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12 Adjusting and focusing the eyepiece
extension
NOTICE
Do not move the focus wheel beyond the end point when the clamping screw is
tightened!
Eyepiece extension and gear parts may be damaged. Loosen the clamping screw before focusing.
When the end point is reached (slight resistance when turning), do not turn the eyepiece slide further
out.
1. Loosen or tighten the adjusting screw in order to make the optimum adjustment for the gear back-
lash in such a way that a smooth focusing without "slipping" of the eyepiece extension is ensured.
Do not overtighten the adjusting screw!
2. Tighten the clamping screw to fix the eyepiece extension (e.g. for photographic purposes).
3. Loosen the clamping screw to release the eyepiece extension and adjust the focus with the focus
wheel.
13 Cleaning and maintenance
NOTICE
Never take the objective out of its socket and do not modify its adjustment screws.
It is not possible to reinstall the objective in an accurate manner without specialist knowledge. A signi-
ficant reduction of the optical performance is the result. In this case the warranty claims become void!
NOTICE
Do not use aggressive cleaning agents!
Do not use photographic lens cleaners and no perfume-impregnated, dyed or lotion-soaked cloths to
clean optical surfaces. By the use the optics can take permanently damage!
• Protect the device from dust and moisture!
• Avoid fingerprints and similar contamination of the optical surfaces.
• The residual moisture must be completely degraded before use.
• Do not clean the optics too often! A little dust on the front of the lens or mirror surface will not signi-
ficantly reduce the image quality. This is no reason for cleaning.
• If necessary, carefully remove dust on the front of the lens or mirror surface with a camel hair
brush or blow away with compressed air.
