Bedienungsanleitung Celestron AstroMaster LT 76AZ (Seite 11 von 25) (Englisch)

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To align the Star Pointer ﬁnderscope:

1. To turn on the Star Pointer, turn the switch to the “on” position – see Figure 3-4.

2. Locate a bright star or planet and center it in a low power eyepiece in the main telescope.

3. With both eyes open, look through the glass window at the alignment star.

If the Star Pointer is perfectly aligned, you will see the

red LED dot overlap the alignment star. If the Star Pointer

is not aligned, take notice of where the red dot is relative

to the bright star.

4. Without moving the main telescope, turn the Star

Pointer’s two adjustment screws until the red dot is

directly over the alignment star. Experiment as to which

way each screw moves the red dot.

5. The Star Pointer is now ready for use. Always turn

the power off after you have found an object. This

will extend the life of both the battery and the LED.

Note: Your battery may be installed already. If not, open the

battery compartment – see Figure 3-4 with a thin coin or

screwdriver. Put the battery in with the “+” sign facing out.

Then put the battery compartment back on. If you ever need

to replace the battery, it is a 3-volt lithium type # CR 1620.

Note: The above description applies basically for astronomy. If your ﬁnderscope

is aligned properly, you can use it for terrestrial applications also. The ﬁnderscope

acts like a sighting tube. The red dot may be difﬁcult to see in the daytime but the

dot will let you align objects before looking through the main telescope optics and

can be quite helpful.

CALCULATING MAGNIFICATION

You can change the power of your telescope just by changing the eye-

piece (ocular). To determine the magniﬁcation of your telescope, simply

divide the focal length of the telescope by the focal length of the eyepiece

used. In equation format, the formula looks like this:

Focal Length of Telescope (mm)

Magniﬁcation =

Focal Length of Eyepiece (mm)

Let’s say, for example, you are using the 20mm eyepiece that came with your telescope. To determine the

magniﬁcation you simply divide the focal length of your telescope (the AstroMaster LT 60AZ for this example

has a focal length of 700mm) by the focal length of the eyepiece, 20mm. Dividing 700 by 20 yields a magniﬁ-

cation of 35 power.

Although the power is variable, each instrument under average skies has a limit to the highest useful mag-

niﬁcation. The general rule is that 60 power can be used for every inch of aperture. For example, the Astro-

Master LT 60AZ is 2.4” inches in diameter. Multiplying 2.4 by 60 gives a maximum useful magnication of

144 power. Although this is the maximum useful magniﬁcation, most observing is done in the range of 20 to

35 power for every inch of aperture which is 48 to 84 times for the AstroMaster LT 60AZ telescope. You can

determine the magniﬁcation for your telescope the same way.

Figure 3-5

Figure 3-4

Battery

Compartment

On/Off

Switch

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