Re: Help! Streaks Form Cleaning my Mirror



rsiegel@xxxxxxxxxxxxxxxxxxxx wrote:
> I cleaned my 8" dob mirror for the first time in 7 years as per the
> instructions in the Celestron manual. I used a camel hair brush
> working from the center otward applying no pressure to remove the
> dust. Then I used white uncented kleenex with a 60/40 solution
> isopropyl alcohol / distilled water. I applied the solution to the
> kleenex, and applied no pressure. I worked from the center outward.
>
> It seems to me that the streaks are mostly from the brush. I cant tell
> if the streaks are where the grime is coming of (and maybe I should
> apply a little pressure), or if it's the mirror coatings coming off.
> The mirror is/was pretty grimy to begin with.
>
> Here is a picture. Note in particular the "clean" area at the
> one-o-clock position:
> http://www.epcinternet.com/Mirror.jpg
>
> What should I do?
I think most of the views and suggestions are much too pessimestic.
My thoughts are that the discoloration is due to extraction of oil
from your hands or other similar products from the Kleenex and are of
the order of 1 molecule thick. "The oil on water with a drop of soap
effect." Furthermore since the view is a glancing one there may not be
any serious problems when images are viewed as they are in the scope.
For example, can you see the dicoloration when viewed perpendicularly.
>
> Many thanks in advance.
>
> ** If you want to send me e-mail, remove the NOSPAM from my address **

.

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