Pointing Your Telescope; Technical Data - National Geographic BRESSER 76/350 Mode D'emploi

Your telescope consists of these parts:
1. Focus wheel
2. Telescope (Telescope tube)
3. Compass
4. Alt-azimuth mount
5. Azimuth scale
6. Scale with 90° steps
7. Height adjustment wheel
Additional equipment:
8. Two Eyepieces (6 mm, 20 mm)
9. Barlow lens 2x
10. Moon filter
11. Software
Please look for a suitable location to set up your telescope before you begin. Use a
stable surface like a table or countertop.

Pointing your telescope

Azimuthal mounting means that you can move your telescope up and down, left and
right.
With the height adjustment wheel (7) and the turnable azimuth mount, you can point
the telescope at any object you want. Use the wheel (7) to tilt the telescope up and
down. By using the azimuth mount like a turntable you can pan the telescope to the
left and to the right.
Which eyepiece is right?
It is important that you always choose an eyepiece with the highest focal width for the
beginning of your observation. Afterwards, you can gradually move to eyepieces with
smaller focal widths. The focal width is indicated in millimeters, and it is written on
each eyepiece. In general, the larger the focal width of an eyepiece, the smaller the
magnification. There is a simple formula for calculating the magnification:
8
Focal width of the telescope tube / Focal width of the eyepiece
= Magnification
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 magnification:
350 mm / 20 mm = 18x magnification
The table below shows some common magnifications.
Telescope tube Focal width of
focal width eyepiece
350 mm 20 mm
350 mm 6 mm
Kompakt-Teleskop
Compact Telescope
Art. No. 90-15000
f=350 mm / d=76 mm

Technical data:

Focal width/Mirror Diameter
Article number
Design: Dobson
Magnification Magnification with
2x Barlow lens
18x 35x
58x 117x