Finder attachment for 150mm f5?

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DeanD
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Finder attachment for 150mm f5?

#1

Post by DeanD »

Hi Folks,

I am considering getting a replacement GSO 10:1 crayford focuser for my Celestron XLT 150mm f5 achromat, but one issue is that the stock focuser has a built-in attachment point for the shoe of the finder scope. The GSO replacement doesn't, and there is no other easy spot to attach the finder on the scope. I could make an attachment to sit it on the mount brackets, but this is a pain if I want to rotate the tube (eg: when I attach the scope by the side to my M2 or iOptron alt-az mounts).

So, I am just wondering if anyone out there has done something like this with a focuser replacement, and what you did for the finder? I am thinking of getting a red-dot finder of some sort instead of the 8x50 straight-through one that came with the scope.

All thoughts gratefully accepted!

Thanks,

Dean
Telescopes: 12" f5 dob, Celestron CPC800, 150mmf5 Celestron achro, Tak TSA102, TV76, ETX125...
Binos: Tak 22x60, Swarovski 8x30 Habicht, FB 25x100, Orion Regulux 15x70...
Eyepieces: way too many (is that possible?), but I do like my TV 32mm plossl, 13mm Nagler T6, 27mm Panoptic and 3-6mm Nagler zoom, plus Fujiyama 18mm and 25mm orthos and Tak 7.5mm LE
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John Baars
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Re: Finder attachment for 150mm f5?

#2

Post by John Baars »

Hi Dean,
My f/5 came with an extra dovetail-bar. I put in some extra nuts so I could use it as a handle -bar. Furthermore I drilled and tapped two extra holes to install a Telrad base on it. The Telrad works fine, but any other RDF will do of course. Problem stays that it won't rotate.
IMG_1263 (640x480).jpg
For rotation one must attach a finder-base to the telescope itself or to the focusser. I am not in need of this, but lately I found out, while working on the further blackening of the inside-focusser, there is more than enough room for drilling and tapping two extra M5 or M6 holes. Or even a M5 nut on the inside, in case you have no M5 taps.
IMG_1265 (640x480).jpg
Last edited by John Baars on Wed Nov 06, 2019 8:17 am, edited 1 time in total.
Telescopes in Schiedam : SW 150mm Achromat F/5, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 Maksutov F/14.3, SW 102 Maksutov F/13 on Vixen GPDX.
Eyepieces: Kitakaru, Eudiascopic, Panoptic, Morpheus, Nagler, Leica ASPH zoom, CZJena, Brandon, Parks, Fujiyama, Pentax XO5 and XO2.5 .
Binoculars: Kasai 2.3X40, AusJena 10X50 Jenoptem, Swarovski Habicht 7X42, Celestron Skymaster 15X70, Swift Observation 20X80.

Astronomical Rijswijk observatory telescopes: Astro-Physics Starfire 130 f/8 on NEQ6, 6 inch Newton on GP, C8 on NEQ6, Meade 14 inch SCT on EQ8, Lunt.

Amateur since 1970.
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Lady Fraktor
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Re: Finder attachment for 150mm f5?

#3

Post by Lady Fraktor »

As well as John two examples there is also bolting it directly to the tube in front of the focuser flange.
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Proper Telescopes: Antares 105 f/15, Bresser 102 f/13.2, Celestron 150 f/8, Stellarvue NHNGDX 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen ED115s f/7.7
Mounts: Berlebach Planet w/ pier, Celestron AS-GT, Celestron CG-5 w/ Argo Navis & tracking motor, SLT w/ pier & tripod mods, Manfrotto 028b w/ SV M2C, Mantrotto 055Pro w/ 128RC, TAL MT1C, Vixen SXP w/ HAL-130 & half pier
Diagonal: 2" A-P Maxbright, 2" Baader Herschel Wedge (P), 2" Zeiss/ Baader Amici Prism (DX2), 2" Orion Amici Prism, 2" Stellarvue DX, 2" TeleVue EverBrite
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Re: Finder attachment for 150mm f5?

#4

Post by mariosi »

20190707_095830.jpg
IMG-d1f93ead051936a78fe0eff768b09895-V.jpg
Image
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Don Alvarez
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Re: Finder attachment for 150mm f5?

