Originally Posted by
beykirch
Hi Chris and Jay,
I am using the 400DO on both the 5D and the 5DII. The IQ of the 400DO is capable to deal with the 5DII sensor, no reason to step back from this lens.
The minimum focusing distance is 3.5m, the lens has a switch to limit it from 3.5m to infinity or from 7m to infinity. In Europe, I am happy when I must use the 3.5 - infinity setting, I never had a situation when 3.5m was not enough. That might be different in North America where the wildlife is much better approachable.
You cannot use a filter in front of the lens. All of the big telephoto lenses have the possibility to use drop-in filters (a plain one is included, because it is a part of the lens formula), Canon provides a polarizer.
Regards
Bernd