CYZW D135F1100mm Telescope Spherical Concave Mirror Lens Set for DIY Telescope Builders

Description

• For Telescope Spherical Concave Mirror D135F1100mm Optical Spherical Glass
• The main mirror material is K9 glass, spherical reflecting concave mirror,
• 135mm diameter, 1100mm focal length,
• The focal ratio (the ratio of focal length to aperture) is 8.14, and the surface is coated with aluminum film and oxide film.
• Pack include:Primary Mirror + Secondary Mirror Set

Used:Cleaning the mirror surface: first blow off the dust that can be blown off with a blown balloon
then use a good quality absorbent cotton to dip the alcohol and gently wipe the mirror.
After drying, look at the light source from the side to see if there is some cotton or Keep the water stains on top, and if necessary, gently wipe them with some good quality mirror cloth (be careful, otherwise it will affect your telescope)

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