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

diffraction spike

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    I'm somewhat new to birding and have a question about possible major defects on my spotting scope (see pictures). Kowa TSN-99a

    I purchased a binocular last year and have recently purchased a spotting scope, the Kowa TSN-99a. I did a lot of research into different scopes and this is what I settled on. I had read about lemons and cherries among optics. Tolerances in the manufacturing process. I was also curious how my...