03-14-2011, 10:22 PM
[quote name='Brightcolours' timestamp='1300115438' post='6759']
That is not really true, what you say. People who actually tried both lenses side by side always are more impressed with the IQ from the Sigma.
Try one yourself, if that is possible?
Sharpness wise... Funny enough on Pentax:
The Tamron is the worst performing here by far, a bit extreme. This Tamron clearly is not focussing correctly.
But it does match what people say who tried both (IQ of the Sigma better, and noticeacbly more contrasty). And it does show the Sigma to be plenty sharp!
http://www.pentaxforums.com/forums/penta...crops.html
Here a comparison that shows the exact same building scene, shot at the widest setting and wide open. The Sigma beats that Tamron sample by a big margin too.
http://www.dcfever.com/lens/readreview.php?id=2478
I don't own either lens myself, not a case of "my lens is better than yours".
[/quote]
Well, I've never tried the Sigma 18-50, but from this very website the IQ is not as good as the Tamron.
Also, the thread you point out on pentaxforums seems to be a case of FF issue.
The Tamron is generally considered to be one of the best f/2.8 standard zooms for sharpness. However it seems to be more prone to focus issues than the Sigma.
This being said, I know nothing of the new Sigma 18-50 with HSM. Perhaps they improved the IQ?
That is not really true, what you say. People who actually tried both lenses side by side always are more impressed with the IQ from the Sigma.
Try one yourself, if that is possible?
Sharpness wise... Funny enough on Pentax:
The Tamron is the worst performing here by far, a bit extreme. This Tamron clearly is not focussing correctly.
But it does match what people say who tried both (IQ of the Sigma better, and noticeacbly more contrasty). And it does show the Sigma to be plenty sharp!
http://www.pentaxforums.com/forums/penta...crops.html
Here a comparison that shows the exact same building scene, shot at the widest setting and wide open. The Sigma beats that Tamron sample by a big margin too.
http://www.dcfever.com/lens/readreview.php?id=2478
I don't own either lens myself, not a case of "my lens is better than yours".
[/quote]
Well, I've never tried the Sigma 18-50, but from this very website the IQ is not as good as the Tamron.
Also, the thread you point out on pentaxforums seems to be a case of FF issue.
The Tamron is generally considered to be one of the best f/2.8 standard zooms for sharpness. However it seems to be more prone to focus issues than the Sigma.
This being said, I know nothing of the new Sigma 18-50 with HSM. Perhaps they improved the IQ?