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

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  1. W

    What determines the field of view for the same magnification and objective lens?

    The field stop may be a physical aperture or the physical edge of the tube/a lens, you can’t remove it as something else will then act as the field stop. Something has to define the edge of the field…. The only case where there isn’t is when you are not looking though any optics! Sometimes the...
  2. W

    What determines the field of view for the same magnification and objective lens?

    Might be the visible field width you see when you look in. The actual field stop is a circular hole somewhere inside or at the bottom of the eyepiece that is what you are seeing as the edge of the field when you look through the eyepiece. Wide angles with long eye relief need to have huge eye...
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