Tamron 28-75mm f/2.8 vs Sigma 17-70mm f/2.8-4

[chjing]

hi, wondering which lens would you buy?

[antere]

it really depends on what you will be shooting.

[kelccm]

These 2 lenses have different focal length, it depends on whether you want to have a wider angle view and what type of body you are using it with. The Sigma is only suitable for APS-C size sensor while you can use the Tamron for full frame camera. But the Sigma allows you to go wider on APS-C size camera.

I bought the Tamron 28-75mm f/2.8, for the constant 2.8 aperture and the ability to use with my film body. I have another ultra wide zoom to cover the wide angle view. You may prefer to have Sigma for the larger range of focal length. Both lenses are quite good for their price.

[chjing]

i am using Canon 350D. i have heard very good reviews about the tamron 28-75mm. For the sigma 17-70mm, besides wider, wat other strengths over the tamron?

[PointBlue]

You may want to take a look at this review about the Sigma over here
http://photozone.de/8Reviews/lenses/...2845/index.htm

[jdredd]

no brainer to me.. tamron - if u get a good copy, its fantastic IQ.. and F2.8 all the way.

if i need something wide i.e. 17mm-28mm.. i can always use kit lens.

[ioriroger]

tamron 28-75mm f/2.8 good for potrait & sigma 17-70mm f/2.8-4 for potrait also landscape.
make ur own decision

[dominator]

To me is a question of,

need a fast lens? or a wide lens?

If wide(landscape) I won't need fast lens.

[bwilly]

depends on wat u r shooting?
at 28-75 if u shoot alot of indoor with little light, then this is the lens.

Else 17-70 is good enuff for most needs, plus help with an external flash whenever you need to shoot indoor.

For me, I like to shoot landscape, 17-70 will be the one I will be going for.

[ioriroger]

i think f4 is not as slow lens as u think it is. correct or not?

[ExplorerZ]

Originally Posted by ioriroger i think f4 is not as slow lens as u think it is. correct or not?

its actually f2.8-4.5... 1stop does make a different when you are in a desperate situation like ISO1600 yet unable to get sufficient shutter speed.

[bwilly]

Originally Posted by ioriroger i think f4 is not as slow lens as u think it is. correct or not?

Outdoor in daytime, f4 is more than enuff..
Indoor, you need as fast as you can go.. or rather as wide.

[jdredd]

Originally Posted by ioriroger i think f4 is not as slow lens as u think it is. correct or not?

... wider aperture also has effect on bokeh.. and AF speed..