EF 300mm f/2.8L II + 2x III (with Canon 7D mk II) or...?

[Deleted member 7828]

^ won't speak for the OP but for me personally, too heavy and too expensive.

Looks like the 400 DO won't be available any time in the near future, which is just too bad...

Amazon say they have one

Ah interesting, they must have just got one in. last time I checked, they were saying 1-2 months.

 

[1982chris911]

^ won't speak for the OP but for me personally, too heavy and too expensive.

Looks like the 400 DO won't be available any time in the near future, which is just too bad...

Well OP considers the 600mm which is even heavier and also costs more ...
For my personal use I would also either take the 300mm or even the 200-400mm as I am not that much into birds.

 

[Hjalmarg1]

For birdding I would chose 300mm + 2X albeit of a decrease in IQ compared to the 600mm prime. The point is that for birdding, handholdability is critical for birds in flight, unless you want to concentrate on "semi-static" birds. Another factor is much better flexibility.