How dirty is too dirty? What I'm really asking when does the view become effected? (Primary mirror of a reflector in my case.) What are the first visible signs during observing? Any thoughts would be appreciated.
When is the mirror in need of a bath?
Started by SteveF, 12/05/2002 02:02AM
Posted 12/05/2002 02:02AM
Opening Post
Posted 12/05/2002 12:49PM
#1
Not easily answered because typically the dirt/dust accumulates over time and you don't notice it. I really don't understand why people are so hesitant to want to clean their mirrors. I have found that with reasonable care a mirror can be removed and cleaned and returned back to use in 10 minutes or less.
Anyway, I seriously doubt one would be able to tell much difference in brightness or sharpness between a moderately dirty mirror and one perfectly clean. IMHO
Walt
Anyway, I seriously doubt one would be able to tell much difference in brightness or sharpness between a moderately dirty mirror and one perfectly clean. IMHO
Walt
Posted 12/05/2002 02:07PM
#2
Cleaning mirrors is when they tend to get scratched, though it is not a hard job. One should neither be terrified of the task, nor compulsive about it. It also takes a fair amount of dust to become noticeable in the image, especially as it happens gradually over time. I believe that the first effect is typically a loss in contrast and a lowering of the strehl ration.
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