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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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    Tamron 200-500mm vs. Sigma 50-500mm DG

    Hi Beth I have the K10D and the 50-500 Bigma.It is great in good light but can hunt a bit in not so good light it is also a a heavy lens to cart about.I have had some great pics and also been a little disillusioned with others and wonder if I should have saved up a bit more and a 300 f4 and then...
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