Boating New Zealand — December 2017

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Also, they are much heavier in the bigger magnifications
and also consume batteries, with some models going
through these at an alarming rate.
Bottom line – if you can afford the hefty price tag, and
are prepared to look after it properly, an image-stabilised
pair will give you the highest magnification. But for most
recreational boaties they are probably hard to justify.

OBJECTIVE LENS SIZE
The second number specified in a binocular spec is the size of
the objective lens, which is the lens furthest from your eyes.
Large objective lenses gather more light, which will result in
a brighter and clearer image. This is particularly important
if you plan on using your binoculars during early morning,
dusk or night-time.
Larger lenses mean bulkier and heavier binoculars.
Since you’re not usually carrying it any distance, the weight
is less of an issue, but holding it for long periods of time
can be tiring on your wrists. Most marine binoculars have
objective lenses of 30mm to 50mm.

FOV OR FIELD OF VIEW
The FOV – also called the Angle of View – is the horizontal
measure of what you can see when looking through your
binoculars, and can be specified either as a number of
degrees or a measurement in metres at 1000m.
For example the Minox BN 7x50 DC Nautic marine
binoculars has a field of view of 123m at 1,000m (or 7.1°).

ABOVE Light, compact and
easy to handle – less chance
of your wrists getting tired.

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