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

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  1. John A Roberts

    Swarovski NL Pure 8x32 vs CL Companion 8x30

    Hi Dr. K, Did you measure the total focuser travel from lock-to-lock, or from closest focus to infinity? The two can differ substantially, depending on the brand and model. For example, Canip (aka Pinac elsewhere) measured the excess travel beyond infinity as equivalent to around: 5 diopters...
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