this morning I was ready for the shooting of the great sunspot, but unfortunately the cloudy sky didn't help me ...
So I decided to try cleaning the blue filter of my BF 1200 of the Lunt 60mm telescope.
I have owned it for eight years now, and for over a year it had begun to degrade.
It started with a small spot on the surface, which got bigger over time.
Then lately other blurred areas have appeared, so much so that I began to suspect a degradation of the image of the Sun.
So I got myself a wrench to disassemble the sealing ring, which very easily unscrewed.
It can be said that it was just pulled, and the glue used to block it no longer held.
I then used a product for cleaning and polishing the plastic parabolas of automotive headlights, a product similar to others which, however, are not easily found in Italy.
With a cotton cloth I passed the polishing cream several times, and rubbed with light pressure.
At the end of the operation the filter appears shiny, even if observing it with the right angle of light one can still see a residue of the opacity.
But anyway now I have a more transparent filter than before, I just wait for the Sun to test it.
I still have a spare blue filter, sent to me free by Lunt, but I wanted to try the home polish to see the result.