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

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  1. Owlbarred

    AX Visio: is it really as bad as some reviewers claim??

    Thanks for the correct info on magnification. "Most birder here use focal lengths of 400-600mm to document observations. Some use even longer focal lengths." Whew! I've used Canon 600 mm f/4 IS and ISII lenses for 14 years. I don't know of any sane person on earth that carries a 600 mm lens...
  2. Owlbarred

    AX Visio: is it really as bad as some reviewers claim??

    Anyone who has spent time at a raptor autumn migration count site (there are more than 200 in the U.S.) -- where relatively few species are involved -- knows that even seasoned count-site experts disagree on occasion. A 10x AV photo could prove a useful tool for later examination. This is...
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