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

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    Any one used the Sigma 800/5.6 0r the 300-800/5.6?

    Steve, have owned both of these lenses, the 800 was the old non HSM version which made the focus too slow, upgraded to the 300-800 which was excellent as Kelvin says in his post (he bought mine) the only reason I sold was the weight issue as I am a birder first, photographer second (cant carry...
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