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Old Apr 20, 2007, 7:40 AM   #1
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Hi,
I'm considering a new lend for the Canon XTi and just can't make up my mind between these two.

SIGMA 17-70MM F/2.8-4.5 DC MACRO
or
Tamron AF 17-50mm f/2.8 XR Di II LD Aspherical [IF]

I have checked reviews and both lenses seem quite good for the money.
Both have some barrel distortion at 17mm (wich is normal).
The Tamron seems to have a louder motor, but that is not a consern for me.
And the the obviouse is of cource that the Sigma has a wider zoom range.

But I wan't the best sharpness and image quality
Which lens would YOU recomend?
Thanks.
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Old Apr 20, 2007, 9:30 AM   #2
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I bought the Sigma 17-70 it's a very good lens and a really good walk around.
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Old Apr 20, 2007, 9:57 AM   #3
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Hi,

The Tamron is the one to get Its a very sharp lens and build quality is ok.AF can be a little noisy as this lens doesn't have HSM.

Check this out http://forums.steves-digicams.com/fo...mp;forum_id=65
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Old Apr 20, 2007, 11:20 AM   #4
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gaida wrote:
Quote:
Hi,

The Tamron is the one to get Its a very sharp lens and build quality is ok.AF can be a little noisy as this lens doesn't have HSM.

Check this out http://forums.steves-digicams.com/fo...mp;forum_id=65
Opinions very, but from that topic the 17-70 is the way to go, although the topic didn't have anything to do with the Tamron 17-50.
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Old Apr 20, 2007, 12:30 PM   #5
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Hi,

If you have a look at the MTF charts for the 2 lens you'll realise that the tamron is much better.Plus you are getting a constant F/2.8.

Sigma - http://www.photozone.de/8Reviews/len...2845/index.htm

Tamron -

http://www.photozone.de/8Reviews/len...0_28/index.htm
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Old Apr 20, 2007, 1:33 PM   #6
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i had the sigma and loved it .got really great pictures .the only reason i sold it was that i got the canon 17-55 so i could start doing weddings .if you get the sigma you won't be sorry(if you get a good copy) and you will like the extra reach.
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Old Apr 20, 2007, 2:39 PM   #7
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Thanks for all the comments.

I´m still torn between the lenses...hehe
Tamron for littlebetter images and Sigma for a wider zoom range (from what I gather).

NOW, just to complicate things ever further. I notices the:
Tamron AF 18-250mm F/3.5-6.3 Di II LD Aspherical (IF) Macro Lens

And comments on that lens?
From what I gather it also a fine lens.
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Old Apr 20, 2007, 7:27 PM   #8
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http://www.bobatkins.com/photography..._18_250_1.html

check the review for the 18-250.

some pictures from Pbase. Not mine, but pbase.

http://search.pbase.com/search?q=tamron+18-200&c=sp



there is also an option of sigma 18-125.

search for the same in Pbase. Pictures tell more answers than theory ))


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Old Apr 20, 2007, 8:31 PM   #9
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Thanks for the links...
I'm backing out og the 18-250 lens... (I always seem to confuse myself more and more by complexing things...)

ANYWAYS...
In those links nymphetamine sent in i did manage to stumble upon some good comparison shots of the Tamron 17-50 and Sigma 17-70.

Check it out: http://www.pbase.com/alexis/compare

I recomend opening the images from both cameras side by side for a good comparison. Seems to me, from these pictures, that the Sigma is SHARPER!

Now i'm really confused. The Tamron get's better scores, but from those pictures the Sigma seems sharper.:?

What's your opinion?
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Old Apr 21, 2007, 4:22 AM   #10
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It's a tough one which I went througha couple of times. I used to be a Konica Minolta 5D user and eventually settled on the 17-70 and then when switching to Canon I again went for the 17-70 as I was so happy with the performance and liked the range over the continuous 2.8 lenses.

What are you wanting to use the lens for as this is probably going to be the final decision maker for you? For me with a walk around lens the extra range was more important than the extra brightness. If you need f2.8 throughout then sacrifice the range and get the Tamron.

I guess I'm fortunate in that I have other options in my lens collection (Sigma 10-20, 17-70, Canon 50mm f1.8, 85mm f1.8, Sigma 70-200mm f2.8 and 120-300mm f2.8) so can make up for the brightness in other lenses and as you can see I'm pretty keen on the Sigma range.

Which ever lens you choose you will get good results (well as good as you can produce).

Happy shooting.
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