Another 150 f5 question...

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DeanD
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Another 150 f5 question...

#1

Post by DeanD » Sun Nov 10, 2019 4:19 am

To all you DYI'ers out there: when I get the new focuser for the scope (as per my previous topic) I was thinking of doing a couple of other things: firstly spray-painting the larger collar that the focuser attaches to (with no spraying it would be blue scope, white collar and black focuser: hmmm), but more importantly I am thinking of (horror) cutting the tube down a bit so that my bino-viewer comes to focus.

Has anyone tried this, and if so are there any nasty surprises I need to be aware of? I am a bit worried about mucking up the collimation by not getting the cut perfectly square...

Again, all comments (including "You are nuts!") gratefully received.

Thanks in advance,

Dean

(PS: actually spray painting the tube might be nice too: I am not fond of the native blue. Gabby's hot orange looked interesting, or maybe ultra-metallic red or... Besides which, everyone knows that the colour of the scope makes all the difference to the views through it! ;) )
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: Another 150 f5 question...

#2

Post by Lady Fraktor » Sun Nov 10, 2019 5:45 am

Painting is the easy part :)
Do you have an idea of how much you would need to cut the tube to make it BV friendly?
A simple wrap around and taking your time with cutting there should be no issues keeping it square.
Proper Telescopes: Antares 105 f/15, 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: 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: Another 150 f5 question...

#3

Post by OzEclipse » Sun Nov 10, 2019 6:09 am

DeanD wrote:
Sun Nov 10, 2019 4:19 am
Has anyone tried this, and if so are there any nasty surprises I need to be aware of? I am a bit worried about mucking up the collimation by not getting the cut perfectly square...
Clamp the tube securely. Mark the cut accurately. Stand in a balanced position to one side. Hold the saw front vertical and rear handle so that both arms are holding comfortably. Keep the saw vertical. Rock your body back and forth to cut rather than pushing with the arms. Let the saw cut the tube, don't push down, just back and forth and you'll get a nice straight cut.

Before you cut you can also measure and mark the screw holes relative to the original rear end of the tube prior to cutting.

Joe
40 years in amateur astronomy - 1978-2018
Astronomical interests : astrophotography, visual observing, night-scapes, solar eclipse chasing, asteroidal occultations
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web site : http://joe-cali.com/
SCOPES - ATM 18" Dob, Vixen VC200L, ATM 6"f7, ED80
CAMERAS : Pentax K1, K5, K01 / VIDEO CAMS : TacosBD, Lihmsec
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Re: Another 150 f5 question...

#4

Post by DeanD » Sun Nov 10, 2019 6:31 am

OzEclipse wrote:
Sun Nov 10, 2019 6:09 am
DeanD wrote:
Sun Nov 10, 2019 4:19 am
Has anyone tried this, and if so are there any nasty surprises I need to be aware of? I am a bit worried about mucking up the collimation by not getting the cut perfectly square...
Clamp the tube securely. Mark the cut accurately. Stand in a balanced position to one side. Hold the saw front vertical and rear handle so that both arms are holding comfortably. Keep the saw vertical. Rock your body back and forth to cut rather than pushing with the arms. Let the saw cut the tube, don't push down, just back and forth and you'll get a nice straight cut.

Before you cut you can also measure and mark the screw holes relative to the original rear end of the tube prior to cutting.

Joe

Thanks Joe,

I'm good with cutting wood nice and square: but my hacksaw loves going sideways! I think some practice runs might be in order (or a new hacksaw)! ;)

Thanks for the idea re the screw holes: if they are accurate then the actual cut is not quite so critical...
Last edited by DeanD on Sun Nov 10, 2019 6:38 am, edited 4 times in total.
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: Another 150 f5 question...

#5

Post by DeanD » Sun Nov 10, 2019 6:33 am

Lady Fraktor wrote:
Sun Nov 10, 2019 5:45 am
Painting is the easy part :)
Do you have an idea of how much you would need to cut the tube to make it BV friendly?
A simple wrap around and taking your time with cutting there should be no issues keeping it square.
Thanks Gabby,

I haven't done the measurements yet: waiting to see how long the new focuser is. As for "A simple wrap around and taking your time with cutting there should be no issues keeping it square." - that sounds like famous last words to me! ;)
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: Another 150 f5 question...

