Re: averted vision when viewing in eyepiece
- From: Chris L Peterson <clp@xxxxxxxxxxxxxxxxxx>
- Date: Tue, 31 Jul 2007 13:32:53 GMT
On Mon, 30 Jul 2007 23:50:03 -0500, KLM <milk@xxxxxxxxx> wrote:
There is no "technique" involved if you have normal vision for our
species. In fact, the only technique is in understanding peripheral vision
is there, which everyone but amateur astronomers seemed
to understand already before this became a merit badge! Averted vision,
socalled, is simply an artifact of peripheral vision where detection of
motion in the peripheral field of view can be critical to survival.
Averted vision as used in astronomy is unrelated to motion detection in
peripheral vision. We have very high resolution, color vision only in
the very center of our FOV. That's normally where we keep objects of
interest located (a reflexive process that takes some practice to
bypass). This central part of our eye is largely useless for observing
in dim light (strong evolutionary evidence that we haven't been
nocturnal for a very long time!) Averted vision transfers a dim object
onto the region of the retina where rods are denser. Studying an object
for detail when it isn't in the center of your field is not a natural,
instinctual ability. It takes some practice.
Because this region of the retina is adapted to motion sensing, we can
sometimes use it to our advantage in _detecting_ a dim object, by
jiggling the telescope for instance. But that isn't the primary use of
averted vision.
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
.
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