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C5 dirty optics

Started by chasgood, 01/20/2008 09:55AM
Posted 01/20/2008 09:55AM Opening Post
Hi. I'm new to Astromart.
About 10 years ago I bought a used C5 spotting scope. Got a Skyview deluxe EQ mount for it. I have used it off and on over the years, my interest was never to strong. Now I have a DSLR camera and started taking pictures of the moon. In general using it more.
Dirt or dust spots show up on the photo's. I can look in thru the corrector plate and see some dust and dirt on the inside of the plate and on the mirror. Can't really see the secondary to well to tell if it is dirty but I imagine it is like the rest. Not real bad but more than just a few specks.
So what is the best way to get the little scope cleaned? I'm affraid to take it apart myself. Does Celestron do this sort of work? How about third party service? Can the scope be tuned up while they have it apart?

Thanks
Charlie
Posted 01/20/2008 12:05PM | Edited 01/20/2008 12:06PM #1
You might post a photo here showing the spots. But I
am 99% sure that the spots you see are inside your camera
on the DSLR filter or sensor. As a quick test you might
put a normal lens on the camera, manually set the lens
to F/11 or slower, and get a couple shots of the sky or
a blank wall.

The dust you see on the C5 glass is completely out of focus,
so it cannot make spots in the images. It will just make
the image maybe 0.1% dimmer.

Celestron does do that sort of work. I sometimes see
reports of new-looking scopes coming back from Celestron
service.

I once tried to take a C5 apart for cleaning, but
I could not get the front corrector off. It was
glued or stuck on somehow. Probably best to let
Celestron do it.
Posted 01/20/2008 03:55PM #2
Charles Goodenow said:

Hi. I'm new to Astromart.
About 10 years ago I bought a used C5 spotting scope. Got a Skyview deluxe EQ mount for it. I have used it off and on over the years, my interest was never to strong. Now I have a DSLR camera and started taking pictures of the moon. In general using it more.
Dirt or dust spots show up on the photo's. I can look in thru the corrector plate and see some dust and dirt on the inside of the plate and on the mirror. Can't really see the secondary to well to tell if it is dirty but I imagine it is like the rest. Not real bad but more than just a few specks.Thanks
Charlie

Your telescope does not need to be taken apart. These dust spots are on your camera's chip. Leave poor Mr. Scope alone and enjoy him.

8)

Uncle Rod

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