Ken Durling wrote:

> This fall I'm considering buying a "bird lens" in the $1500 range, so
> obviously I'm considering the 100-400IS, but I'm attracted to the idea
> of a fixed focal length lens.

I gotta think a zoom isn't all that useful as a bird lens--how often are you going to 
be close enough to get the shot you want at 100mm??  If it were me, at that price 
point I'd be looking hard at a 400/5.6L plus extender. As it is, for birds I have at 
least the 1.4x extender, and often the 2x extender, on my 300mm lens about 90% of the 
time, and too often it still isn't long enough.

Speaking of extenders, does anyone know first-hand which extension tube is necessary 
to couple the two EF extenders together? Is the 12mm tube thick enough?

Craig

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