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PostPosted: Sat Dec 03, 2011 8:12 pm 
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Joined: Mon Jan 18, 2010 3:52 pm
Posts: 2175
Location: The Netherlands
Hi all,
Im saving money for a new wide-angle lens. I was going for the Sigma 17-70 OS HSM because lenstip.com reviewed it as an excelent lens (from the 17-50mm range), but few days ago I saw a used Sigma 18-50 Macro going for $150 here, and that made me thinking about getting a fast zoom instead of a better walk-around lens.

What it'll be used for? Everything and nothing. City trips, wide-angle shots, wide-field astrophotography, some portraits, street shots, flowers, holidays...

Why the 17-70? Well, it has both OS and HSM and 20mm extra range. It also features a quite good macro mode (1:2,7). The vignetting at the shorter lenghts isnt somthing Im fond of, astrophotography isnt that fun with vignetting. Likes to be the best walk-around lens I can afford.

The Sigma 18-50 Macro. Im not too sure about how to think about this one. I love its 2,8 aperture, low CA and vignetting values, though I 'hate' the 18mm focal lenght: people say it's more like 18,6-19mm... Though, at least the zoom and focus ring are both the same direction as the Canon's, and the build quality is kindoff good.

The Tamron is used here quite often. Why? It's sharp and has a nice 17mm wide angle lenght. As I understood, the quality of the Sigma 18-50 Macro is as good or maybe even better (not confusing with the 18-50 non macro!).
What I dislike are the magnification (1:4,5), less good build and the CA at wide-angle.

What do you think? I have time enough as I dont have the money yet.

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Ruben

Panasonic DMC-FZ18, Panasonic DMC-FZ28, Canon G5, Canon 350D, Canon 50D + BG-E2N
Tamron 17-50 2.8, Canon EF 70-200mm f/4L USM,
Canon 18-55 II plus lots of Minolta MD/M42 lenses and bodies


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PostPosted: Sun Dec 04, 2011 12:22 am 
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Joined: Mon Dec 11, 2006 7:01 am
Posts: 1164
Location: bit east of Melbourne
I personally would pick the 17-50 Tamron, with Sigma lenses in general there seems to be issues regarding focus accuracy. If you can try and test the lens before buying it that may make a difference.
Not sure about the 18-50 macro, but on SLRgear it mentions that it benefits from stepping down. Question really is do you need or want a macro lens.

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Canon Powershot S95, Canon 6D,7D, Canon 40 2.8 STM, Tamron 24-70 2.8 VC, Canon 17-40 L, Canon 15-85, Canon 85 1.8, Sigma 30 1.4, 50mm 1.8, Canon 100 2.8L Macro, Canon 70-300L +Kenko 1.4 Pro 300DGX, Canon 430EX II and RS 4 Classic


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PostPosted: Sun Dec 04, 2011 10:23 am 
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Joined: Mon Jan 18, 2010 3:52 pm
Posts: 2175
Location: The Netherlands
Ok, thanks. The Macro 'mode' would be useful for flowers, I think. Moreover, the 50D has Micro AF Adjust, does that make sense? Or arent you talking about front/backfocus?

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Ruben

Panasonic DMC-FZ18, Panasonic DMC-FZ28, Canon G5, Canon 350D, Canon 50D + BG-E2N
Tamron 17-50 2.8, Canon EF 70-200mm f/4L USM,
Canon 18-55 II plus lots of Minolta MD/M42 lenses and bodies


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PostPosted: Sun Dec 04, 2011 11:47 pm 
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Joined: Mon Dec 11, 2006 7:01 am
Posts: 1164
Location: bit east of Melbourne
nearly every review on Sigma lenses, seems to indicate focus accuracy. Not consistent front or back focus, just inconsistency. Maybe its just with Canon bodies, but its made me wary about buying Sigma lenses without first trying them.
ie see link below
http://www.the-digital-picture.com/Revi ... eview.aspx

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Canon Powershot S95, Canon 6D,7D, Canon 40 2.8 STM, Tamron 24-70 2.8 VC, Canon 17-40 L, Canon 15-85, Canon 85 1.8, Sigma 30 1.4, 50mm 1.8, Canon 100 2.8L Macro, Canon 70-300L +Kenko 1.4 Pro 300DGX, Canon 430EX II and RS 4 Classic


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PostPosted: Mon Dec 05, 2011 3:33 pm 
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Joined: Mon Jan 18, 2010 3:52 pm
Posts: 2175
Location: The Netherlands
There youve got a point. Ill look at the Tamron then, thanks! ;)

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Ruben

Panasonic DMC-FZ18, Panasonic DMC-FZ28, Canon G5, Canon 350D, Canon 50D + BG-E2N
Tamron 17-50 2.8, Canon EF 70-200mm f/4L USM,
Canon 18-55 II plus lots of Minolta MD/M42 lenses and bodies


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