Bresser NATIONAL GEOGRAPHIC 76/350 Instrucciones De Uso página 8

The magnification is also depends on the focal width of the telescope tube. The telescope has a focal length of 350 mm.
From this formula, we see that if you use an eyepiece with a focal width of 20 mm, you will get the following magnifica-
tion:
350 mm / 20 mm = 18X magnification
The table below shows some common magnifications.
Telescope tube
focal width
350 mm
350 mm
Smartphone holder
X
B
fill out the whole screen of your smartphone. The suction cups must be dry, clean and free from all kinds of dust and dirt.
We assume no responsibility for dropped and broken smartphones due to incorrect handling.
Astronomy Software Download
www.bresser.de/download/Stellarium
NOTES on cleaning
• Clean the eyepieces and lenses only with a soft, lint-free cloth, like a microfibre cloth. Do not apply excess pressure to
the cloth to avoid scratching the lenses.
• To remove more stubborn dirt, moisten the cleaning cloth with an eyeglass-cleaning solution, and wipe the lenses
gently.
• Protect the device from dust and moisture. After use, particularly in high humidity, let the device acclimatize for a short
period of time, so that the residual moisture can dissipate before storing. Remove the dust cover and store it in the
included bag during use.
• To remove dust on the mirrors, use a fine brush or air blower (from your local camera shop or optician). Don't touch
any mirror surface with your fingers — they may damage the coating.
DISPOSAL
• Dispose of the packaging materials properly, according to their type, such as paper or cardboard. 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.
8
Focal width of eyepiece
20 mm
6 mm
X
Y
C
Magnification
18X
58X
Insert the eyepiece (1) into the smartphone holder and
tighten the screw (X) to the bracket firmly. Then set the
smartphone holder with the eyepiece into the eyepiece
connection (2) and tighten the clamping screws (Y) by
hand firmly. Now start your smartphone camera app and
press your smartphone on the plate. Make sure that it is
properly secured. The camera should rest just above the
eyepiece. Place the smartphone exactly over the
eyepiece, so that the image is exactly centered on your
display. It may be necessary to use the zoom function to
Magnification with
2x Barlow lens
35X
117X