I am currently considering 2 UWA lens for my 10D as follows:
1) Sigma 15-30mm f3.5-5.6
2) Canon 17-40mm f4 L
The comments and reviews about the above 2 are good, especially the Canon. However, I have not seen any comparisons of the 2 side by side.
I like the Sigma for the 2 extra mm (3.2mm for 10D), sharpness at WA. Dislike it because huge and no suitable filter.
I like the Canon because it is f4 throughout, good build and weather-resistent. Maintain sharpness throughout. However, I lose the 2mm compared to Sigma.
Please note that I have not tested the lens, the likes/dislikes are based on extensive search in multiple forums and reviews.
My questions to you kind folks are:
1) Should I be greedy on the 2mm since the prices of the 2 lenses are only USD100 different?
2) Someone suggested I can technically "recover" the 2mm by taking shots a few steps back - Is this correct or is he pulling a fast one?
If anyone has done a comparison, with pics, on these 2, I would love to hear from you cos I need my UWA soon.......