1. The objective lenses range from 60mm to 120mm in diameter.
2. Magnification is around 20x.
3. Azimuth movement is generally 360 degrees.
4. Most are capable of obtaining a maximum altitude position of between 30
and 50 degrees.
5. Perfect thermal equilibrium is a given.
6. Those in the U.S.A. provide at least 90 seconds of viewing per quarter.

7. Perfectly dirty optics is the norm.....

jon