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LEFT Lens size, weight,
image stabilisation,
auto-focus, infrared
imaging – these are
all factors to consider
when buying a new set
of binoculars.FOG-PROOF & WATERPROOF FEATURES
Marine binoculars must of course be waterproof, as
well as being robust and cushioned against bumps.
But describing a pair as ‘waterproof ’ seems to mean
different things to different vendors (and conventional
marine IPX ratings are generally not listed for optics).
Check for a model that is completely immersible (i.e.
specified to be waterproof down to a certain depth, like
‘100 percent waterproof down to 3m’). You also want a
tough rubber or plastic casing that can withstand being
accidentally dropped or bumped hard.
Another feature to look for is ‘nitrogen-filled’. This
signifies that the body has been charged with nitrogen
gas. It stops the lenses fogging up internally in case of
sudden temperature changes. It also means that the
inside of your binoculars will have further protection
from corrosion.
Be aware however that most binoculars (marine
or otherwise) do not float, so either use a floating
binocular strap or some type of safety strap to prevent
an overboard accident.