CALCULATING POWER
The power, or magnification, at which a telescope is operating is determined by two factors: the optical, or focal length of the telescope’s main (objective) lens and the focal length of the eyepiece being used.
The focal length of the Telestar
Power = 600mm ÷ 25mm = 24X
Similarly, if the 6mm eyepiece is used:
Power = 600mm ÷ 6mm = 100X.
A few words about power. While the theoretical power or magnification of a telescope is virtually limitless, there are, however, practical limits imposed by the Earth’s atmosphere as to what can be seen well at a given power. The most useful higher magnification with any 40mm diameter telescope is in the range of 24 to 100 power.
The general rule regarding power: Only use as much magnification as supports a steady,
MAINTENANCE
The
SPECIFICATIONS
Objective (main) lens focal length . . . . . . . . . . .600mm
Objective lens diameter . . . . . . . . . . . . . . . . . . .40mm,
Viewfinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2x
Mounting type . . . . . . . . . . . . . . . . . . . . . . . . . . .Altazimuth
Eyepieces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25mm, 6mm
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24X, 100X