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

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  1. Y

    Have scopes nowadays Porro or Roof prisms?

    If a scope has porro prisms - like my Kowa TSN 663M Prominar. Is there any advantage with ED lens in the objective then? (Kowa use the term XD, but its the same). What I’ve learned CA is not an issue with porro.
  2. Y

    Have scopes nowadays Porro or Roof prisms?

    Thank you very much. Is this knowledge from a website or how do you know so much about scopes and prisms? I have Kowa TSN-663 M Prominar. Do you know the prisms on that? And what does the letter M stands for? Sincerely
  3. Y

    Have scopes nowadays Porro or Roof prisms?

    Hello! I have two Kowa TSN scopes (angled eyepiece) but I have no clue what type of prism it is inside. Porro or roof? I have searched on the sites from Zeiss, Swarovski, Leica, Kowa et c but I could not find any info. This group on birdforum has such a high level on scopeinformation so I am...
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