Wide angle zooms

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Luke_

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Luke
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Im after a 10-20mm (or there abouts) wide angle lens, with 10mm being at its widest.

And I do not want a fisheye lens, im after a lens for landscape photography.

Now I see there are two real choices I have..

Sigma 10-20 mm f4-5.6 EX DC HSM (non hsm for pentax + sony)

Or

Sigma 10-20 mm F3.5 EX DC HSM

Now my question is, will the first one be good enough, or do you reckon its worth saving to get HSM and f3.5?

Anyone here uses either lens? Will I really need HSM as I have built in IS and AF within the body of my camera?
 
HSM just means the lens focusses more quietly and faster doesn't it? As far as I can tell, there's not much advantage for a landscape lens, as I can't see noise levels being too much of an issue. Personally I've recently bought the Tamron 11-18, which is held in fairly low regard, but mine it plenty sharp and I got it for over £100 less than the Sigma 10-20 f/4-5.6!
 
Yea, I thought it was mainly for older cannon/nikon camera that didn't have IS and AF built into the body.
 
It's got nothing to do with IS, but there could be an in-body AF issue. I'm not sure about anything Pentax, but if you don't have a focus motor built into the body, you might need the HSM version. Not really an age thing, just a range thing. It's much simpler with Canon ;)

Chris
 
Or OS whatever some of their sigma lenses have. But like I said, I dont think I need it as my camera body has it all built in!
 
I think the difference between these lens is there speed: The expensive one is f3.5throughout its range the other is f4-5.6!!

So I guess it depends on if a faster lens is important to you(and you have the extra cash!!)
 
I used to own the Sigma 10-20 (non-hsm) in Pentax fit and found it pretty good, to be honest I didn't really find it that useful for landscapes but that's just down to my own personal "style", many people find it great for landscapes.

Personally if your use is mainly landscape shots I wouldn't spend the additional cash for the HSM version, I always found the non-HSM focused pretty quickly anyway and the slight speed advantage of the HSM version probably won't be very noticeable 99% of the time

Simon
 
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