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Originally Posted by Christine
thanks,Nirofo,yes,that is interesting.The 1x4 will be all that is needed,as the 2.0 will lose too much light.But f.8 is not very good,so hopefully one may be able to drop the f stop down, to f.4 if this is possible.
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Hi Christine
If the 400 you're talking about is the Canon f5.6, then I think it's a very good lens capable of being used wide open at f5.6 with excellent results. A friend of mine has one and uses it regularly and successfully with a Canon 10D and a 1.4 Canon converter.
Have a look at this web page for more info.
http://www.photozone.de/8Reviews/lenses/canon_400_56/
nirofo.