Manual Bresser 9140400 National Geographic 40-400 (page 9 of 36) (English, German, Dutch, French, Italian, Polish, Spanish)

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The magnication also depends on the focal width of the telescope tube. This telescope contains a tube

with a focal width of 400 mm.

Examples:

400 mm / 20 mm = 20X magnication

400 mm / 12.5 mm = 32X magnication

Focus wheel

Look through the telescope eyepiece (3) and hone in on a far away object that you can see well (for in-

stance, a church tower). Focus in on the object with the focus knob (1) in the way shown in Fig. 3.

Smartphone holder







Insert the eyepiece (3) into the smartphone

holder (11) and tighten the screw (X) to the

bracket rmly. Then set the smartphone holder

with the eyepiece into the eyepiece connection

(2) and tighten the clamping screws (Y) by

hand rmly. 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 ll 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.

Technical data:

• Design: achromatic

• Focal length: 400 mm

• Objective diameter: 40 mm

Notes on cleaning

• Clean the eyepieces and lenses only with a soft, lint-free cloth, like a microbre cloth. To avoid scratching

the lenses, use only gentle pressure with the cleaning cloth.

• 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 ac-

climatise for a short period of time, so that the residual moisture can dissipate before storing.

Possible observation targets

The following section details several interesting and easy-to-find celestial objects you may want to

observe through your telescope.

The Moon

The moon is Earth's only natural satellite.

Diameter: 3,476 km / Distance: 384,400 km from Earth (average)

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Bresser 9140400 National Geographic 40-400 Manual

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