Manual Celestron 21038 - Travel Scope 50 (page 10 of 100) (English, German, French, Italian, Spanish)

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10 I ENGLISH

TELESCOPE BASICS

FOCUSING

To focus your Travel Scope turn the focus knob located near the rear of the telescope (see Figure 1). Turning the

knob counterclockwise allows you to focus on an object that is farther than the one you are currently observing.

Turning the knob clockwise from you allows you to focus on an object closer than the one you are currently observing.

Note: Remove the front lens cap of the Travel Scope optical tube prior to attempting your observation.

Note: If you wear corrective lenses (speciﬁcally glasses), you may want to remove them when observing with an eyepiece

attached to the telescope. If you have astigmatism, corrective lenses should be worn at all times.

Focal length of Telescope (mm)

Magniﬁcation =

_____________________________

Focal length of Eyepiece (mm)

INSTALLING AND USING THE BARLOW LENS (TRAVEL SCOPE 50 ONLY)

Let’s say, for example, you are using the 20mm eyepiece that came with your Travel Scope 70 telescope. To determine the

magniﬁcation you divide the focal length of your telescope (the Travel Scope for this example has a focal length of 400mm)

by the focal length of the eyepiece, 20mm. Dividing 400 by 20 yields a magniﬁcation of 20x.

Although the power is variable, every telescope under average skies has a limit to the highest useful magniﬁcation. The

general rule is that 60 power can be used for every inch of aperture. For example, the Travel Scope 70 is 2.8” inches in

diameter. Multiplying 2.8 by 60 gives a maximum useful magniﬁcation of 168 power. Although this is the maximum useful

magniﬁcation, most of your observing will be done at low powers which generate brighter and sharper images.

Note on Using High Powers– Higher powers are used mainly for lunar and sometimes planetary observing where you can

greatly enlarge the image, but remember that the contrast and brightness will be very low due to the high magniﬁcation.

When using the 8mm eyepiece together with the 3x Barlow lens with the Travel Scope 50 gives extremely high power and

can be used on rare occasions – you will achieve the power but the image will be dark with low contrast because you have

magniﬁed it to the maximum possible. For the brightest images with the highest contrast levels, use lower powers.

You can purchase optional eyepieces to give you a range of powers you can observe with. Visit the Celestron website to see

what is available.

Your telescope also comes with a 3x Barlow Lens

which triples the magnifying power of each eyepiece.

However, the greatly magniﬁed images should only

be used under ideal conditions – see the Calculating

Magniﬁcation section of this manual. To use the

Barlow lens remove the diagonal and insert the

Barlow directly into the focuser tube. You then insert

an eyepiece into the Barlow lens for viewing.

Note: Start by using a low power eyepiece as it will

be easier to focus.

CALCULATING MAGNIFICATION

You can change the power of your telescope just by changing the eyepiece (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:

3x Barlow Lens

Fig. 13

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Celestron 21038 - Travel Scope 50 Manual

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