Mark,I found your post very interesting.I am still biased re the 20d ,but I am undecided as to which lens to keep on which cam.I do not like changing lenses as my grip is not very good,and yesterday almost lost the 1x4 converter in the river!!!.I use the 100-400 and the 300F4 IS with the 1x4 converter .Which lens would you suggest for which camera.Sorry ,the cams are 20d and 350d.I leave the ISO at 400 for the 300+1x4.It is said that the 20d is the better cam when using at a higher ISO,but do change to 800 if using the 2x,esp if not very bright sunlight.Is there any difference,or does it not matter.I suppose I could do a test with each,but very much doubt I would be any wiser.Just curious,if there would be an advantage to matching the lens with camera.It could be something to do with the focal range .One of these cams ,has I think an extended focal range,due to the size of the sensor?.
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