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Sigma 10-20 can get as wide as 10mm but to get the exact point of view with Tokina 11-16, both lenses were set at 11mm.
At 11mm Sigma's widest aperture is F4.5 so in the first comparison, its compared to Tokina's widest aperture which is F2.8.
In the second photo, both lenses were at F4.5.
Then they are stopped down to F5.6, F6.3, F8 and F16 which is a common aperture in wide angle lenses.
All photos were taken with the same camera (Sony Alpha A-35) and with tripod + remote control.
I don't know if you'd agree with me but Sigma 10-20 is pretty interesting lens. Its significantly softer than Tokina 11-16 in wide apertures. One can even say its not sharp enough until you stop it down to F8. At F8, its as sharp as Tokina in the center but its still softer in the corners. However very untraditionally when you stop it down to F16, it becomes as sharp both in corners and in the center. Even at F16 Tokina has a little edge in corner sharpness but is very insignificant and I guess we are safe to say they are identically sharp.
F16's being a lens sweet spot is very uncommon so hopefully you'll agree that its interesting enough. :) [Review by Sinan Ozturk]
At 11mm Sigma's widest aperture is F4.5 so in the first comparison, its compared to Tokina's widest aperture which is F2.8.
In the second photo, both lenses were at F4.5.
Then they are stopped down to F5.6, F6.3, F8 and F16 which is a common aperture in wide angle lenses.
All photos were taken with the same camera (Sony Alpha A-35) and with tripod + remote control.
I don't know if you'd agree with me but Sigma 10-20 is pretty interesting lens. Its significantly softer than Tokina 11-16 in wide apertures. One can even say its not sharp enough until you stop it down to F8. At F8, its as sharp as Tokina in the center but its still softer in the corners. However very untraditionally when you stop it down to F16, it becomes as sharp both in corners and in the center. Even at F16 Tokina has a little edge in corner sharpness but is very insignificant and I guess we are safe to say they are identically sharp.
F16's being a lens sweet spot is very uncommon so hopefully you'll agree that its interesting enough. :) [Review by Sinan Ozturk]
| Comparison Photo # 1 |
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Photo_137Tokina 11-16mm f2.8 |
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Photo_131 Sigma 10-20mm. F/4-5.6 |
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 F2.8  1/2000  100  11mm. |
 F4.5 1/800100 11mm. |
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| Photo by Sinan Ozturk |
Photo by Sinan Ozturk |
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| Comparison Photo # 2 |
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Photo_138Tokina 11-16mm f2.8 |
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Photo_131 Sigma 10-20mm. F/4-5.6 |
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F4.5 1/800 100 11mm. |
F4.5 1/800100 11mm. |
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| Comparison Photo # 3 |
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Photo_139Tokina 11-16mm f2.8 |
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Photo_136 Sigma 10-20mm. F/4-5.6 |
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 F5.6 1/500 100 11mm. |
F5.6 1/500100 11mm. |
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| Comparison Photo # 4 |
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Photo_140Tokina 11-16mm f2.8 |
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Photo_135 Sigma 10-20mm. F/4-5.6 |
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 F6.3 1/400 100 11mm. |
F6.3 1/400100 11mm. |
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Login or Register to display 3 crops from Tokina 11-16mm f2.8 F/6.3 vs. Sigma 10-20mm. F/4-5.6 F/6.3 for locations Focus Point, Corner (Top Left), Center |
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| Comparison Photo # 5 |
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Photo_141Tokina 11-16mm f2.8 |
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Photo_134 Sigma 10-20mm. F/4-5.6 |
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 F8.0 1/250 100 11mm. |
F8.0 1/250100 11mm. |
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| 100% (1:1) Crop Samples | |||
Login or Register to display 3 crops from Tokina 11-16mm f2.8 F/8.0 vs. Sigma 10-20mm. F/4-5.6 F/8.0 for locations Focus Point, Corner (Top Left), Center |
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| Comparison Photo # 6 |
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Photo_142Tokina 11-16mm f2.8 |
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Photo_133 Sigma 10-20mm. F/4-5.6 |
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 F16.0 1/60 100 11mm. |
F16.0 1/60100 11mm. |
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| 100% (1:1) Crop Samples | |||
Login or Register to display 3 crops from Tokina 11-16mm f2.8 F/16.0 vs. Sigma 10-20mm. F/4-5.6 F/16.0 for locations Focus Point, Corner (Top Left), Center |
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