
Originally Posted by
MeatPuppet
Personally, I would go with the 20D/17-55 and leave the grip at home. I have been faced with similar situations several times in the past and I have always chosen to take my dslr and never regretted it. I bough it for a reason and leaving it at home kind of defeats the purpose.
I have had really good success with li-ion batteries in the cold. I pack most of my batteries in my pack and keep one in an inner pocket to keep it warm. When I am ready to shoot I put that battery in the camera, shoot, and then put it back in my pocket to keep it warm until I am ready to shoot again.
AFAIK the storage temperature of the batteries is irrelevant. It's just the temperature of the batteries as they are being discharged that is important.
The last tip I took was to Yellowstone in May, for 5 days. I took four batteries and ended up using the same one the entire time. I took 400+ pictures, equally split between jpeg and RAW, including one 20min exposure at 3am when the temp was in the upper teens.
Buy four or five extra Li-ion batteries, leave the grip at home. You won't notice the extra 1/2 kg, but you will be looking at the pictures for a lifetime.
My $.02
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