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

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  1. tjd

    Example with a 90mm Maksutov-Cassegrain type scope

    lack of contrast I agree that the images on the web-site taken by the Mak. Cass. do suffer from a certain dullness/flatness. . The reason behind the particular glare that causes the...
  2. tjd

    Example with a 90mm Maksutov-Cassegrain type scope

    The main problem with reflecting scopes rather than refractors, from my experience, is that they hve less contrast, and more glare when used terrestially, compared to a refractor. This is because of two main reasons. 1/.... a small decrease in contrast and resolution is caused because reflecting...
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