Cliff Mygatt Astronomical League Master Observer
Astronomical League Lunar II & Constellation Hunter programs national coordinator President, Olympic Astronomical Society Bremerton, WA
Orion XT12i Fully flocked with Zambuto Mirror, Protostar quartz secondary and Moonlite CR focuser
Meade 8" LX10 SCT Fully Flocked with Magellan I DSCs
Orion 120mm and William Optics 80mm Refractors Ethos 21mm,17mm,13mm,10mm,8mm,6mm,4.7mm,3.7mm Nagler 31mm and paracorr type 1
Quote:Thanks for the replies. Cames, that is good information and has me leaning to using a soapy water mixture of Dawn or Dreft instead of the acetone or alcohol.
Quote:Jeff,Acetone will dissolve the adhesive holding the center spot in place. Acetone may not entirely remove the spot if the contact time is short but you will almost instantly have a mixture of acetone and adhesive pooling on the coated mirror surface. The problem is that the acetone evaporates extremely quickly and when it does, it will have redeposited the adhesive on the coating where you don't want it to be. If you are going to use acetone, be sure to have some soapy water ready to dilute and rinse away the acetone/adhesive mixture before any of the acetone evaporates. Once you have thoroughly washed away the 'adhesitone', complete the rinse and dry phases normally. This should prevent the adhesive haze that would otherwise appear. Good luck.Presoak the cotton to soften it. Contacting the coating with dry or incompletely wetted cotton has a high probability of sleeking the coating.Never use Q-tips and the like. In my experience, they scratch coatings like sandpaper.--------C
StarStructure 24" f/3.3 | ServoCAT/Argo Navis
Astro-Physics 175EDF | AP1100GTO | ATS Portable Pier
Psalm 19.1 - A Psalm of David. "The heavens declare the glory of God, and the sky above proclaims his handiwork".
Rob 18" f/4.3 Starmaster 8" Meade LX200 Classic Celestron 15x70 Skymaster Binoculars
Quote:Trouble is, my 18" mirror is too big for my sink. I've looked for something along the lines of a large drip pan, but haven't yet seen anything suitable.
Indiana for two more weeks...
14.5" Teeter w/ Richard Fagin mirror, TT #66
EON 120ED on CG-5 ASGT
Lunt LS60THa/B1200 Sky Guy Porta II
Denk Super System with A45 OCS
Quote:Great info on this thread. Didn't know about acetone and cotton not playing well together. I like to keep my mirror clean, but have found that after following the procedure in the Starmaster manual (which basically involves spray bottles, dish soap, distilled water and avoids touching the mirror), I can still see a faint haze.I doubt that the slight haze on my mirror really makes a significant difference for most objects but it sure can't help things, and for challenge objects I need all the help I can get. At the same time I don't want to risk scratching the mirror or fuss with acetone residue so I've been giving some thought to using my fingertips too. Trouble is, my 18" mirror is too big for my sink. I've looked for something along the lines of a large drip pan, but haven't yet seen anything suitable.
Quote:Thanks for the links, Don P. I have seen the handwashing video before and will be doing it later this week. I was not thrilled about dragging a large cotton toboggan over my primary. Don, do you totally submerge your mirror or do it like the video shows? Turtle86, the red light while collimating is the same way I noticed my film/haze. After two attempts with cotton balls I got a "spoked wheel" effect with most of the haze still there.
"I have been paddling in the shallows of a great ocean of knowledge." - Sir Isaac Newton * * 15" F4.55 Starsplitter Dob & a Denk II binoviewer * * http://peaceofsky.wordpress.com/ Pacheco State Park Fremont Peak
Quote: The mirror runs a bigger danger from chipping by hitting it against the sink, so there you do have to be careful...
Z10 dob, flocked
"When I consider your heavens, the work of your fingers, the moon and the stars, which you have set in place, what is man that you are mindful of him, the son of man that you care for him?" --Psalm 8:3-4
Quote: It's cheaper than dirt.
Quote:Any thoughts from any of you about whether the type of tap water in the home (hard vs. soft) has any impact on the mirror?
Home made 16" f5 Terry Ostahowski optics - ArgoNavis/ServoCAT
ES 30 mm, Ethos 21, 13 and 10 mm, Paracorr II, Antares Barlow 2" 1.6X
2" DGM NPB filter
2" Catseye Cheshire/Sight tube - 2" Howie Glatter laser + Tublug
Celestron C11+EQ6, skywatcher /Zambuto 12"dob,watchhouse tracking platform, 16"/Zambuto lightbridge , Ethos's 6,8,10,13,17,21. Naglers 31,26. Lieca ash zoom, televue 2.5 powermate,2"2x powermate .Paracorr type2. Howie glatter 2" laser & Tublug. Lumicon 2" UHC, 03, H-Beta,Televue smoothies ( all of em) , Meade 4000 smoothies ( all of em). That'll do for now.
Quote:If the haze is difficult to remove, i wonder, if an alkaline based cleaner would work?I haven't cleaned my mirror yet, so this is just theory for me.I know, most dish soaps are alcohol based. So, they clean certain stuff, but not all. The water, for instance, helps get sugars off, since alcohol does not dissolve that. So, when cleaning furniture, I use alcohol, then water, then alcohol again.So, try some alcohol, if that doesn't work, try an alkaline based cleaner. Spic and Span is such, and "Awesome Cleaner", sold here in the states.Any yellow cleaner, that is very slippery, is alkaline based. Dissolves different things than alcohols.Anyone tried alkaline on their mirrors? I know that alkaline does wonders for stained dishes and mugs. Let it soak, stains gone!Another bit of cleaner info: all cleaners work one molecular layer at a time. So, it may take awhile, repeated applications, to get it all off.