ZWO UV/IR Blocking Filter - 1.25" tilt adjuster The periodic error of the

The periodic error of the mount is measured in the factory (total of 12 points per 30 degrees worm gear) and corrected before delivery

Glass surfaces such as telescope lenses pointing to the clear sky are prone to having dew forming on the lens during the night - especially if its humid

Focal Length: 1800mm (1278mm with Reducer)

Separate cable connections between your accessories and your computer are also no longer necessary

Weight (kg): 0

ZWO UV/IR Blocking Filter - 1.25" tilt adjuster The periodic error of theThis filter blocks out ultraviolet and infrared light which improves the imaging and viewing on many telescopes. This is especially useful for camera sensor chips that have no UV protective AR glass and are sensitive to UV and IR light. The filter is used for luminance imaging and for Moon and Planet images. Infrared or IR light is invisible to the human eye, and so even though most telescopes are not designed to focus IR light, it does not matter