Teleconverter

You are right on the rental cost. $84 per 5 days X 5 = $420. However, if I was going to spend 20% of the purchase price, I would just buy the zoom and after using it for a while decide whether to sell any of the primes. I use the 400mm f/5.6 a lot, and I almost always wish I had more reach. The zoom would likely be racked out to 400mm all the time anyway. The modest weight and fast focus of the 400 are hard to beat.
 
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nc0b said:
Rental cost for a 25 day trip, plus some shipping time each way, would equal the purchase price. Will just have to stick with the prime(s).

Another thought is that you are probably required to return the rental equipment in pristine condition, or at least in the condition you received it. When shooting outdoors, the next bump against some part of the environment is not far away, so that's another -1 for rented equipment beyond the price.
 
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I do know that one of the rental outfits has available "damage insurance" to cover just about anything that could go wrong.

The main suggestion about renting that 100-400II is that would allow you to leave the other similar lenses at home and maybe bring something else or two, that's all.

Have a nice trip :)
 
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