I recently became interested in the above for my Canon DSLR's, having read a good report in Ametuer Photographer mag for a Canon USM lens. However have since found comparable lenses from Tamron and Sigma. They are:-
Tamron SP 10-24 SP AF Di i F3.4 to 4.5.
Sigma EX 10-20 F4- 5.6 EX DC
I would use it for scenery and close up ( ie static and museum)
Given the fact that I bought myself a Sigma 150-500 zoom earlier this year and have been blown away by the detail this lens brings out, not to mention the colours, I just want to know , who of you out there have had personal experience of these lens's and see which one you recommend etc.
Thanks and Regards