Lenses… EX DC OS HSM AL SDM MAC… ###?

[FALCONLORD]

So I am starting to see the limitation of my Walkaround Lens and am starting to look at alternatives, and find a pair of lenses that could each fill the role with faster glass… and then start looking at the details (Because we all know the devil is in the details)
So I am looking at
Sigma Lens 17-50mm f/2.8 EX DC OS HSM for $879
Or
Sigma Lens 18-50mm F/2.8 EX DC Macro for $541
So… What in this case does OS & HSM amount to, how does it (And all of the other available initials) effect me in real terms.
For $338 it is worth knowing.

[FALCONLORD]

Looks like with a little research I have the answer
http://www.sigmaphoto.com/sigma-lens-technology

[I @ M]

What brand of camera are you using mate?

If you want faster glass and to be able to experiment with composition in low light, depth of field and so forth I would argue for a fixed focal length and a faster than F/2.8 aperture.

After all, the difference between a walk around zoom lens and a prime lens is ---- the walk ---

[Elogosha]

What brand of camera are you using mate?

If you want faster glass and to be able to experiment with composition in low light, depth of field and so forth I would argue for a fixed focal length and a faster than F/2.8 aperture.

After all, the difference between a walk around zoom lens and a prime lens is ---- the walk ---

Very good point...thanks!

[Tatts]

Have you considered the Tamron 17-50mm?

[MarkChap]

DC - Crop sensor lens
OS - Optical Stabiliser (IS,VR, if you will)
HSM - Hypersonic Motor


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