#5

Post by Don Alvarez »

DeanD wrote:
Wed Nov 06, 2019 4:54 am
So, I am just wondering if anyone out there has done something like this with a focuser replacement, and what you did for the finder? I am thinking of getting a red-dot finder of some sort instead of the 8x50 straight-through one that came with the scope.
I have replaced two focusers with GSO units. There is a finder shoe made for them:

https://agenaastro.com/agena-finder-mou ... users.html

No modifications required. Single screw to install and the "rails" on the bottom of the shoe make sure it is lined up in the right direction. I use RACI's on these, so a red dot should be no issue.
Telescopes: 10" SkyLine Dobsonian, 6" Apertura F5 Newt, Celestron Nextar GT90, Meade Infinity 80
EP: 5.5mm, 8.8mm, 14mm, 20mm, 24mm Meade 5000 UWA's, BCO's w/ Q-Turret, 26mm, 32mm, 40mm Meade 4000 Plossls, Orion Expanse, 30mm, 20mm, 15mm GSO Superview, Various others.
Binocs: 15x70 Celestron Skymaster, 10x50 Levenhuk Karma Pro, 10x42 Bushnell, 8x42 Sans & Streiffe
Mounts: Meade LX70 with dual axis motors, Celestron GT, More miscellaneous tripods than a Martian invasion.

"The heavens themselves, the planets, and this center observe degree, priority, and place,
Insisture, course, proportion, season, form, office, and custom, in all line of order.”
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Re: Finder attachment for 150mm f5?

#6

Post by Don Quixote »

mariosi wrote:
Wed Nov 06, 2019 2:17 pm
20190707_095830.jpg

IMG-d1f93ead051936a78fe0eff768b09895-V.jpg
Very nice Mariosi !
Thank you for imaging this here.
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Bigzmey
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Re: Finder attachment for 150mm f5?

#7

Post by Bigzmey »

I had regular and linear bearing GSO Crayford focusers on my 150ST. You can attached finder base via single screw to both. I will snap some pics.

Here is the base I use.

https://www.ebay.com/itm/Multi-Function ... SwXaRaBrRh
Scopes: Stellarvue: SV102 ED F7; Celestron: 9.25" EdgeHD F10, 8" SCT F10, 6" SCT F10, Omni XLT 150R Achro F5, Onyx 80ED F6.3; Meade: 80ST Achro F5.
Mounts: ES: Twilight I; Bresser: EXOS2; SW: SkyTee2, AzGTi; UA: MicroStar.
Binos: Orion: Little Giant II 15x70, WorldView 10x50, Nikon: Action EX 16x50 & 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68s; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV; Russell Optics: SuperPlossls.
Diagonals: Baader: BBHS silver mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 1805 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1377, S110: 77). Doubles: 1341, Comets: 15, Asteroids: 78
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DeanD
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Re: Finder attachment for 150mm f5?

#8

Post by DeanD »

Thanks to all for responding. It is always great to get other peoples' ideas: sometimes you just miss the obvious! :)

I was procrastinating about getting the focuser, but you have encouraged me (don't tell the finance department though! ;) )

Thanks again, and all the best,

Dean
Telescopes: 12" f5 dob, Celestron CPC800, 150mmf5 Celestron achro, Tak TSA102, TV76, ETX125...
Binos: Tak 22x60, Swarovski 8x30 Habicht, FB 25x100, Orion Regulux 15x70...
Eyepieces: way too many (is that possible?), but I do like my TV 32mm plossl, 13mm Nagler T6, 27mm Panoptic and 3-6mm Nagler zoom, plus Fujiyama 18mm and 25mm orthos and Tak 7.5mm LE
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Doug James
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Re: Finder attachment for 150mm f5?

#9

Post by Doug James »

Keep use updated with what you end up doing with the upgrade to your 150mm. Good post, thanks
Celestron Omni XLT 120 Refractor, Orion XT8 Classic Dobsonian - Telrad finder - Sirius Plossl 1.25" eyepieces 40mm,25mm,17mm,
Shorty 2x Barlow lens, Orion Stratus 8mm,13mm,21mm, Baader 36mm, Meade 6.5mm,
Binoculars, Nikon 10x50, Oberwerk 20x80 LW binos
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Don Alvarez
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Re: Finder attachment for 150mm f5?

#10

Post by Don Alvarez »

DeanD wrote:
Wed Nov 06, 2019 10:15 pm
Thanks to all for responding. It is always great to get other peoples' ideas: sometimes you just miss the obvious! :)

I was procrastinating about getting the focuser, but you have encouraged me (don't tell the finance department though! ;) )

Thanks again, and all the best,

Dean
It is a good upgrade to do. The GSO focuser is muuuuuuch nicer than factory rack and pinion ones.

I might actually prefer the shoe that Bigz linked. The slots will let you center the screw better than the GSO shoe.
Telescopes: 10" SkyLine Dobsonian, 6" Apertura F5 Newt, Celestron Nextar GT90, Meade Infinity 80
EP: 5.5mm, 8.8mm, 14mm, 20mm, 24mm Meade 5000 UWA's, BCO's w/ Q-Turret, 26mm, 32mm, 40mm Meade 4000 Plossls, Orion Expanse, 30mm, 20mm, 15mm GSO Superview, Various others.
Binocs: 15x70 Celestron Skymaster, 10x50 Levenhuk Karma Pro, 10x42 Bushnell, 8x42 Sans & Streiffe
Mounts: Meade LX70 with dual axis motors, Celestron GT, More miscellaneous tripods than a Martian invasion.

