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Old Oct 13, 2010, 10:37 PM   #1
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Default Sigma 17-50mm f/2.8 EX DC OS HSM

Anyone try this new Sigma lens?

I'm looking for the very best repacement I could find for my Kx's 18-55 kit lens, and from all the research I've done, this seems to be tops.

Anything better out there I might be missing?
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Old Oct 14, 2010, 12:20 AM   #2
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the pentax DA* 16-50mm f2.8 but also probably costs alot more

for a standard zoom i think you'd be better off with one of the non stablised lenses most reports i've heard put them as slightly sharper than the stablised ones and since pentax bodies have stablisation in the camera its not needed

i have the sigma 18-50mm f2.8 and its a good lens - though reports are that the tamrom 17-50mm f2.8 is abit sharper but build quality is slightly less
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Old Oct 14, 2010, 1:36 AM   #3
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Thanks John,

So what Sigma version would be best for the Kx?

17-50mm F2.8 EX DC OS HSM

18-50mm F2.8 EX DC Macro

Last edited by Braciola; Oct 14, 2010 at 1:55 PM.
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Old Oct 14, 2010, 5:35 AM   #4
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John. I've read a number of times that it is better to use the in-lens stabilisation and switch off the in-camera SR. Seems to be better and also the AF faster in those lenses. I don't have any of them so don't know how true this is.
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Old Oct 14, 2010, 5:47 AM   #5
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for long focal lengths the in lens stablisation is better - but in a normal zoom there is no difference however and the sigma and tamron lenses have all been noticeably less sharp in the stabilised versions - presumably because there is moving elements and they can preceisly control them as accurately as you can with a fixed piece of glass

the autofocus with HSM will be superior - and i didn't realise it but is sigma offers the 18-50 f2.8 macro with hsm but without the OS i would take that lens as it will be sharper than the 17-50mm and same autofocus - and on the plus size its always nice to have a lens that lets you close focusing too
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Old Oct 14, 2010, 8:52 AM   #6
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I've never tried that Sigma....but if you would consider wider wide angle and shorter at the top angle....then the Pentax 12-24 mm is really hard to beat for picture quality. Pop Photo calls it best in class.

The Sigma has F 2.8....compared to the 12-24mm's F 4....but I've got an F 2.8 50mm macro and F 1.4 50mm normal- both Pentax and I find I rarely use below F 4-5.6....for reasons of narrow DOF.

I find that the modern digital SLR with it's ability to raise / lower the ISO at any time and still get half decent pix with little apparent noise at higher ISO....is something I would rather do then go to F1.4 to F2.8.

But I realize that's personal preference on my part.
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Old Oct 14, 2010, 2:09 PM   #7
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Quote:
Originally Posted by John.Pattullo View Post
- and i didn't realise it but is sigma offers the 18-50 f2.8 macro with hsm but without the OS i would take that lens as it will be sharper than the 17-50mm and same autofocus
My bad John, they don't offer that one.
I went back & edited my selection.

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Old Oct 14, 2010, 3:03 PM   #8
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Thank you all so much for your help!

Okay, here is my short list of everything I'm considering.
I would like to order one of these ASAP.
Again, looking for best IQ to use with me Pentax Kx
I broke them up in two categories......if the longer reach lens are going to sacrifice too much IQ, then just ingnore them
What lens would you choose?


Sigma NEW 17-50mm F2.8 EX DC OS HSM

Sigma 18-50mm F2.8 EX DC Macro

Tamron 17-50mm f/2.8 XR Di-II LD Aspherical [IF]

Pentax SMCP-DA* 16-50mm f/2.8 ED AL (IF) SDM

===============================================

Sigma 24-70mm F2.8 IF EX DG HSM

Sigma 24-70mm F2.8 EX DG Macro

Tamron AF 28-75mm f/2.8 XR Di LD Aspherical (IF)



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Old Oct 14, 2010, 3:12 PM   #9
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I have the sigma 1770 for sony but this may affect you anyway. since it's 2.8, it's larger than the kit lens. it occludes my on camera flash a lot at the wider angles. there's a shadow at the bottom middle every time i forget that fact!
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Old Oct 14, 2010, 3:55 PM   #10
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Quote:
Originally Posted by frank-in-toronto View Post
I have the sigma 1770
That's not on my list
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