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

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  1. J

    Measuring the objective focal length

    For those who are interested in optics, here is a rather accurate method for measuring the focal length of the objectives in binoculars with an external focusing mechanism. The useful formula is : 1/F = 1/D1 + 1/D2 F is the objective focal length D1 is the minimum focus distance D2 is the...
  2. J

    Inside several old Zeiss binoculars

    I have found a Japanese page showing several cuts of old binoculars. Here is the translation in English : http://translate.google.fr/translate?u=http%3A%2F%2Fzeiss6.hp.infoseek.co.jp%2Frep-z06obk_opt03.htm&sl=ja&tl=en&hl=fr&ie=UTF-8 Without surprise, the first cut shows a very basic design, for...
  3. J

    disappointing sharpness with the 10x42 FL

    Hello I have read the review of the Zeiss FL by Kimmo Absetz on the Alula web site ( http://www.alula.fi/GB/index.htm ). According to my comparatively small experience with binoculars, I fully agree with ALL his statements. The point that holds my attention is that the 10x binocular he tested...
  4. J

    Hello everyone

    Hello My first interest is binoculars, I use them both for astronomy and daytime viewing, but not necessarily for birding. However, I think there is in BirdForum one of the best binoculars forums, which has been very useful in my choice of a new binocular. In return, I’ll try to share from time...
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