Hi I presently use an EOS 10 (not D) and I love it; well I love it again now that I had the shutter bumpers replaced last year. I am looked for 'longer reach' with a quality lens and have been considering either the 100-400 or the 70-200 (the latter with occasional use of a 2x MkII).
A head-head review of these combinations can be found by typing '400v400' into Google. Not surprisingly the 100-400 came out tops at the 400mm end. Obviously there are many parameters to consider - each will have its own pros/cons. In my thinking I am planning for an upgrade sometime soon-ish to digital - possibly the 10D. So here is what seems to me to be an important consideration - dust. The 70-200 has a 'sealed' rear element and all focusing/zooming goes on internally. The 100-400 on the other hand has an 'open back' construction so that it blows/sucks like a balloon pump when push-pull zoomed; presumably injecting air/dust into the camera body. I have read lots of traffic about dust on digital sensors - so it seems that the type of construction used in the 100-400 is really unsuitable for digital cameras - at least if you have another option - take it. What do folks think? Is this a big deal or not? Thanks, Steve * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
