Filter question.

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Jnicholes United States of America
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Filter question.

#1

Post by Jnicholes »


So, I was going through my storage, and I found these. I forgot I had them.
image.jpg
I know what the one labeled “moon” is for, it’s obviously a lunar filter. I don’t know what the others are for, though. The red one is labeled Celestron filter number 25, and the blue one is labeled Celestron filter number 80a.

Could someone tells me what these two filters are used for?

Any help will be appreciated,

Jared
Celestron Nexstar 8SE Schmidt Cassegrain Telescope
25mm plossl Eyepiece
Goto mount
Iphone 11 Nightcap app Camera

"Our minds are finite, and yet even in these circumstances of finitude we are surrounded by possibilities that are infinite, and the purpose of life is to grasp as much as we can out of that infinitude."

Alfred North Whitehead
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kt4hx United States of America
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Re: Filter question.

#2

Post by kt4hx »


Hi Jared. Other than the neutral density lunar filter you mention, the numbered ones are "Wratten" filters used primarily for observing planets. I am not a real planetary or lunar observer, so my experience with them is limited. Here is a link that will give you some idea of what the filters you have are used for in general. I know there are others here who could give you more in depth information, and hopefully they will weigh in. Hope this helps a little.

https://britastro.org/node/13609
Alan

Scopes: Astro Sky 17.5 f/4.5 Dob || Apertura AD12 f/5 Dob || Zhumell Z10 f/4.9 Dob ||
ES AR127 f/6.5 || ES ED80 f/6 || Apertura 6" f/5 Newtonian
Mounts: ES Twilight-II and Twilight-I
EPs: AT 82° 28mm UWA || TV Ethos 100° 21mm and 13mm || Vixen LVW 65° 22mm ||
ES 82° 18mm || Pentax XW 70° 10mm, 7mm and 5mm || barlows
Filters (2 inch): DGM NPB || Orion Ultra Block, O-III and Sky Glow || Baader HaB
Primary Field Atlases: Uranometria All-Sky Edition and Interstellarum Deep Sky Atlas
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"Astronomers, we look into the past to see our future." (me)
"Seeing is in some respect an art, which must be learnt." (William Herschel)
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Bigzmey United States of America
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Re: Filter question.

#3

Post by Bigzmey »


Here is another good reference site

https://agenaastro.com/articles/choosin ... ilter.html

I find dark blue filter useful for Venus and red filter for Mars.
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.
EPs: Pentax: XWs & XFs; TeleVue: Delites, 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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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GCoyote United States of America
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Re: Filter question.

#4

Post by GCoyote »


Bigzmey wrote: Thu Jul 08, 2021 9:19 pm Here is another good reference site

https://agenaastro.com/articles/choosin ... ilter.html

I find dark blue filter useful for Venus and red filter for Mars.
Good to hear, just got one of each. :idea:
Any metaphor will tear if stretched over too much reality.
Gary C

Celestron Astro Master 130mm f5 Newtonian GEM
Meade 114-EQ-DH f7.9 Newtonian w/ manual GEM
Bushnell 90mm f13.9 Catadioptric
Gskyer 80mm f5 Alt/Az refractor
Jason 10x50 Binoculars
Celestron 7x50 Binoculars
Svbony 2.1x42 Binoculars
(And a bunch of stuff I'm still trying to fix or find parts for.)
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Bigzmey United States of America
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Re: Filter question.

#5

Post by Bigzmey »


GCoyote wrote: Thu Jul 08, 2021 9:56 pm
Bigzmey wrote: Thu Jul 08, 2021 9:19 pm Here is another good reference site

https://agenaastro.com/articles/choosin ... ilter.html

I find dark blue filter useful for Venus and red filter for Mars.
Good to hear, just got one of each. :idea:
Since I don't take things for granted I spent a few planetary sessions playing with color filters. All filters cut glare (to a degree) but only blue filter made easier for me to detect Venus clouds during the last greatest elongation. For Mars during the last two oppositions out of all tried filters red (for smaller scopes) and dark red (for larger scopes) were the most useful in resolving Mars dark features.
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.
EPs: Pentax: XWs & XFs; TeleVue: Delites, 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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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GCoyote United States of America
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Re: Filter question.

#6

Post by GCoyote »


Sounds about right. I printed out the chart from the Agenaasstro.com link and keep it with my gear for reference.
Any metaphor will tear if stretched over too much reality.
Gary C

Celestron Astro Master 130mm f5 Newtonian GEM
Meade 114-EQ-DH f7.9 Newtonian w/ manual GEM
Bushnell 90mm f13.9 Catadioptric
Gskyer 80mm f5 Alt/Az refractor
Jason 10x50 Binoculars
Celestron 7x50 Binoculars
Svbony 2.1x42 Binoculars
(And a bunch of stuff I'm still trying to fix or find parts for.)
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