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

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  1. 4

    Spotting scope aperture and heat waves. Seeing?

    I asked a similar question last year. How can 60mm be better than 80mm (help needed)? In post #10 of that thread I described one situation where the smaller scope was definitely better than the larger scope, however I have not been able to repeat it since. That one situation was really bad...
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