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

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  1. S

    The topic of eye relief. What is it actually?

    I think we can be agreed that try before you buy is to recommend. Different designs of the eyepieces and sometimes untrustworthy stated values of eye relief makes it impossible to really know how well it works without trying.
  2. S

    The topic of eye relief. What is it actually?

    There is a thing worth to mention about the eye relief. I think everybody wants to see the entire FOV. But it's easy to think that it does not matter if you don't see the entire FOV if the AFOV is very big. For example comparing two binoculars with same magnification: a certain eyepiece provides...
  3. S

    The topic of eye relief. What is it actually?

    No, I have not tried to measure eye relief. However, based on the stated ER, different binoculars with the same stated ER still do not work equally well with glasses. One example: Zeiss Conquest HD 8x42 and GPO Passion ED 8x42. Both have the excellent eye cup design which makes the eyeglasses...
  4. S

    The topic of eye relief. What is it actually?

    Hi Andrew, I recently got a link in some thread about the relation between eye relief and eye lens size, but don't remember in which thread it was. What I understand there is a direct relation at least when comparing the same ocular design. This is very noticeable when comparing astronomical...
  5. S

    The topic of eye relief. What is it actually?

    During many years I have tried a lot of binoculars. Then I have experienced that the stated ER is often to take with a pinch of salt. Not only that the useful ER can vary a lot depending on the eyepiece design. While it needs to be a margin in order to prevent eyeglass lens and eyepiece lens to...
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