While collimating my Newtonian mirrors, I noticed some strange stains on my coma corrector. It looks like dried up water droplets (I once got hit by a little rain) but I can’t say for sure. What a shame. I’ve only had this coma corrector a couple of months and it cost me $589, so I’d like to have it looking a little cleaner. Flats seem to eliminate any artefacts as I’ve never noticed this until today.
Any advice on whether I should clean it or just leave it? If I clean it, I’m a little worried about damaging and smearing the anti reflection coating.
Hmm….
Might be some condensation
If you bought it from Sidereal, give Diego or Bill a call or email for advice
It’s a quality product with warranty so it should be replaced if defective
If it’s just on the external surface of the lense, some lense cleaning solution with a clean microfibre cloth or cotton swab should fix this no probs. Give it a good blow with a bulb puffer first. If it’s worked it’s way into a multi lense cell then that might need a pro service.
Thanks Dave & Martin. I’m not entirely sure if rain got between the lenses, but thankfully it doesn’t look like it. I was privately advised to purchase an ROR spray, spray onto a cotton bud, and smear ever so gently over the lens, most of the pressure coming from the weight of the cotton bud.
I might give that a go, unless someone thinks that’s a terrible idea? Feel free to share your comments.
Stephane,
Ive been observing using my 12” Goto dob and high end Televue eye piece collection for about 5 years now
I’ve never used any cleaning fluids , spray ,isopropyl alcohol , lens pens or similar on my TV eye pieces and Powermates
I buy quality microfibre cloths from my Optometrist
Just a few quick blasts with my hurricane blower and a light wipe and their clean, no chance of any fluid chemicals affecting the coatings or leak behind the lens seals.
I only use the MF cloth once on either side and then bin it
