Markitos wrote in post #6919575
Not questioning the validity of your choice, but I'm wondering why you chose the 400 f/5.6 over the 300 f/4 with the option of using a 1.4TC to get you to 400mm f/5.6. I'm just curious because these two lenses are on my radar, and I think I'd rather have the IS and the flexibility for the slight loss of IQ.
Again, please don't take my question the wrong way, I'm just curious because I'm looking at this lens, too.
Because 300mm is way too short for birding, and a TC should be an option, not a necessity. I don't need IS anyway because I either use a tripod or I shoot at 1/500s. Any slower and motion blur becomes a problem. I can also jack the ISO to get the shutter speed I need since 5D images are so clean.
I've thought about this decision for over a year. I mulled over the 400 5.6, 300 f/4 IS, and the 100-400L. In the end, the 400 won by a country mile. It's SO sharp wide open and the AF is just ridiculous.
Again, I intend to use this lens almost exclusively for birds. It was a no brainer.