
Originally Posted by
ericbowles
I've got the 300 f/4, 200-400, and all the teleconverters. The 300 f/4 is all I want to handle for long durations handheld. I have tried the 200-400 but it is just a little too heavy without some sort of support. I've heard great reports on the quality of the 300 f/2.8 - but it is only slightly lighter than the 200-400. Earlier this year I spent 6 days on a pelagic birding trip where tripods were not effective so I have had plenty of time to try the various combinations. I retired the 200-400 after just an hour and used the 300 f/4 with the 1.4 teleconverter for more than 2500 images and 60 hours on deck.
For extra reach, the 300 f/4 works wonderfully with the 1.4 teleconverter. The 1.7 teleconverter is slow enough to make AF a little sluggish but it is still quite sharp. I don't like it with the 2.0 teleconverter - you just lose too much light for fast AF.
Now if you are willing to use a tripod, the situation changes. And it also depends on the size of the birds you intend to photograph.