I just bought one for $20 at a yard sale. d=60 X f=800m
FOV means Field Of View of a telescope. =]
field of view
A transit-circle is the main instrument used for that. It is a telescope mounted on an east-west axis so that it moves only in the meridian plane. Stars and other objects cross the meridian and when they do that they move across the field of view of the telescope. The time at which they do that indicates their right ascension, and the angle of the telescope indicates their declination. So the astronomer sits at the transit circle with a stopwatch and when the star goes across the centre of the field of view the time is noted on the stopwatch.
It really depends on what you mean by good. My camera tripod holds a small telescope and it is 'good'. It cost about $200. My telescope tripod holds a 12 inch telescope and the tripod cost about $1500. It has built in GPS. That is 'good' too. But if you go to a mount by a company called Ascension, you can pay over $35,000! That is GOOD!
Helium, Hydrogen (elements in stars and planets). Hubble (astronomer and telescope). Hercules (constellation) Heliocentric theory. Hypergiant (star). HR diagram.
need value of western field model 880a-ech 22 long rifle
age an value m550al
I just got a western field 410 shotgun and wondering the value of It
190.00
i have a wards western field m #30 - sbv5662a
Your Western Field shotgun has a value of between 35-90 dollars.
The value of a Western Field model 37 EMJ shotgun will vary depending on the condition. The prices start at an estimated $225.00.
The Western Field model 550C was manufactured by Mossberg for Montgomery Wards.
The Montgomery Ward Western Field model 712 is a common bolt action rifle. It doesn't have an enormous value of about $200 to $350.
I bought my 1969 western field tent trailer for $50.00
308 cal and made in Germany
$100-$150.