Bahtinov Mask Size::85-120mm Both primary and secondary mirrors

Both primary and secondary mirrors are finished with Sky-Watcher’s RAQ™ Radiant Aluminium Quartz coatings

Coating (rear face) 7-layer hard-multicoating

Storage Temperature: -20°C—60°C

the high transmission

NexStar GT  (with Aux Splitter)

Bahtinov Mask Size::85-120mm Both primary and secondary mirrorsBahtinov Mask Whether youre doing planetary visual observing, planetary imaging, or deep sky imaging, the Bahtinov Mask is a great accessory to get the best focus for your telescope quickly and easily. Credit goes to Russian amateur astronomer Pavel Bahtinov for making his idea available to the astronomy community. Bahtinov masks are adjustable to fit a wide range of optical tubes, unlike masks which are only able to fit one telescope. They have an