Bresser National Geographic 70/400 Mode D'emploi page 20

Smartphone holder (For eyepieces)
Open the flexible holder and put your smartphone in it. Close the holder and make sure your phone is
properly secured. The camera must be positioned exactly above the eyepiece. Open the locking clip on the
back of the holder and fit the eyepiece exactly onto your smartphone camera. Now retighten the locking
clip and attach the smartphone adaptor to the eyepiece of your telescope. Now start the camera app. If the
image is not yet centered on your display, loosen the locking clip slightly and readjust. It may be necessary
to use the zoom function to fill the image on the display. A slight shading at the edges is possible. Remove
the smartphone from the holder after use!
WARNING
Make sure that the smartphone can not slip out of the holder. Bresser GmbH assumes no liability for any
damages caused by a dropped smartphone.
Telescope ABC's
Focal length:
Everything that magnifies an object via an optic (lens) has a certain focal length. The focal length is the
length of the path the light travels from the surface of the lens to its focal point. The focal point is also refer-
red to as the focus. In focus, the image is clear. In the case of a telescope, the focal length of the telescope
tube and the eyepieces are combined.
Lens:
The lens turns the light that 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).
Amici Prism (diagonal) (3):
Barlow Lens (4):
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What do the following terms mean?
A roof prism that redirects the light beam at a right angle. With a horizontal te-
lescope tube, this device deflects the light upwards so that you can comfortably
observe by looking downwards into the eyepiece. The image appears upright and
laterally correct through an amici prism.
The Barlow lens can be used to increase the focal width of a telescope.