Bedienungsanleitung Celestron 21038 - Travel Scope 50 (Seite 11 von 100) (Deutsch, Englisch, Französisch, Italienisch, Spanisch)

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ENGLISH I 11

DETERMINING FIELD OF VIEW

Determining the ﬁeld of view is important if you want to get an idea of the angular size of the object you are observing. To

calculate the actual ﬁeld of view, divide the apparent ﬁeld of the eyepiece (supplied by the eyepiece manufacturer) by the

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

Apparent Field of of Eyepiece

True Angular Field =

________________________________

Magniﬁcation

As you can see, before determining the ﬁeld of view, you must calculate the magniﬁcation. Using the example in the previous

section, we can determine the ﬁeld of view using the same 20 mm eyepiece that is supplied standard with the Travel Scope

70. The 20 mm eyepiece has an apparent ﬁeld of view of 50°. Divide the 50° by the magniﬁcation, which is 20 power. This

yields an actual (true) ﬁeld of 2.5°.

To convert degrees to feet at 1,000 yards (which is more useful for terrestrial observing) multiply by 52.5. Multiply the

angular ﬁeld of 2.5° by 52.5. This produces a linear ﬁeld width of 131 feet at a distance of one thousand yards.

GENERAL OBSERVING HINTS

When using any optical instrument, there are a few things to remember to ensure you get the best possible image.

• Never look through window glass. Glass found in household windows is optically imperfect, and as a result, may vary in

thickness from one part of a window to the next. This inconsistency can and will affect the ability to focus your telescope. In

most cases you will not be able to achieve a truly sharp image, while in some cases you may actually see a double image.

• Never look across or over objects that are producing heat waves. This includes asphalt parking lots on hot summer days or

building rooftops.

• Hazy skies, fog, and mist can also make it difﬁcult to focus when viewing terrestrially. The amount of detail seen under these

conditions is greatly reduced.

Note: Your telescope was designed for terrestrial observation. Knowing how to use it for this purpose has been described

already as it is quite simple and straightforward. Your telescope can also be used for casual astronomical observing

which will be discussed in the next sections.

ASTRONOMY BASICS

Up to this point, this manual covered the assembly and basic operation of your telescope. However, to understand your

telescope more thoroughly, you need to know a little about the night sky. This section deals with observational astronomy in

general and includes information on the night sky.

THE CELESTIAL COORDINATE SYSTEM

To help ﬁnd objects in the sky, astronomers use a celestial coordinate system that is similar to our geographical coordinate system

here on Earth. The celestial coordinate system has poles, lines of longitude and latitude, and an equator. For the most part, these

remain ﬁxed against the background stars.

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