting ready to release a 17-70 Constant F2.8????????????  This would be so great especially if it were also FF.

ART SCOTT FOTOGRAFIE wrote:

This was the descrition in the email I recieved today:

Sigma 17-50mm/f2.8 EX DC OS HSM for Canon and Nikon

Sigma’s new 17-70mm/f2.8 EX DC OS HSMis a fast wide-to-short telephoto zoom lens designed to fit Canon and Nikon compact DSLRs.

This makes me wonder what is going on.......is Sigma secretely trying to tell us that they are getting ready to release a 17-70 Constant F2.8????????????  This would be so great especially if it were also FF.

The lens described in this post is a 17-50mm lens... not any longer and not any wider, and it's f/2.8 throughout it's zoom range.

I heard there is no full-time manual focus available on this lens?

Anyway, I was eagerly looking forward to this lens, but I just picked up a Canon el-cheapo equivalent 17-50 I think, with filter and hood, for $174 shipped, thanks B&H!!

I might upgrade later to the regular Sigma 24-70 f2.8 model, not sure. But I'm still considering this one for an upgrade, depending on more reviews.

Well, will someone from B & H check out with Sigma, Art Scott's question.

I am looking at a Sigma lens in this range bracket, but will wait for clrification.

The review at photozone.de is pretty positive about this lens.  Soft corners at f/2.8 but they disappear beyond f/4.  Great center resolution. Low chromatic aberrations and decent bokeh.  AF is fast and nearly silent.  No full-time manual focus (bummer).  Still I'd like to play around with one someday.

Wonder how this lense will compare with the Tamron 17-50 F2.8 VC

Everything the same except that the Sigma has HSM.

The AF isn't that bad with Tamrons although they are a little noisy.

Will be Interesting to see how the market will turn out between the two for the 3rd party lense.

=)

Muito show essa lente pretendo comprar uma para nikon excelente qualidade de baixo custo comparando as originais.

I think is very useful for 2.8 :)..... I want it!