Troubleshooting - Bresser 70/900 NG Instrucciones De Uso

11. Dismantling the Telescope
Hopefully your observation session will have
been interesting and successful; afterwards,
it is recommended to store the telescope in
a dry and well-ventilated room. Please do not
forget to place the lens caps back onto the
front tube opening and the eyepiece holder.
All eyepieces and optical accessories should
also be stored in their respective containers.
TIP:
The inverting lens is not suitable for astrono-
mical observation. Here, work with just the
zenith mirror and an eyepiece. For terrestrial
observations and for viewing nature, you may
use the inverting lens with an eyepiece.
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Troubleshooting:

Problem
No image
Fuzzy image
Focusing is not possible
Bad image
Object of observation is visible in finder,
but not in telescope
Sluggish or stiff steering of the shafts
Image is "askew," even with zenith mirror
Solution
Remove lens cap from lens opening
Adjust focus with focus adjustment knob
Wait for temperatures inside tube to balance
out (about 30 minutes)
Never observe through a pane of glass.
Align finder (see chapter 7)
Balance telescope
The eyepiece holder in the zenith mirror
must be aligned vertically