Whuh??

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pakarinen United States of America
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Whuh??

#1

Post by pakarinen »


Was taking some pics of my 90 Mak in case I decided to sell it and noticed spots on the corrector. I don't know when that happened or what it is. I've never seen fungus and this looks like maybe something attacked the coating chemically.

Experts?

Thanks!
IMG-0967.jpg
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I drink tea, I read books, I look at stars when I'm not cursing clouds. It's what I do.
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AT50, AT72EDII, ST80, ST102; Scopetech Zero, AZ-GTi, AZ Pronto; Innorel RT90C, Oberwerk 5000; Orion Giantview 15x70s, Vortex 8x42s, Navy surplus 7x50s, Nikon 10x50s
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Lady Fraktor Slovakia
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Re: Whuh??

#2

Post by Lady Fraktor »


A bit hard to tell from the size of the image but it is a possibility.
Could they be water spots on the inside of the corrector?
With close inspection can you tell if it is on the inside or outside?
If the outside it should not be fungus.
See Far Sticks: Antares Elita 103/1575, AOM FLT 105/1000, Bresser BV 127/1200, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS100/1000, Vixen SD115s/885
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Az/Alt: AYO Digi II/ Argo Navis, Stellarvue M2C/ Argo Navis
Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102
Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Takahashi prism, TAL, Vixen flip mirror
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Re: Whuh??

#3

Post by John Baars »


If it is on the inside, there should be no problem cleaning it.
Mark the position of the corrector like in the picture.
IMG_1629 (326x640).jpg
Unscrew the corrector.
IMG_1637 (640x480) (2).jpg
Clean it with a mild soap and a scratchfree wet cloth. Don't go scrubbing.
Keep the cover on, because it is black you'll see every contamination.
Rinse with a wet cloth.
Dry with a scratchfree cloth.
Blow it dust-free
Screw the corrector back on and reposition according to the markers.
Ready! No collimation needed.

Try to work in a dust free environment. Because the background is black, you'll see every little spec of dust. Not that it matters for the image, but selling is another story.
Refractors in frequency of use : *SW Evostar 120ED F/7.5 (all round ), * Vixen 102ED F/9 (vintage), both on Vixen GPDX.
GrabnGo on Alt/AZ : *SW Startravel 102 F/5 refractor( widefield, Sun, push-to), *OMC140 Maksutov F/14.3 ( planets).
Most used Eyepieces: *Panoptic 24, *Morpheus 14, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
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Re: Whuh??

#4

Post by pakarinen »


They're on the front - maybe dew? I've never felt the need to use a dew heater, but maybe I should.

Is dishwashing soap too strong? I remember years ago that people were using distilled water and alcohol, but I think that was for primary mirrors.
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I drink tea, I read books, I look at stars when I'm not cursing clouds. It's what I do.
=============================================================================
AT50, AT72EDII, ST80, ST102; Scopetech Zero, AZ-GTi, AZ Pronto; Innorel RT90C, Oberwerk 5000; Orion Giantview 15x70s, Vortex 8x42s, Navy surplus 7x50s, Nikon 10x50s
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Re: Whuh??

#5

Post by Star Dad »


I've used ORIGINAL Windex and ORIGINAL Bounty wipes as someone recommended to me. They do a great job and dries quickly. I have a Newt, and have learned that some Windex gets in behind the mirror on it's mount. So I make sure I wait a couple of hours to remount the mirror so I don't get streaks of droplets. You can also use Acetone if conditions are bad enough and then hit it with the Windex.
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Re: Whuh??

#6

Post by Lady Fraktor »


I use Zeiss wipes, for small jobs like this.
https://www.walmart.com/ip/ZEISS-Lens-W ... /698742370
See Far Sticks: Antares Elita 103/1575, AOM FLT 105/1000, Bresser BV 127/1200, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, AXJ, AXD
Az/Alt: AYO Digi II/ Argo Navis, Stellarvue M2C/ Argo Navis
Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102
Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Takahashi prism, TAL, Vixen flip mirror
Eyepieces: Antares to Zeiss
The only culture I have is from yogurt
My day was going well until... people
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Re: Whuh??

#7

Post by Bigzmey »


Lady Fraktor wrote: Sun Feb 20, 2022 5:48 pm I use Zeiss wipes, for small jobs like this.
https://www.walmart.com/ip/ZEISS-Lens-W ... /698742370
What Gabby says. :)
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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.
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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.

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