72mm Evostar fogged inside surface of Objective
- John Donne
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72mm Evostar fogged inside surface of Objective
The last time I had it out it was quite cold and got colder as the evening progressed...eventually just at frosting temp for the first time this season. I noticed my Objective fogged. When I looked with a flash light I discovered it had fogged on the inside surface of the Obj Cell.
I took it inside and removed the diagonal so the inside was open and after about 20 minutes the fog had cleared.
It looks fine now.
I have never had any of my larger fracs do that.
Anyone else have this experience?
Fog was not between the elements but on the back side of the cell.
Thank you
MOUNTS: SW AZ/EQ5, MEADE LXD75, CELESTRON CG4, Farpoint Parallelogram.
BINOCULARS: CL 10X30, Pentax 8X43, 25X100 Oberwerks.
EP: Many.
"I am more than a sum of molecules.
I am more than a sum of memories or events.
I do not one day suddenly cease to be.
I am, before memory.
I am, before event.
I am"
- pakarinen
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Re: 72mm Evostar fogged inside surface of Objective
Man... That's some icky-tasting stuff!
=============================================================================
AT50, AT72EDII, ST80, ST102; Scopetech Zero, AZ-GTi, AZ Pronto; Innorel RT90C, Oberwerk 5000; Orion Giantview 15x70s, Vortex 8x42s, Navy surplus 7x50s, Nikon 10x50s
- John Donne
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Re: 72mm Evostar fogged inside surface of Objective
I have stored it it with the plug cover in the focuser..
It must be that there was enough humidity in warmer temps from the use before that when I closed it up it trapoed that bit in there. When it got cold enough that little bit condensed on that cell. I will put a warmer on it the next time.
MOUNTS: SW AZ/EQ5, MEADE LXD75, CELESTRON CG4, Farpoint Parallelogram.
BINOCULARS: CL 10X30, Pentax 8X43, 25X100 Oberwerks.
EP: Many.
"I am more than a sum of molecules.
I am more than a sum of memories or events.
I do not one day suddenly cease to be.
I am, before memory.
I am, before event.
I am"
- Bigzmey Online
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Re: 72mm Evostar fogged inside surface of Objective
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Delos, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
Diagonals: Baader: BBHS mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: 2" prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC.
Solar: HA: Lunt 50mm single stack, W/L: Meade Herschel wedge.
Observing: DSOs: 3122 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2196, S110: 77). Doubles: 2461, Comets: 34, Asteroids: 261
- Thefatkitty
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Re: 72mm Evostar fogged inside surface of Objective
It should be fine. Yup, remove the diagonal; I've never had a problem that I could see with my scopes. I remember on Jan 21, 2019 I was out observing the lunar eclipse with my 80mm
Almost three years later, much of the same since, never a problem
Hope you have a clear night!
All the best buddy,
"The Hankmeister" Celestron 8SE, orange tube Vixen made C80, CG4, AZ-EQ5 and SolarQuest mounts.
Too much Towa glass/mirrors.
Solar:
H/A - PST stage 2 mod with a Baader 90mm ERF on a Celestron XLT 102 (thanks Mike!)
Ca-K - W/O 61mm, Antares 1.6 barlow, Baader 3.8 OD and Ca-K filters with a ZWO ASI174mm.
W/L - C80-HD with Baader 5.0 & 3.8 Solar film, Solar Continuum 7.5nm and UV/IR filters with a Canon EOS 550D.
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- AstroBee Online
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Re: 72mm Evostar fogged inside surface of Objective
Scopes: Celestron EdgeHD14", Explore Scientific ED152CF & ED127 APO's, StellarVue SV70T, Classic Orange-Tube C-8, Lunt 80mm Ha double-stack solar scope.
Mounts: Astro-Physics Mach One, iOptron CEM70EC Mount, iOptron ZEQ25 Mount.
Cameras: ZWO ASI2600mm Pro, ZWO 2600MC Pro, ZWO ASI1600mm
Filters: 36mm Chroma LRGB & 3nm Ha, OIII, SII, L-Pro, L-eXtreme
Eyepieces: 27mm TeleVue Panoptic, 4mm TeleVue Radian, Explore Scientific 82° 30mm, 6.7mm , Baader 13mm Hyperion, Explore Scientific 70° 10mm, 15mm, 20mm, Meade 8.8mm UWA
Software: N.I.N.A., SharpCapPro, PixInsight, PhotoShop CC, Phd2, Stellarium
https://www.nevadadesertskies.com
- John Donne
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Re: 72mm Evostar fogged inside surface of Objective
The scope seems quite fine now. Just one of those things I had not experienced before.
Thank you again and clear skies to you all.
MOUNTS: SW AZ/EQ5, MEADE LXD75, CELESTRON CG4, Farpoint Parallelogram.
BINOCULARS: CL 10X30, Pentax 8X43, 25X100 Oberwerks.
EP: Many.
"I am more than a sum of molecules.
I am more than a sum of memories or events.
I do not one day suddenly cease to be.
I am, before memory.
I am, before event.
I am"
- Altocumulus
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Re: 72mm Evostar fogged inside surface of Objective
I do what I do because I can, and because I want to.
It doesn't mean I know what I'm doing
- John Donne
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Re: 72mm Evostar fogged inside surface of Objective
Thank you Altocumulus.Altocumulus wrote: ↑Sat Nov 13, 2021 10:49 am A sachet or two of desiccant might help, left snug inside the draw tube after the eyepiece/camera removed / in or out a suitable container?
Yes.
This is a good plan.
Thank you.
MOUNTS: SW AZ/EQ5, MEADE LXD75, CELESTRON CG4, Farpoint Parallelogram.
BINOCULARS: CL 10X30, Pentax 8X43, 25X100 Oberwerks.
EP: Many.
"I am more than a sum of molecules.
I am more than a sum of memories or events.
I do not one day suddenly cease to be.
I am, before memory.
I am, before event.
I am"
- mikemarotta
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Re: 72mm Evostar fogged inside surface of Objective
It is usually warm here, certainly by midwest USA standards, but I do watch the dew-point in the weather forecasts and even so, my backyard seems to get condensation sooner than predicted. So, I have taken to drying everything out when I bring them in. I open the telescope by removing the diagonal. I set the oculars aside, longwise. I also have lots of those little gel packs you get in pharmacy bottles and put them everywhere, like inside the box for my Nagler, I have two.John Donne wrote: ↑Wed Nov 10, 2021 2:28 pm...eventually just at frosting temp for the first time this season. I noticed my Objective fogged. ... I took it inside and removed the diagonal so the inside was open and after about 20 minutes the fog had cleared.
Michael E. Marotta
Astro-Tech 115 mm APO Refractor Explore Scientific 102 mm f/6.47 Refractor Explore Scientific 102 mm f/9.8 Refractor Bresser 8-inch Newtonian Reflector Plössls from 40 to 6 mm Nagler Series-1 7mm. nonMeade 14 mm. Mounts: Celestron AVX, Explore Twilight I Alt-Az, Explore EXOS German Equatorial
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