good work Derek,writing this up,and the images too-all very helpful.
I'll be very keen to see your wildlife images in the future.
I am using the 400 L prime for a great deal of my wildlife stuff,and find it easy to get about.But-this Tamron-at that price,may have something to offer me in the future.I've seen the Sigma 150-500 in use by two people I know,and was not fussed on it.This Tamron lens appears a great value product.
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