what are black spots on the mirror of my telescope?
i have bought it just 1 month ago they were just 2 spots but now they are going more.what are they?
Asked By: celestialviews(champion) - 1/2/2009
Best Answer - Chosen by Asker
Depends. If you have an open bottom on your OTA (optical telescope assembly, which is the tube, mirrors, mirror mounts, finder and eyepiece holder) shine a light through the back end of the mirror. But don't disassemble the OTA to get to the mirror unless you know what you're doing. You can throw the optics out of... More
Answered By: Scotty - 1/2/2009
Additional Answers (3)
I've had many reflectors over a 50-year period, but I've never seen black spots on any of my mirrors. Ordinary dust, yes, but it sounds from your description like these are in the coating. Do you live close to salt water? These might be spots of corrosion from droplets of salt water. I'd return it to the store where... More
Answered By: Geoff G - 1/2/2009
Probably just carp(sp) form the atmosphere. You can have an awful lot on a mirror before cleaning is necessary. Don't obsess about them, just minimize the formation by capping the tube and putting something in the eyepiece holder (traditionally a 35mm film canister) at the end of each observing session.
Answered By: Blackshuck - 1/2/2009
Sorry, but I don't think anyone will be able to answer your question without a few more details, like... More
Answered By: Larry454 - 1/2/2009
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