some temptations are too cruel
-
- Articles: 0
- Posts: 329
- Joined: Sat May 25, 2019 6:20 am
- 4
- Location: NSW Rural (Aust)
- Status:
Offline
some temptations are too cruel
https://www.astrobuysell.com/uk/propvie ... iew=151282
Cameras - Blads, D70s, D3300, Lunar and Planetary Cameras (2)
DIY Glass - German military and opthalmic sourced items, AGFA AVIPHOT DIA C
- notFritzArgelander
- In Memory
- Articles: 0
- Posts: 14925
- Joined: Fri May 10, 2019 4:13 pm
- 4
- Location: Idaho US
- Status:
Offline
-
TSS Awards Badges
Re: some temptations are too cruel
- Thefatkitty
- Co-Administrator
- Articles: 0
- Posts: 4328
- Joined: Sat May 11, 2019 4:20 pm
- 4
- Location: Ontario, Canada
- Status:
Offline
-
TSS Photo of the Day
TSS Awards Badges
Re: some temptations are too cruel
Still, to collimate that at
Would be a fun project though if you have the room!
All the best and I seriously hope you get it!
"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.
Member of the RASC
-
- Articles: 0
- Posts: 329
- Joined: Sat May 25, 2019 6:20 am
- 4
- Location: NSW Rural (Aust)
- Status:
Offline
Re: some temptations are too cruel
I'm just thinking; how much would it cost for gold coatings for IR use??? . I must have a serious injury wish.
Back to plotting!
Cameras - Blads, D70s, D3300, Lunar and Planetary Cameras (2)
DIY Glass - German military and opthalmic sourced items, AGFA AVIPHOT DIA C
- notFritzArgelander
- In Memory
- Articles: 0
- Posts: 14925
- Joined: Fri May 10, 2019 4:13 pm
- 4
- Location: Idaho US
- Status:
Offline
-
TSS Awards Badges
Re: some temptations are too cruel
Think of it this way.... If you survive, you're certain that you're alive!mcolbert wrote: ↑Tue Aug 20, 2019 4:28 am thanks guys - on the one hand I have you encouraging me and on the other, my wife's silent 'look'. I can feel it even though she's teaching class at the moment!
I'm just thinking; how much would it cost for gold coatings for IR use??? . I must have a serious injury wish.
Back to plotting!
- Lady Fraktor
- Articles: 0
- Posts: 10022
- Joined: Mon Apr 29, 2019 9:14 pm
- 5
- Location: Slovakia
- Status:
Offline
Re: some temptations are too cruel
See Far Sticks: Elita 103/1575, AOM FLT 105/1000, Bresser 127/1200 BV, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS 100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, SXP2, AXJ, AXD
Az/Alt: AYO Digi II, Stellarvue M2C, Argo Navis encoders on both
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, Tak prism, TAL, Vixen
Eyepieces: Antares to Zeiss (1000101)
The only culture I have is from yogurt
-
- Articles: 0
- Posts: 329
- Joined: Sat May 25, 2019 6:20 am
- 4
- Location: NSW Rural (Aust)
- Status:
Offline
Re: some temptations are too cruel
ah but would I be able to enjoy the mirror???? Now there's the question.notFritzArgelander wrote: ↑Tue Aug 20, 2019 5:03 amThink of it this way.... If you survive, you're certain that you're alive!mcolbert wrote: ↑Tue Aug 20, 2019 4:28 am thanks guys - on the one hand I have you encouraging me and on the other, my wife's silent 'look'. I can feel it even though she's teaching class at the moment!
I'm just thinking; how much would it cost for gold coatings for IR use??? . I must have a serious injury wish.
Back to plotting!
Cameras - Blads, D70s, D3300, Lunar and Planetary Cameras (2)
DIY Glass - German military and opthalmic sourced items, AGFA AVIPHOT DIA C
- Kanadalainen
- Articles: 0
- Posts: 1849
- Joined: Sat May 11, 2019 8:05 pm
- 4
- Location: Winnipeg, Canada
- Status:
Offline
-
TSS Awards Badges
TSS Photo of the Day
Re: some temptations are too cruel
Even at 43 mm thick, this big boy might flex enough to require a massive supporting series of blocks behind it. A tree of triangles.
Coating something that huge will run into a lot of money.
The focal ratio is actually long for such a huge mirror. You will have
But I totally understand the lure of something like this,
Maybe check around for someone who could supply a slumped blank for a meniscus mirror. With the basic spherical shape already there, then you could polish it to a parabola yourself (after building a Foucault and a bath interferometer)!
