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PostPosted: Sat May 29, 2010 1:46 pm 
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Hi there,
Does anybody know which of these ones gives the best IQ?
It's about the Sigma 18-50mm F2.8 EX DC MACRO and the Tamron SP 17-50mm F/2,8 XR Di II LD ASL IF?
The F/2.8 troughout the range is excelent, and for buying probably a 50D, which needs a sharp lens.
I was thinking about the Cannon 17-85, but it isnt sharp enough for the 50D.
Could you help me?

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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: Sat May 29, 2010 4:04 pm 
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I would bet my money on the Sigma 17-50mm F/2.8....it should be as sharp as the Tamron & plus,a very fast focusing & motor.

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PostPosted: Sat May 29, 2010 4:21 pm 
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The Sigma 17-50 is almost twice as expensive as the Tamron.
Those are really the most expensive I shall effort.

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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: Sat May 29, 2010 4:36 pm 
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I think the Tamron is sharper, but the Sigma focuses faster. Check photozone or something.

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PostPosted: Sat May 29, 2010 5:08 pm 
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Well, what do you think is better?
Sigma Tamron
1:3 vs 1:4,5 macro
20cm vs 27cm closest focus
better build-less good
good IQ vs very good IQ
19,5mm vs 17mm

As said itll be fitten on a 50D, I think.
The 50D needs a good quality lens, but for compensating the good build of the 50D, the lens may also be ''better built''.
On the one side, the better IQ from Tamron (close to 17-40 L) will fit me better than less good IQ of course. But the build Quality, and that ''macro'' mode is also nice.
But, when you fit a close-up filter at the Tamron, youll get nice macros too, right?

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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: Sat May 29, 2010 5:45 pm 
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correct, but those also don't come cheap, and you lose infinity focus if you have it on.

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PostPosted: Sat May 29, 2010 6:33 pm 
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sorry,I forgot that the new Sigma lens is pretty expensive.
I vote for the Tamron,the better sharpness wins every time for me. And if you want a true macro lens,save some money later for the Tamron 90mm or the Canon 100mm. The "macro" mode on the Sigma 18-50mm is not that hot once you try it. The most important thing is the wide angle.

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PostPosted: Sat May 29, 2010 8:54 pm 
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Thanks guys!
Then the last point: The build quality of the Sigma is like its high end lenses, so really good. But the Tamron I cant find anything about the build (or built?!) quality. And the focus speed: Is the Tamron fast too?

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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: Tue Jun 08, 2010 8:55 am 
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Don't mistake the build quality of the Sigma 18-50 with the other EX lenses! The 18-50 is the worst of them, it's about as good as the 17-70! The Tamron is more or less the same, in my opinion even a bit better!

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PostPosted: Thu Jun 10, 2010 6:52 pm 
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Thanks :wink:
Now it's only fast vs quiet focussing.

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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: Fri Jun 11, 2010 12:51 am 
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Fast, the whirr of a focus motor is pretty smooth compared to the thunderclap of the mirror slapping up ;)

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PostPosted: Fri Jun 11, 2010 6:06 pm 
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That's right too :wink:

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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: Mon Jun 28, 2010 8:27 am 
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You can check my comparison test on Slovenian Pentax site (Pentax 16-50, Sigma 18-50 and Tamron 17-50).
Text is in slovenian language, but pictures have labels (first picture is always Pentax, then Sigma, last Tamron)...
http://servis-doma.net/pentax-forum/vie ... ?f=11&t=25

If you want some more explanations, ask.


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PostPosted: Tue Jun 29, 2010 5:14 pm 
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Thanks!
If I understand it, the Sigma has a bit better optical quality, but more CA?
Welcome at Cameralabs though!

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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: Wed Jun 30, 2010 7:22 am 
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Thanks for the welcome!

A quick explanation of test results:

Point 1) Build quality: Pentax the best, Sigma second, Tamron third

Point 2) Comparison of wide (Tamron is wider then Sigma)

Point 3) Sharpness (wide open):
a) Wide end (17-18mm): Sigma was the sharpest wide open, at least in centre. But the sharpness of Sigma falls a little bit toward the edges. Tamron is less sharp but a little more consistent on whole frame.

b) At 30mm Sigma still the sharpest, no more sharpness fall-off

c) At 50mm situation changes - Tamron was the best of all.
(At the bottom is comparison to fixed Pentax FA50/1.4 lens @F1.4 and @F2.8 )

Point 4) PF and CA is about the same at both Sigma and Tamron.

Point 5) Colors (as usual) a bit cold on Tamron and a little on warm side at Sigma. This characteristic is perhaps more obvious on human skin and green leaves outside then on those test photos.

Point 6) Ghost and flare characteristic. Simmilar subjections but different shapes.

Point 7) The shape of bokeh at 50mm wide open. For my taste, the Sigma`s bokeh is the smoothest, but not big differences.

Point 8 ) Vignetting - since all of them are intended for crop sensor, they all suffer from it a little bit.

Point 9) Minimal focusing distance: Sigma was the clear winner here since it also carries the "Macro sign".

Sigma and Tamron were previous generation of lenses - Sigma without HSM and OS and Tamron without VC (on Pentax we don`t miss them much...).


Last edited by Fantocci on Wed Jun 30, 2010 8:02 am, edited 4 times in total.

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