Artax - only the EOS 1DS has a full size-CMOS array (1x multiplier). EOS 1D (which is CCD) has a 1.3x multiplier, EOS D30/D60/10D have 1.6x multipliers. If you want a close to the DOF control that the 50mm gives you but for portraits, I'd probably go with the 85mm f/1.8. Yea, you lose some DOF control (it's like a .7-stop difference between the two), but it lets you get further back. For me, that's important as I don't want to invade the comfort zone of the person I'm shooting. But that could just be me. Enax - I couldn't believe when Canon came out with their 50mm f/1.0L pro lens. Saw a review where a guy was shooting handheld at dusk on a riverbank and the images were crisp. Yowza! :) -=>Donald