"Bart" wrote in message
oups.com...

Predators have their eyes on the front of their heads, while prey, have

eyes on the sides so they can be alerted to run away.


50 point Smackdown! Well done Bart. An ASA classic for the ages!

"Dave" wrote in message
...


Second, I find them useful during the day for a great deal other than
sight
seeing. Locating aids to navigation before they're visible to the naked
eye;
reading buoy numbers and otherwise identifying aids to navigation well in
advance; detecting the angle on the bow of approaching vessels; looking
for
whether there's an anchor line from the bow of that powerboat just off the
bow; getting a feel for the speed of commercial traffic--does it have a
bone
in its teeth; seeing ranges like the center span of the bride and the
submarine escape tower that shows the center of the channel in New London;
etc. etc.

Right you are.


Of course I'm not one of those navigators who thinks navigation consists
of
turning on an electronic display and gluing my eyes to it. YMMV.

Of course.

"Martin Baxter" wrote in message

All that light gathering will do no good if doesn't get transmitted due
to undersized prisms.

Coating is most important with prisms. You want to reduce loss of the
evanascent modes on the backside of the reflecting part of the prism.

"Scotty" wrote in message
...

some here don't even own a boat. Shocking!

At least I own a set of binoculars!

"Martin Baxter" wrote in message
...
Dave wrote:

On 19 Oct 2006 22:11:51 -0700, "Bart" said:

Name the two most characteristics to look for when shopping
for binoculars? [1 point each]

I'm surprised no one has mentioned light gathering capability. That's the
main reason the Navy uses 7X50s (or at least did in my day). They
provided
the best compromise of magnification and light gathering ability, coupled
with a field of view that was adequate on a moving deck.

Don't forget the diameter of the exit pupil, (objective dia./mag.),
should approximate the size of the pupil in the light conditions for
which you intend to use them. The 7X50s with a 7 mm exit diameter are a
fair compromise; the human pupil can open to about 9 mm in low light.
The typical 7X35 used by bird watchers have and exit pupil of 5 mm.

Cheers
Marty

Don't mules and asses have rectangular pupils?

"Gilligan" wrote
| Don't mules and asses have rectangular pupils?


Mules and asses teach school?


Cheers,
Ellen

http://www3.interscience.wiley.com/c...TRY=1&SRETRY=0

Gilligan wrote:

"Scotty" wrote in message
...

some here don't even own a boat. Shocking!


At least I own a set of binoculars!


I have two sets of binoculars. A cheap pair that I use for everyday
knocking about, and a really nice expensive pair that I keep on the
bottom of Lake Superior.

//Walt

"Gilligan" wrote in
message ...

"Scotty" wrote in message
...

some here don't even own a boat. Shocking!

At least I own a set of binoculars!


Just one? Hahah ha ha ha


ha

"Dave" wrote in message
news
On Fri, 20 Oct 2006 17:46:00 -0400, "Scotty"
said:

Just one? Hahah ha ha ha

Hey, I've been sailing for years and never needed more
than one. How many
eyes you got, Scotty?


6