Quote (Antichrist- @ 19 Nov 2010 15:01)
you dont want to use 28mm for close up portraits, maybe just barely with 1.6crop camera..
get a adapter with focus confirmation chip if you need to, viewfinder on 5d is totally from different world than what you got now, so you may not even need that, especially if you get a split-image or microprism viewfinder screen.
i dont really get whats so bad on stopping down the lens before shooting, only downside i see in it is that viewfinder gets slightly darker. when using live view, it compensates the darkening and you can see what dof you get. also when you change the aperture from the lens, you can put iso on the wheel(not sure if you can do this with 5d mkI, but i bet you can change this with mkII) and you can control everything without pushing any buttons. actually with macros i prefer a lens where you can change the aperture from it since i like to shoot with live view and i can see the dof all the time.
what contax lenses you have?
I own Planar 50 1.4 and I have tested 100 f 3.5. Both perform well but it is hard to focus precisely, adapters with focus confirmations are not very precise for what I heard. Plus, all the old wide contax lenses have problems with the mirror on 5D and 5DII.
http://www.pebbleplace.com/Personal/Contax_db.htmlIn the end, 100 mm is OK for me and I own it so it is easier to keep if I stay with Canon. 28 mm is a good focal lens on full frame imo coz it is not too wide and distortion is well controlled.
Close up are not first use ofc, it is only a good feature to have. T aperture seems very nice there so in low light, at 3200 ISO af F2 I should be able to shoot in most occasions
5DI has not liveview btw.
The point is, D700 and 5DII are not convincing me completely, so I like the idea of spending in lenses too (as I have no wideangle atm) and to wait for a new model to be released but with a full frame in my hands. That is why I am considering 5DI.