NavList:

   

Reply

Dear Brad,

You wrote:

> When observing the bright object (sun, moon, planet, star) it should be 
centered in the optics.  I have scopes which have crosshairs to help insure 
the object is centered. 

By the way, crosshairs are only possible in Kepler scopes. Not in Galileo scopes.

You also wrote:

> From a brief investigation, I get that AR was commonly available from the 
1930's or 1940's.  I most certainly could be wrong about that, but it looked 
like a WW2 enhancement.

I do not remember an exact references, but I read somewhere that it was 
invented by Germans (Zeiss) shortly before WWII.
The main producer of Soviet optics after WWII was the company called LOMO 
(Leningrad optico-mechanical union)
which used German know-how and equipment. Lens of SNO-T telescopes were apparently made by LOMO.
 

>   What of all the sextants manufactured before AR?  Am I to understand that 
these devices are incapable of an observation?  Clearly they are not.

Certainly they are not. AR probably gives a slight improvement in twilight 
observations, better horizon visibility.
I think that after 1940s or 1950s all binoculars have AR optics.
 
 

Alex.

   

Reply