Dirty corrector plate / fungus-like "stains"
Posted 26 September 2023 - 06:50 PM
I have been having trouble using barlows since lots of specks appeared in my images… I then realised that it was because of my dirty corrector plate :/
Is everything okay with this part? Can I just clean it? If so, how do it proceed with the cleaning?
Photos of the corrector plate: https://imgur.com/a/jJ83JpD
Posted 26 September 2023 - 07:42 PM
Yes. Try a drop of dish soap in 6-8 oz of distilled water. If it doesn't come off easy with that, some 98% denatured alcohol should do it. Hopefully the stuff hasn't eaten into the coatings.
Posted 26 September 2023 - 08:10 PM
Search the forums for corrector plate cleaning, as well as fungus cleaning. The process is not really all the difficult. However, if you don't know what you are dong, you will likely really mess up your telescope.
The key thing is that when corrector plates need to be removed they should be "marked" so that they can be put back on the scope in the exact orientation (i.e. rotation position) that the factory installed them.
There are also some good how to YouTube videos on this topic. I particularly like this on about disassembly and cleaning of the Celestron 6/8 SCT. https://www.youtube....h?v=0Pi6VcH38pc ..
Posted 26 September 2023 - 08:50 PM
Do you have an example that shows the specks that ‘appear in your images’? If they look reasonably in focus, the problem is much closer to the sensor. Bits of whatever on the corrector are probably not going to be visible in your images.
- speedster likes this