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At what aperture do I use an ERF Energy Rejection Filter for solar imaging?

by Altair Support | Aug 18, 2020

ERFs are used for 2 main reasons. Improved image quality, by reducing heat buildup and hot air currents inside your telescope and by keeping your Hydrogen Alpha or Calcium filter at a stable constant temperature, it keeps it “on-band” – Etalons of...

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...

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