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

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  1. tenex

    Telescope light transmission figures

    It's a good question. I think your intuition may be sound: transmission ends up lower for zoom eyepieces due to their complexity -- and I'd suggest also budget models like a CTC drawtube due to simpler coatings. Someone could measure it for top-quality scopes with prime eyepieces to confirm...
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