2 replies to this topic

[RickScofield]

I have a question regarding cleaning the flip mirror under the eyepiece on a ETX 90. Looking at the mirror I can see smuging on the glass making it cloudy. What can I use to clean it?

[Mark Sibole]

for all optics including eyepieces filters and corrector plates.

 

 

Use a clean bowl or measuring cup
Strain 1 cup 98% Isopropal Alchol through the coffee filter into A clean container.
Strain 3 cups Distilled water through a new coffee filter  into the same container.
Add 1 table spoon of windex( only the blue windex free of amonia.)
The windex isnt a must but helps in the end process to help prevent streaking.
Stir this mix untill mixed very good.
Strain this Mixture through a clean coffee filter into the Clean Spray bottle.
This solution can be used to clean eyepieces,Corrector Plates , filters as well as the CCD chip.

[RickScofield]

Thank you Mark, I'll make some of this and see how it works. What should I use for wiping material, plain Kleenex?