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5
Telescope ABC’s
What do the following terms mean?
Diagonal:
A mirror that deflects the ray of light 90 degrees. With a horizontal
telescope tube, this device deflects the light upwards so that you can
comfortably observe by looking downwards into the eyepiece. The
image in a diagonal mirror appears upright, but rotated around its
vertical axis (mirror image.)
Focal Length:
Everything that magnifies an object via an optic (lens) has a certain
focal length (FL). The FL 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 FL of the telescope tube and the eyepieces are
combined.
Lens:
The lens turns the light which falls on it around in such a way so that
the light gives a clear image in the focal point after it has traveled a
certain distance (focal length).
Eyepiece:
An eyepiece is a system made for your eye and comprised of one or
more lenses. In an eyepiece, the clear image that is generated in the
focal point of a lens is captured and magnified still more.
There is a simple formula for calculating the magnifications:
Focal length of the telescope tube / Focal length of the eyepiece =
Magnification.
You see: In a telescope, the magnification depends on both the focal
length of the telescope tube and the focal length of the eyepiece.
Magnification:
The magnification corresponds to the difference between
observation with the naked eye and observation through a
magnification apparatus (e.g. a telescope). In this scheme,
observation with the eye is considered "single", or 1x magnification.
Accordingly, if a telescope has a magnification of 30x, then a object
viewed through the telescope will appear 30 times larger than it
would with the naked eye. See also, "Eyepiece"
Troubleshooting:
Mistakes: Help:
No picture
Remove dust protection cap and sun-
shield from the objective opening.
Blurred picture
Adjust focus using focus ring
No focus possible
Wait for temperature to balance out
Bad picture
Never observe through a glass surface
Viewing object visible
Adjust finder
in the finder, but not
through the telescope
Despite using star
The star diagonal prism
diagonal prism
should be vertical in
the picture is "crooked" the eyepiece connection
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DISPOSAL
Dispose of the packaging materials properly,
according to their type (paper, cardboard, etc).
Contact your local waste disposal service or
environmental authority for information on the
proper disposal.
Please take the current legal regulations into
account when disposing of your device. You can
get more information on the proper disposal
from your local waste disposal service or
environmental authority.
