My point is that in the uk the 500mm is £8000 the 400 is £1100 and most of the time can be found for <£800 if 20% reach one stop and IS is worth £7000 extra... By learning a little more about the subject and also learning some hunting/tracking skills and wearing camo your images will be better, your arms and body not as tired and your wallet will be a lot larger.
Most of the time to get enough DOF With birds you shoot higher than F5.6.
I would probably look at bigger, but the weight puts me off especially for a full days shooting.
Never mind that. Where are the pictures from your Amazonian expedition ?
The expedition was incredible got some amazing pictures! One of the best experiences of my life. But I currently just have my iPad mini and was shooting small jpegs to my sd on the 5D so they look ok but haven't got round to editing them and still got another 2 months on the road! Would rather have a go with the full red RAWs before I post. But will post then when I get home. Taken nearly 13,000 images so far in the first 3 months so a lot to get through!
I will make a thread when I can
To add to the thread I took the 70-300mm L with me on the trip and 400mm would have been perfect. Or maybe taking a crop camera, wish I'd had that extra bit of reach. But because it was down season for 2 days it was just me and the ranger traveling through the tambopota forrest so we got very close and saw a lot of wildlife we probably wouldn't have seen with a large group. The 5D has been flawless and the lenses I've had it in -20C in the states and +50C in the Atacama desert then the moisture and rain in the rainforest not got one spec of dust in any of the lenses just a little bit of dust on the sensor. What a system, a lot of people really spend a lot of time worrying about the technical features but when you get out into these harsh environments it really proves how incredible they are, the 5D hasn't missed a beat and I haven't wanted more from it apart from maybe a couple of extra FPS. The 5DMKIII 24-105, 16-35, 70-300mm and 50mm has been such a great choice can basically do anything in any situation.
The canon system is amazing.
Sounds like a job for Photo Mechanic!