Hawke Optics 8x32 Frontier HD X Binoculars (Gray) User Manual
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04 | Exit Pupil
The diameter of the viewing image when the eye is
positioned at the correct eye relief. This is calculated
by dividing the objective lens diameter by the
binocular magnification. e.g. for a 10x42 binocular
we divide the objective lens diameter of 42mm by
the magnification power of 10 to get 4.2mm.
05 | Interpupillary Distance
The distance between the two ocular lenses.
This is measured from the middle of one lens to the
other. The interpupillary distance has a range, as the
distance will change depending how open or closed
the binoculars hinge is set.
06 | Eye Relief
The correct distance for the pupil to be located from
the ocular lens. When at this distance the best viewing
experience will be achieved. All Hawke binoculars
are fitted with adjustable twist-up eye cups to help
gain the correct eye relief distance and comfortable
viewing experience. (see page 8)
07 | Close Focus
The closest possible distance that the binoculars can
be focused at. Binoculars with an ability to focus at
close range allow for better viewing of nearby objects
such as insects.