My dewshield slips down when scope is pointed upwards, how do I fix it?
by Altair Support | Aug 10, 2020
Gently tighten the grub screws embedded in the ring / bezel around the base of the dew-shield with an Allen key until it stops slipping. Don’t over tighten them or you risk damaging the optical tube!How do I clean dust off the inner surface of my refractor lens?
by Altair Support | Aug 10, 2020
Firstly, please be aware that even a large about of dust will not affect image quality, because it’s at the pupil of the optical system and cannot be in focus. The “piston” effect of the focuser drawtube moving back and forth does inevitably draw outside air into the...Camera Filter
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