02-06-2011, 01:40 PM
Interesting review. Do you also plan to test it on APS-C?
My brother has a Canon 40D which he uses with an old Sigma 500/4.5 (the aperture doesn't work, so this lens can only be used wide-open), but he would prefer to use his K10D instead. The problem is that Pentax doesn't offer any long tele lenses, so he's quite limited to Sigma lenses. Would the 120-400mm on a K10D be a suitable replacement (for wildlife photography) compared to a 40D + 500/4.5 combination?
My brother has a Canon 40D which he uses with an old Sigma 500/4.5 (the aperture doesn't work, so this lens can only be used wide-open), but he would prefer to use his K10D instead. The problem is that Pentax doesn't offer any long tele lenses, so he's quite limited to Sigma lenses. Would the 120-400mm on a K10D be a suitable replacement (for wildlife photography) compared to a 40D + 500/4.5 combination?