You also have to bear in mind that teleconverters can reduce AF speed by up to 75% so native is always better if the subject is erratic.
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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 ?
I also have bought the pro cube recharge dock from Hahnel, It recharges two Canon batteries and has a 2.1A USB charger on the back.That's one good looking charger! I travel with a handful of chargers - camera charger(s), AA/AAA/18650 charger, phone charger, laptop charger, GPS charger. And then you have all the associated cables. I'm sure there are better ways to do things. If you ever get your blog up, I'd be keen to hear how you managed with everything. There aren't that many sites or blogs that deal with the mechanics of travel photography - memory cards, storage, backups, editing on the road etc. Yet these seem to be regular topics for discussion on this site.