Pointing Your Telescope; Technical Data - Bresser National Geographic 90-65000 Instrucciones De Uso

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
8. LED Viewfinder
Additional equipment:
9. Two eyepieces (6 mm, 20 mm)
10. Barlow lens 2x
11. Moon filter
12. 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.
Fine adjustment is done with the aid of the LED Viewfinder (8). Look through the view-
finder and try to align it with the North Star in the centre of the crosshairs (No. 1).
Which eyepiece is right?
It is important that you always choose an eyepiece with the highest focal width for the
beginning of your observation. Afterward, you can gradually move to eyepieces with
smaller focal widths. The focal width is indicated in millimeters, and it is written on
8
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:
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 500 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:
500 mm / 20 mm = 25x magnification
The table below shows some common magnifications.
Telescope tube Focal width of
focal width eyepiece
500 mm 20 mm
500 mm 6 mm
Kompakt-Teleskop
Compact Telescope
Art. No. 90-65000
f=500 mm / d=114 mm

Technical data:

Focal width/Mirror Diameter
Article number
Design: Dobson
Magnification Magnification with
2x Barlow lens
25x 50x
83x 167x