Practical dust-cover for all types of telescopes. Prevents dust and moisture from entering the optical tube and reaching the primary and secondary mirrors. Can also be used to cover the primary mirror.
Available in 3 sizes:
# 30A115 - for telescopes 150 to 250 mm in diameter
# 30A116 - for telescopes 270 to 360 mm in diameter
# 30A117 - for telescopes 370 to 520 mm in diameter