You guys are killing me. Especially you, Colin with your amazing shots taken with your 70-200 f2.8L IS II USM plus teleconverter 1.4 or 2.0.
A month ago I asked on a couple other forums and the general consensus was to get a 100-400mm f4.5-5.6L IS USM for an upcoming trip this summer to Juneau Alaska. I was actually steered away from the 70-200 plus TC package by some experienced photographers who know others who stated that when they needed the 400mm reach, it was good, but when they quickly needed a shorter length, disconnecting the TC and reassembling their camera proved to be too cumbersome and lead to lost shot opportunities. (wildlife & airshow pictures)
I checked out one of the Juneau photo tours and they recommend at least a 400mm reach and a fast lens due to oftentimes experiencing low light conditions.
I have a T2i and EF-S 18-135mm at this time with future plans to upgrade to full frame. The cheapest way around this (and a happier wife) is to just get the 100-400mm for now at half the cost of the 70-200mm & TC. L A T E R, I would purchase a 70-200mm 2.8 lens. But what Im reading in the recent threads about others debating the 70-200mm lenses has me wondering if I need to put more focus on the 2.8L IS rather than the 4.5-5.6L IS that come with the 400mm lens?
So my main questions are...
1) can I get away with good, decent shots with the 4.5-5.6L IS or should I really be considering the 2.8L IS thats on the 200mm lens for Alaska?
2) Is it really an issue changing out of the TC on the 70-200mm lens?