Fracs: Stellarvue 70T f6; SW 120mm Esprit f7; "Mark Mk. II" - 60 mm Tasco f6; C80 frac f 11.4
SCT: C8 Edge f10 or f7 with reducer
Dob: 14.5" homebuilt strut dob (f4.5 ZOC mirror), Nexus II, Moonlite focuser
Mounts - Ioptron Skyguider pro, Astro Physics GTO900
Cameras and lenses - ZWO 2600 mc, 290 mm mini, Canon 60D modded with Rokinon 10mm 2.8; Rokinon 135mm f2
Skysafari 6 Pro, Astro Pixel Processor, Pixinsight - using Mac tablet and ASIair pro to run the AP rig.
"Mothers! It is there!" - Rafael Gonzales-Acuna, 2018.
- KingNothing13 Online
- Moderator
- Articles: 0
- Posts: 1718
- Joined: Wed Jun 19, 2019 4:54 pm
- 4
- Location: Western Mass
- Status:
Online
-
TSS Awards Badges
Re: some temptations are too cruel
Wow - how far mirror making has come - that this would be a possibility!Kanadalainen wrote: ↑Tue Aug 20, 2019 1:03 pm You will have coma at 4.7 anyway, so its better to hit the mid 3's or even low 3's so that you don't need a huge ladder to reach the eyepiece.
Scope: Apertura AD10 with Nexus II with 8192/716000 Step Encoders
EPs: ES 82* 18mm, 11mm, 6.7mm; GSO 30mm
Celestron SkyMaster 15x70 Binoculars
List Counts: Messier: 75; Herschel 400: 30; Caldwell: 12; AL Carbon Star List: 16
Brett's Carbon Star Hunt
- Kanadalainen
- Articles: 0
- Posts: 1849
- Joined: Sat May 11, 2019 8:05 pm
- 4
- Location: Winnipeg, Canada
- Status:
Offline
-
TSS Awards Badges
TSS Photo of the Day
Re: some temptations are too cruel
He provides a beautiful description of the trend for main mirror F ratio changes over the past few decades, and suggests that
http://www.bbastrodesigns.com/ZipDob/ZipDob.html
Fracs: Stellarvue 70T f6; SW 120mm Esprit f7; "Mark Mk. II" - 60 mm Tasco f6; C80 frac f 11.4
SCT: C8 Edge f10 or f7 with reducer
Dob: 14.5" homebuilt strut dob (f4.5 ZOC mirror), Nexus II, Moonlite focuser
Mounts - Ioptron Skyguider pro, Astro Physics GTO900
Cameras and lenses - ZWO 2600 mc, 290 mm mini, Canon 60D modded with Rokinon 10mm 2.8; Rokinon 135mm f2
Skysafari 6 Pro, Astro Pixel Processor, Pixinsight - using Mac tablet and ASIair pro to run the AP rig.
"Mothers! It is there!" - Rafael Gonzales-Acuna, 2018.
-
- Articles: 0
- Posts: 329
- Joined: Sat May 25, 2019 6:20 am
- 4
- Location: NSW Rural (Aust)
- Status:
Offline
Re: some temptations are too cruel
no worries about thinking of your comments being criticism - in the negative sense that is. I read them as considered opinions highly constructive in nature and intent, so many thanks for that.Kanadalainen wrote: ↑Tue Aug 20, 2019 1:03 pm Not to throw a wet blanket on this cool idea, but here are a couple of things to think about (not to be taken as criticism):
Even at 43 mm thick, this big boy might flex enough to require a massive supporting series of blocks behind it. A tree of triangles.
Coating something that huge will run into a lot of money.
The focal ratio is actually long for such a huge mirror. You will have coma at 4.7 anyway, so its better to hit the mid 3's or even low 3's so that you don't need a huge ladder to reach the eyepiece. Also a great coma corrector (for coma) and fantastic eyepieces would be needed to keep the FOV happy.
But I totally understand the lure of something like this, ha ha. Practicality be damned.
Maybe check around for someone who could supply a slumped blank for a meniscus mirror. With the basic spherical shape already there, then you could polish it to a parabola yourself (after building a Foucault and a bath interferometer)!
I agree that there would be a lot of work to be done, with a magnificent instrument at the end of the day, something which would outlive my efforts - part of a legacy that ATMers leave behind.
I don't know if a
Coatings would be expensive, yes, the challenge would be more to find someone capable of doing them. I have one lead, the company which made the
Now to spend the day looking at InGaAs cameras. Thanks!
