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

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    What's wrong with the Zeiss Harpia??

    For astronomy a 200mm aperture Dobsonian is a much better alternative and much cheaper. Any good bird watching scope for nature watching. As to secondhand values, there is an immediate 30% drop when buying new optics, and in real terms after many years the value drops 90%. Optics are rarely...
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