Small binocular question
I'm going backbacking in a dark location, and my regular binoculars are
in the shop, because I managed to get sand in them at the beach.
They're a bit heavy for backpacking anyway, so I decided to get a pair
of lightweight travel binoculars. So, yesterday I purchased a pair of
Nikon 9x25 Travelite binoculars. They are incredibly light, and the
daytime views seem fine. I had them out last night, though it was mostly
cloudy, to see what I could see. I noticed a very unpleasant and
distracting problem with these binoculars at night - a bright light that
is near but not in the field of view (a streetlight, say) creates an arc
or halo of reflected or refracted light across the field. Is this
normal or expected for this type of binocular? I have never noticed a
similar problem with full-size binoculars. Thanks in advance for any
comments -
ApprenticeRating: 0%, 0 votes
I think this is caused by a lack of shielding in front of the objective
(large front) lenses.
You may notice the objectives in the larger binos are set well back from the
front. A dark location will eliminate this, I'm sure.
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ApprenticeRating: 0%, 0 votes
lenses aren't adequately recessed.
sean nolan
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Some binoculars control stray light better
than better than others. The new Leica
8x20 and 10x25 have very good light control.
Rich
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ApprenticeRating: 0%, 0 votes
Every instrument I have ever seen exhibits this problem to
some degree, although the degree and the specific way the
problem is manifested varies wildly from one instrument
to another. In general, instruments with erecting prisms
such as binoculars are worse than instruments with fewer
surfaces, such as telescopes. It depends a lot on how well
coated the surfaces are and how well baffled and/or darkened
the walls are.
I wouldn't worry too much about it if you are planning to
use them in a dark environment; the only natural object
bright enough to cause problems along these lines in the
Moon (and the Sun, of course). However, the astronomical
potential of binoculars with 25mm objectives is *extremely*
limited. Basically useless for anything but the Moon,
seeing the moons of Jupiter, and maybe splitting a few
very wide double stars.
--
- Tony Flanders
Cambridge, MA
Sent via Deja.com #
Before you buy.
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ApprenticeRating: 0%, 0 votes
It sounds like a lenshood problem, easy to check by cupping your hands
around the objectives.
If this eliminates the problem, then given your intended dark-site
destination you should have no problem.
Alternatively, you could rig up some simple tubes or change them for a pair
with a larger integral lenshood/overhang.
Regards,
Kim.
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