Cameras - Blads, D70s, D3300, Lunar and Planetary Cameras (2)
DIY Glass - German military and opthalmic sourced items, AGFA AVIPHOT DIA C
-
- Articles: 0
- Posts: 329
- Joined: Sat May 25, 2019 6:20 am
- 4
- Location: NSW Rural (Aust)
- Status:
Offline
Re: some temptations are too cruel
Lady Fraktor wrote: ↑Tue Aug 20, 2019 5:04 am Shipping a 800mm x 43mm piece of glass from UK to Australia... It may be cheaper to make your own glass
I think the problem is one of where to find a company that can produce blanks of that size. I wouldn't be surprised if there were simply no companies doing that here in this country. As one example it took several weeks to find someone to do the
Cameras - Blads, D70s, D3300, Lunar and Planetary Cameras (2)
DIY Glass - German military and opthalmic sourced items, AGFA AVIPHOT DIA C
- Kanadalainen
- Articles: 0
- Posts: 1849
- Joined: Sat May 11, 2019 8:05 pm
- 4
- Location: Winnipeg, Canada
- Status:
Offline
-
TSS Awards Badges
TSS Photo of the Day
Re: some temptations are too cruel
Best line I've heard on this board!!
Fracs: Stellarvue 70T f6; SW 120mm Esprit f7; "Mark Mk. II" - 60 mm Tasco f6; C80 frac f 11.4
SCT: C8 Edge f10 or f7 with reducer
Dob: 14.5" homebuilt strut dob (f4.5 ZOC mirror), Nexus II, Moonlite focuser
Mounts - Ioptron Skyguider pro, Astro Physics GTO900
Cameras and lenses - ZWO 2600 mc, 290 mm mini, Canon 60D modded with Rokinon 10mm 2.8; Rokinon 135mm f2
Skysafari 6 Pro, Astro Pixel Processor, Pixinsight - using Mac tablet and ASIair pro to run the AP rig.
"Mothers! It is there!" - Rafael Gonzales-Acuna, 2018.
- ARock
- Articles: 0
- Posts: 363
- Joined: Mon May 13, 2019 4:06 am
- 4
- Location: USA
- Status:
Offline
-
TSS Awards Badges
Re: some temptations are too cruel
https://cosmoquest.org/x/blog/2017/04/n ... telescope/
Scopes: Zhumell Z8, Meade Adventure 80mm, Bushnell 1300x100 Goto Mak.
Mount: ES EXOS Nano EQ Mount, DIY Arduino+Stepper drives.
AP: 50mm guidescope, AR0130 based guidecam, Canon T3i, UHC filter.
EPs: ES82 18,11,6.7mm, Zhumell 30,9mm FJ Ortho 9mm, assorted plossls, Meade 2x S-F Barlow, DGM NPB filter.
Binos: Celestron Skymaster 15x70 (Albott tripod/monopod), Nikon Naturalist 7x35.
-
- Articles: 0
- Posts: 329
- Joined: Sat May 25, 2019 6:20 am
- 4
- Location: NSW Rural (Aust)
- Status:
Offline
Re: some temptations are too cruel
Cameras - Blads, D70s, D3300, Lunar and Planetary Cameras (2)
DIY Glass - German military and opthalmic sourced items, AGFA AVIPHOT DIA C
-
- Articles: 0
- Posts: 329
- Joined: Sat May 25, 2019 6:20 am
- 4
- Location: NSW Rural (Aust)
- Status:
Offline
Re: some temptations are too cruel
well we try to entertain.
Cameras - Blads, D70s, D3300, Lunar and Planetary Cameras (2)
DIY Glass - German military and opthalmic sourced items, AGFA AVIPHOT DIA C
- DeanD
- Articles: 0
- Posts: 666
- Joined: Fri May 17, 2019 7:27 am
- 4
- Location: Adelaide South Australia
- Status:
Offline
-
TSS Awards Badges
Re: some temptations are too cruel
Seriously though, if it is plate glass that is 43mm thick at the edge and it wasn't pre-slumped before it was figured then it will only be around 32mm thick in the centre. Hmmm. Good luck trying to get that down to f3!
The cost for the final scope would be way more than the tiny (comparative) amount you would pay for the glass.
As a comparison, the Astro Society of South Aust. (ASSA) was working on building a telescope with a 36" f3-ish 6" thick mirror (ex- Woomera rocket range) for many years. The project is now on indefinite hold because the costs were getting over the $100,000 mark...
Although, if you are very serious about such a scope there is a big bit of largely figured glass sitting over here in Adelaide...
Good luck!!!
- Dean
Binos: Steiner Wildlife XP 10x26, Swarovski 8x30 Habicht, Zeiss SFL 8x40, Vanguard Endeavour 10.5x45, Fuji FMTR-SX 10x50, Tak 22x60, Orion Resolux 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
- yobbo89
- Moderator
- Articles: 0
- Posts: 2604
- Joined: Sat May 11, 2019 7:44 pm
- 4
- Location: australia qld brisbane
- Status:
Offline
-
TSS Photo of the Day
Re: some temptations are too cruel
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
Create an account or sign in to join the discussion
You need to be a member in order to post a reply
Create an account
Not a member? register to join our community
Members can start their own topics & subscribe to topics
It’s free and only takes a minute