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  1. A

    Wide flat field and edge sharpness an illusion?

    By the sweet spot I mean the percentage of the apparent field of view that is sharp. Normally the EII is like 60% of its field sharp, but stopped down, it was like 100%. It was like a dim NL Pure. Of course, because of this tiny exit pupil, proper eye placement becomes very important. If the ipd...
  2. A

    Wide flat field and edge sharpness an illusion?

    A couple of days ago I tried to stop down the objectives of my binoculars down to ~1cm to see if my IPD settings were fine (if you can't see with both eyes at the same time, it means the IPD is not properly set). I am aware that for my Nikon EII 8x30, the exit pupil of would be around 1.25mm...
  3. A

    Wide flat field and edge sharpness an illusion?

    I really wonder if back then (or even now), optical engineers took this into account when designing wide field eyepieces. Whenever you take a picture through the eyepiece (I tried with my Nikon EII and Aculon) all the field looks sharp and in focus when it is aligned with the optical axis...
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