CYZW D76F300mm Astronomical Telescope Accessories Spherical Concave Mirror Lens (Primary Mirror + Secondary Mirror Set)

Description

• For DIY Telescope Spherical Concave Mirror D76F300mm Optical Spherical Glass
• The main mirror is made of K9 glass with a diameter of 78mm and a focal length of about 300m
• The minor axis of the secondary mirror is 20mm, and the surface is coated with aluminum film and aluminum oxide protective film
• The aperture and joube are both small, so they are suitable for buying back to practice hands or use as children's telescopes. According to the feedback of friends who have done so, dozens of craters can be photographed.
• 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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