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Hi Chris, I didn't read it that way, as we have all been involved in sorting out my approach to solving f/ratio / DOF / shutter speed / focus issues. I read it as two ideas in one sentence - busyness I suspect. But what you are saying is correct. f/2.8 is difficult to manage - for me anyway.
Still it's a very fine piece of optics for the price, and you won't be disappointed unless it doesn't suit your needs. Adding a 2x extender is an inexpensive increase in focal length, but I still have work to do testing the combination under outskirt suburban skies. For stationary birds the combination is as sharp as a tack.
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