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I have 4 Sigmas (10-20 EX, 18-50EX, 28-300, 400 f5.6) and 1 Tamron (90mm macro).

I would like to get something to fill the gap between 300 and 400mm, and I am thinking of the Sigma 170-500.But I would also like the Minolta/Sony A/F 500 mirror.

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Hi Gordon, my thoughts would run to a Tamron 55-200/4-5.6, (very cheap but good) and a S/H Tamron 200-400/5.6, for the Mirror look out for a S/H Sigma 600/8. The 20-400 is a tad lighter than the Siggy 170-500 and is a constant 5.6 and scores about the same on the Dyxum reviews. Help the budget by ditching the 28-300 and possibly the 400/5.6.

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