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

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    The Zeiss SFL 8x30 compared with select current 8x30/8x32 roof binoculars

    There's a hint suggesting stronger pincushion in the 8x30 than in the 8x40 found in the FOV specs (provided the Subjective Viewing Angle spec is an accurate measurement.) Notice that the difference in the Subjective Viewing Angles between the 8x40 and 8x30 is 5% (60º vs 63º), but the difference...
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    The Zeiss SFL 8x30 compared with select current 8x30/8x32 roof binoculars

    I don't know what the term "alpha" is supposed to mean. As it's used here it seems to mean a binocular that is accepted into an exclusive club with no questions asked as long as its label has the proper prestige and the price is high enough. Other binoculars that demonstrate equal or higher...
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    The Zeiss SFL 8x30 compared with select current 8x30/8x32 roof binoculars

    Allbino's problems with the credibility of their light transmission measurements seem to date mainly from the first few years after they began using a spectrophotometer. The Nikon 8x32 HGL transmission graph below on the left is an example of an improbable measurement from 2011. Notice that the...
  4. H

    The Zeiss SFL 8x30 compared with select current 8x30/8x32 roof binoculars

    Hi Tom, I changed the wording and added a diagram.
  5. H

    The Zeiss SFL 8x30 compared with select current 8x30/8x32 roof binoculars

    The size re The diameter of the ocular's eye lens results from two other specs: eye relief and AFOV, which form a cone with the height equal to the eye relief distance, the angle of the AFOV equal to the vertex angle and the eye lens diameter equal to the diameter of the base. There are many...
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