
Originally Posted by
Jayson
I too own the 50mm 1.4 and the 100mm macro(original flavor) and use my 85 mostly to get the kids playing in the back yard. For larger than 3 year olds, I believe it would make a great head and shoulders lens. I have been really looking at the 135mm L for some time, but I think that for my needs it would be a little long. I did the test with my 70-200 set at 135 and shot with it for a day. It was a little tight for everything I tried. I would do as suggested above and try shooting your 100-400 at 135 for a day and see if it works for you.
Jayson