Technical Specifications - Velleman TELES1 Mode D'emploi

2. Now adjust the focusing tube (2) by turning the focusing knob (1) slowing back and forth until the blurred object
becomes precise.
3. If you are going to be looking through the telescope for a short period of time, you can insert the eyepiece directly
into the Focusing Tube. To be more comfortable when using your telescope for longer periods of time, place the
diagonal mirror (3) into the focusing tube and the eyepiece into the diagonal mirror.
b. Terrestrial viewing
Use the erecting eyepiece (13) to observe terrestrial objects, see "Putting in the erecting eyepiece" above. The
erecting eyepiece (13) can also be used as a 21X Microscope by placing the objective end right above an object and
looking through the eyepiece.
c. Aligning the finderscope
The relatively high magnifying power of the telescope results in a limited field of view. Therefore, finding a particular
star or planet could be a little hard.
To aid in correctly aiming your telescope, you have a finderscope: a small, low power telescope equipped with
crosshairs that provides an incomparably wider field of view than the main telescope. When the finderscope is
correctly aligned, locating a celestial body via the main telescope becomes less difficult.
We strongly recommend that you follow these directions during daylight hours.
1. Install the 20 mm eyepiece into the diagonal mirror. Pick an easily recognizable, stationary object at about 1 km.
Centre the object in the field of view and focus. Tighten the azimuth lock (11) to hold the telescope in position.
2. Look through the finderscope. If you cannot see the selected object, loosen the adjustment screws and move the
finderscope around until you see it. Tighten the adjustment screws while keeping the object in sight.
3. Use the adjustment screws to move the object squarely onto the crosshairs.
4. Recheck telescope to make sure that it is still on focus.
5. If it has moved, then readjust your telescope and repeat the alignment step for the finderscope.
d. Selecting a Lens
Power means the ability of the telescope to increase an image, or appear to bring the image closer to the viewer. The
value of magnifying power is expressed by a number followed by an X (read power). Therefore, if you view an object
at 70X, you are seeing it as though you are 70 times closer to that object.
Power is calculated by dividing the focal length of objective lens of your telescope by the focal length of the eye lens
you choose. The focal length of the eye lens is usually indicated on the eyepiece itself. For example: 10mm
Example: 700 mm (focal length of objective lens) = 70 X (power)
10 mm (focal length of eyepiece)
A longer focal length of the eyepiece reduces the magnifying power of the telescope. A shorter focal length enhances
the power.

7. Technical Specifications

Objective Diameter
Focal Length
Eyepieces
Maximum Magnification
Accessories
The information in this manual is subject to change without prior notice.
TELES1
50 mm (1.97")
700 mm
20 mm (35X), 10 mm (70X), 4mm (175X)
175X
Diagonal mirror, 5 X 25mm Finderscope, erecting eyepiece / 21X Microscope
3 VELLEMAN