Has anyone used a Canon 70-200 f/4 with a teleconverter for plane-spotting?
Background: I've gotten rather into landscape photography (thanks, HDR guys...), and I'm considering trading in my 70-300 IS for a 70-200 f/4, which is a far better lens for that sort of thing. With a 1.4x teleconverter, the range would be similar...my in-store testing indicates that the quality is at about the same (a little better at the far end, a little worse at the near end).
Is this a terrible idea, or is it next on my rental list?
(I know there are a few people using 70-200 f/2.8s with 2x teleconverters, but for that kind of weight and money, I'd rather get a "real" super-telephoto lens.)
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