"The heavens themselves, the planets, and this center observe degree, priority, and place,
Insisture, course, proportion, season, form, office, and custom, in all line of order.”
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Re: Finder attachment for 150mm f5?

#11

Post by Bigzmey »

Don Alvarez wrote:
Thu Nov 07, 2019 3:35 pm
DeanD wrote:
Wed Nov 06, 2019 10:15 pm
Thanks to all for responding. It is always great to get other peoples' ideas: sometimes you just miss the obvious! :)

I was procrastinating about getting the focuser, but you have encouraged me (don't tell the finance department though! ;) )

Thanks again, and all the best,

Dean
It is a good upgrade to do. The GSO focuser is muuuuuuch nicer than factory rack and pinion ones.

I might actually prefer the shoe that Bigz linked. The slots will let you center the screw better than the GSO shoe.
I prefer this cross slot shoe design over the others. It fits all my scopes from 8" SCT and 150ST to 127mm Mak and 80mm ED perfectly.
Scopes: Stellarvue: SV102 ED F7; Celestron: 9.25" EdgeHD F10, 8" SCT F10, 6" SCT F10, Omni XLT 150R Achro F5, Onyx 80ED F6.3; Meade: 80ST Achro F5.
Mounts: ES: Twilight I; Bresser: EXOS2; SW: SkyTee2, AzGTi; UA: MicroStar.
Binos: Orion: Little Giant II 15x70, WorldView 10x50, Nikon: Action EX 16x50 & 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68s; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV; Russell Optics: SuperPlossls.
Diagonals: Baader: BBHS silver mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 1805 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1377, S110: 77). Doubles: 1341, Comets: 15, Asteroids: 78
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DeanD
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Re: Finder attachment for 150mm f5?

#12

Post by DeanD »

Bigzmey wrote:
Thu Nov 07, 2019 7:36 pm
Don Alvarez wrote:
Thu Nov 07, 2019 3:35 pm
DeanD wrote:
Wed Nov 06, 2019 10:15 pm
Thanks to all for responding. It is always great to get other peoples' ideas: sometimes you just miss the obvious! :)

I was procrastinating about getting the focuser, but you have encouraged me (don't tell the finance department though! ;) )

Thanks again, and all the best,

Dean
It is a good upgrade to do. The GSO focuser is muuuuuuch nicer than factory rack and pinion ones.

I might actually prefer the shoe that Bigz linked. The slots will let you center the screw better than the GSO shoe.
I prefer this cross slot shoe design over the others. It fits all my scopes from 8" SCT and 150ST to 127mm Mak and 80mm ED perfectly.
I have ordered one, thanks! Hopefully it will arrive quicker than my last order from China. I am still waiting on that one from February!

I am undecided about the finder itself. I will wait until I have attached the new focuser: which should arrive on Monday.

Thanks again folks.
Telescopes: 12" f5 dob, Celestron CPC800, 150mmf5 Celestron achro, Tak TSA102, TV76, ETX125...
Binos: Tak 22x60, Swarovski 8x30 Habicht, FB 25x100, Orion Regulux 15x70...
Eyepieces: way too many (is that possible?), but I do like my TV 32mm plossl, 13mm Nagler T6, 27mm Panoptic and 3-6mm Nagler zoom, plus Fujiyama 18mm and 25mm orthos and Tak 7.5mm LE
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Re: Finder attachment for 150mm f5?

#13

Post by OzEclipse »

DeanD wrote:
Fri Nov 08, 2019 12:24 am

I have ordered one, thanks! Hopefully it will arrive quicker than my last order from China. I am still waiting on that one from February!
I ordered some large format film from Teds Camera store in October. Still waiting. Have since sold the large format camera. Converted to digital cameras. So hoping they don't call up to say my order has arrived. I'm not worried.

..........it wasn't October 2019, it was October 1997 :lol: :lol: :lol: :lol:

Joe
Amateur astronomer since 1978
Astronomical interests : astrophotography, visual observing, nightscape photography, solar eclipse chasing
asteroidal occultations, nightscape astrophotography workshops
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web site : http://joe-cali.com/
SCOPES - ATM 18" Dob, Vixen VC200L, ATM 6"f7, ED80
MOUNTS- EM-200, iEQ45, Push dobsonian with Nexus DSC
CAMERAS : Pentax K1, K5, K01 / VIDEO CAMS : TacosBD, Lihmsec
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