#6

Post by Lady Fraktor » Sun Nov 10, 2019 6:36 am

Cutting the tube is quite easy, I use a angle grinder with a zip cut blade. Patience and no rushing :)
The rear baffle may be lost if shortening the tube but probably will not matter very much.
Proper Telescopes: Antares 105 f/15, 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: 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: Another 150 f5 question...

#7

Post by Arsene37 » Sun Nov 10, 2019 9:36 am

Hello !
Don't trash the small part of the tube ("à tout hasard" : it may be useful in case you change your mind … )
Enjoy the DIY !
Arsène
Petzval quadruplet 152/760 on iOptron CEM25P — XX12 Orion Skyquest — 5.5" Celestron Comet Catcher (40 years old) — Perl-Vixen 130 mm/720 mm EQ — 8 mmm, 17mm and 31 mm aspheric Hyperion — BST Explorer ED 5 mm — Baader MPCC II — Leica EP 20x-60x — 2x Barlow — TS Optics Binoculars 20x80 Triplet.
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Re: Another 150 f5 question...

#8

Post by DeanD » Mon Nov 11, 2019 6:05 am

The focuser has arrived: and it took about 60 seconds to attach; a very pleasant change! It looks well made (as most GSO things seem to be for their price) and it is around 30mm shorter than the original, so I am crossing my fingers that it might even come to focus with the binoviewer (but I guess that is too much to hope for!). No cutting just yet!!!

Of course we have 100% cloud cover for the foreseeable future, so no checking of focus to infinity tonight...
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: Another 150 f5 question...

#9

Post by notFritzArgelander » Mon Nov 11, 2019 6:27 am

You know Baader has those optical couplers that let you reach focus without tube cutting.... Have you considered those? Just asking...
Scopes: Refractors: Orion ST80, SV ED80 A f7; Newtonians: Z12 f5; Catadioptrics: VMC110L, Intes MK66. EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion Sirius EQG
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Re: Another 150 f5 question...

#10

Post by DeanD » Mon Nov 11, 2019 7:53 am

notFritzArgelander wrote:
Mon Nov 11, 2019 6:27 am
You know Baader has those optical couplers that let you reach focus without tube cutting.... Have you considered those? Just asking...
Thanks for this: but it depends on how far in the focus is. I have various attachments that give me about 35mm in travel compared to the standard. I'll have a play soon and publish my results! :)
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: Another 150 f5 question...

#11

Post by Lady Fraktor » Mon Nov 11, 2019 6:06 pm

DeanD wrote:
Mon Nov 11, 2019 6:05 am
The focuser has arrived: and it took about 60 seconds to attach; a very pleasant change! It looks well made (as most GSO things seem to be for their price) and it is around 30mm shorter than the original, so I am crossing my fingers that it might even come to focus with the binoviewer (but I guess that is too much to hope for!). No cutting just yet!!!

Of course we have 100% cloud cover for the foreseeable future, so no checking of focus to infinity tonight...
Clouds will give you time to verify the new focuser is aligned with the telescope tube :)
Proper Telescopes: Antares 105 f/15, 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: 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: Another 150 f5 question...

#12

Post by Bigzmey » Mon Nov 11, 2019 11:58 pm

I thought blue/white/black combo is classy, no? :D
Scopes: Stellarvue: SV102 ED F7; Celestron: 8" SCT F10, Omni 150R Achro F5, Onyx 80ED F6.3, Mak 127mm F12; Meade: ST80 F5. Mounts: ES Twilight I, Bresser EXOS2, SW SkyTee2, AzGTi, UA MicroStar. Binos: Orion 15x70, 10x50, Nikon 8x40. EPs: Pentax: XWs; TeleVue: Delites, Plossls & barlows; ES: 68s; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV; Meade: UWAs & Plossls. Diagonals: Baader: BBHS mirror, Zeiss Spec prism, Clicklock; TeleVue: Evebrite. Filters: Lumicon, Baader, Astronomik. DSO tally: 1661 (Completed: M110, H1, H2. In progress: H3: 195, H2,500: 1241, S110: 77). Doubles: 905, Comets: 13, Asteroids: 62
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