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Sigma 17-70 is set to 50mm for this comparison. At 50mm, its widest aperture is F4 so first comparison is with their lenses widest apertures (F4 vs. F2.8).
In the second comparison Sigma 50 is stopped down to F4.5 and in the third comparison both lenses were stopped down to F8.
As you can see from the photos, there is a very significant sharpness difference between Sigma 17-70 F.2.8-4 vs. Sigma 50mm 2.8 Dg Macro at 50mm. Sigma 50mm is a prime lens and moreover its a macro lens so its being sharper is normal. However I would expect a better performance from Sigma 17-70 at this focal length even if it falls behind. Unfortunately its no match regarding sharpness. Its center sharpness is not too bad and even if its still significantly behind Sigma 50, I guess most of us can still live with it. However in the corners its very weak and even stoppind down to F8 is not making any difference.
On the other hand the comparison also shows the color rendering difference between lenses. All photos are taken with the same camera (Sony Alpha A-35), with exact camera settings and under same lightining conditions so the difference between photos purely reflects lens' characteristics. The difference is clear I believe. Sigma 50mm tends to stand near blue color tone while Sigma 17-70 favors yellows a little more. If you zoom on the sky I guess you'll also agree with me.
I also think Sigma 17-70's sky rendering is worth mentioning. If you zoom around top right corner, you can tell Sigma 17-70 captured more tones of the sky in that area than Sigma 50mm. I guess this is also because of their color rendering characteristic, since Sigma 17-70 favoured yellows over blues, more subtle tones of sky appear with Sigma 17-70. I don't know if this justify its sharpness failure but still something. :-) [Review by Sinan Ozturk]
In the second comparison Sigma 50 is stopped down to F4.5 and in the third comparison both lenses were stopped down to F8.
As you can see from the photos, there is a very significant sharpness difference between Sigma 17-70 F.2.8-4 vs. Sigma 50mm 2.8 Dg Macro at 50mm. Sigma 50mm is a prime lens and moreover its a macro lens so its being sharper is normal. However I would expect a better performance from Sigma 17-70 at this focal length even if it falls behind. Unfortunately its no match regarding sharpness. Its center sharpness is not too bad and even if its still significantly behind Sigma 50, I guess most of us can still live with it. However in the corners its very weak and even stoppind down to F8 is not making any difference.
On the other hand the comparison also shows the color rendering difference between lenses. All photos are taken with the same camera (Sony Alpha A-35), with exact camera settings and under same lightining conditions so the difference between photos purely reflects lens' characteristics. The difference is clear I believe. Sigma 50mm tends to stand near blue color tone while Sigma 17-70 favors yellows a little more. If you zoom on the sky I guess you'll also agree with me.
I also think Sigma 17-70's sky rendering is worth mentioning. If you zoom around top right corner, you can tell Sigma 17-70 captured more tones of the sky in that area than Sigma 50mm. I guess this is also because of their color rendering characteristic, since Sigma 17-70 favoured yellows over blues, more subtle tones of sky appear with Sigma 17-70. I don't know if this justify its sharpness failure but still something. :-) [Review by Sinan Ozturk]
| Comparison Photo # 1 |
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Photo_181Sigma 50mm F/2.8 DG Macro |
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Photo_183 Sigma 17-70 F/2.8-4 DS Macro HSM |
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 F2.8  1/1250  100  50mm. |
 F4.0 1/640100 50mm. |
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| Photo by Sinan Ozturk |
Photo by Sinan Ozturk |
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| Comparison Photo # 2 |
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Photo_180Sigma 50mm F/2.8 DG Macro |
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Photo_183 Sigma 17-70 F/2.8-4 DS Macro HSM |
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 F4.5 1/500 100 50mm. |
F4.0 1/640100 50mm. |
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| Comparison Photo # 3 |
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Photo_182Sigma 50mm F/2.8 DG Macro |
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Photo_184 Sigma 17-70 F/2.8-4 DS Macro HSM |
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 F8.0 1/160 100 50mm. |
F8.0 1/125100 50mm. |
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