|
 |
|
|
|
|
|
 |
|
|
|
|
|
Instruction manual Wolterscope 150 f/11 (170 f/10 and 200 f/11)
This manual describes usage, cleaning and adjustment of the Multi - Schiefspiegler telescope. This telescope named as Wolterscope 150 f/11 (170 f/10, 200 f/11) has a free aperture of 150 mm (170/200 mm) and the f-ratio is 1:11 (or 1:10). Therefore the focal length amounts to:
150 mm x 11 = 1650 mm
(170 mm x 10 = 1700 mm)
The focuser with 2" tube diameter allows to connect accessoiries with 2" and 1.25 " tube size. The 1.25" adapter owns a T-thread and allows to adapt cameras by using a special T-Thread to camera adapter. The image (focal plane) is located about 85 mm behind the closest position ot the focuser. This distance defines the optical length of the focuser. A camera needs about 50 mm optical length to focus the image on the film plane. This means you have to rack in the focuser by this length to get a sharp image.
A binocular viewer needs an optical length of about 140 mm and therefore can not be used in combination with the focuser of the Wolterscope 150. For this special purpose it is necessary to replace the focuser by a smaller one. This can be done by amateurs, but you have to chose a focuser with adjustable base and have to take care that the optical axis is aligned with respect to the axis of the focuser. Optionally, we can deliver the telescope (150 f/11) with an short focuser which allows to use a binocular viewer.
For all the other accesoiries the optical length of the focuser is sufficient.
|
|
|
|
|
|
The telescope is ready to use, but it should be installed on a stable mounting for this purpose. Hints to adapt the telescope to different types of mounts are given below. We would like to emphasise to read this manual first to know more about the technical properties of your telescope.
First, you should control that all the parts have been delivered and nothing has been damaged. You should keep the invoice and the box safe. You will need them if you want to send the telescope back for repair or change. It is recommended that you always keep the telescope in the transportation case if its not in use. This will keep the telescope clean and protect it from damages.
Postal shipment of the telescope should also be done using the transportation box, wrap some damping material or strong paper around the box.
The following parts should have been delivered:
|
|
|
|
|
|
 |
Optical tube Wolterscope 150 (170/200) |
|
|
8 x 50 Finder with adjustable cell |
|
|
2" focuser with reduction to 1.25" |
|
|
transportation case |
|
|
instruction manual |
|
|
aperture mask, adjustment key |
|
|
|
|
|
|
For your first observations locate the telescope on a stable table or connect it to your mount.
Open the front cover and then attach a low power eyepiece to the focuser. You should look for distant objects (more than 20 m away). Do not try to look at the sun, the intense light will cause serious damages of your eyes.
Look through the eyepiece to see some objects in your envirement. Use the adjustment knob of the focuser to get a sharp image. You have to rack it out by several mm. The way of travel of this focuser is about 140 mm. All image directions will be reversed by the optics. This does not matter for astronomical observations. The same image orientation is realized by Newton and Cassegrain-Telescopes.
For observing terrestical objects you can use an Amici type prism which corrects the image orientation. For observing objects near the zenith a 90° prism or diagonal mirror is very convenient. The mirror reverses left and right side of the image.
|
|
|
|
|
|
We warn all people not to look into the sun with this telescope or with the finder.
The intense light will damage your eyes immediately, it can even destroy your eyes.
To prevent your eyes from damages, you should not use the telescope to look at the daylight sky. The focuser is tilted with respect to the light path and even if you think you had aligned the telescope to objects somewhere in the sky, it might occur that the sun will appear in the eyepiece. The tube edges are not parallel to the light path, therefore you always need the finder (which has to be adjusted) to locate the objects in your eyepiece.
|
|
|
|
|
|
Take care that other persons especially children do not look into the daylight sky with the telescope.
The sun can only be observed by using a special sunlight filter. You can get this solar filters from your local astronomical trader. They are made of a special foil or glass, covered by a coating which transmit less than 0.1% of light. The filter has to be attached in front of the telescope, covering its full aperture. Make sure that it covers the aperture entirely and that it is fixed and will not fall down during observations.
It is not sufficient and very dangerous to use only a small filter in front of your eyepiece. Due to the heat adsorption of the filter glass, it warms up and could be shattered. Your eyes are therefore not really protected by using this eyepiece filters.
Take also care to protect the finder from the sunlight by attaching a small solar filter in front of it.
|
|
|
|
|
|
|
|
|
