Bedienungsanleitung Bresser 90-65000 National Geographic (Seite 9 von 32) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Spanisch)

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Focal width:

Everything that magniﬁ es an object via an optic (lens) has a certain focal width. The focal width is the length of the

path the light travels from the surface of the lens to its focal point. The focal point is also referred to as the focus. In

focus, the image is clear. In the case of a telescope, the focal widths of the telescope tube and the eyepieces are

combined.

Lens:

The lens bends the light which falls on it in such a way that the light creates a clear image at the focal point, after it

has traveled a certain distance (focal width).

Eyepiece:

An eyepiece is a viewing system comprised of one or more lenses. The eyepiece magniﬁ es the clear image gener-

ated at the focal point of a lens.

There is a simple formula for calculating magniﬁ cation:

Focal width of the telescope tube / Focal width of the eyepiece

= Magniﬁ cation

In a telescope, the magniﬁ cation depends on both the focal width of the telescope tube and the focal width of the

eyepiece.

Magniﬁ cation:

The magniﬁ cation corresponds to the difference between observation with the naked eye and observation through

a magniﬁ cation apparatus (e.g. a telescope). Observation with the naked eye is considered single, or 1x magniﬁ ca-

tion. Accordingly, if a telescope has a magniﬁ cation of 30X, then an object viewed through the telescope will appear

30 times larger than it would with the naked eye. Also see Eyepiece.

Useful accessories can be found at www.bresser.de

Possible objects for observation:

We have compiled and explained a number of very interesting celestial bodies and star clusters for you. On the

accompanying images at the end of the instruction manual, you can see how objects will appear in good viewing

conditions through your telescope using the eyepieces that came with it.

The Moon

The moon is the Earth’s only natural satellite.

Diameter: 3,476 km

Distance: approx. 384,400 km from Earth

The moon has been known to humans since prehistoric times. It is the second brightest object in the sky (after the

sun). Because the moon circles the Earth once per month, the angle between the Earth, the moon and the sun

is constantly changing; one sees this change in the phases of the moon. The time between two consecutive new

moon phases is about 29.5 days (709 hours).

Orion Nebula (M 42)

M 42 in the Orion constellation

Distance: 1,344 light years from Earth

With a distance of about 1,344 light years from the Earth, the Orion Nebula (Messier 42, abbreviation: M 42) is the

brightest diffuse nebula in the sky it is visible with the naked eye and a rewarding object for telescopes in all sizes,

from the smallest ﬁ eld glass to the largest earthbound observatories and the Hubble Space Telescope.

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