Lunt 60 - 127mm mod
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Re: Lunt 60 - 127mm mod
I guess the answer is try it with regards the stray light, see if it works. Never tried it myself in an open tube configuration so I don't know.
The mechanics of your drawing will be fine I think.
Regards the f- ratio thing. If the f-ratio is less than that of the collimating lens then there will be vignetting - by my calculations you'll be running at an effective aperture of ~100mm if the collimating lens on the Lunt is f7.5. You may also have issues with the bandpass getting wider across the fov as you get towards the edge, and also the bandpass shifting towards the red as you also get towards the edge of the fov. Basically the centre of the fov will show more detail than the edge.
You can work out how far the 127mm lens needs to sit in front of the Lunts collimating lens - my calcs put it at 543mm.
Also, you will need to unscrew the objective from the Lunt OTA...
Mark
The mechanics of your drawing will be fine I think.
Regards the f- ratio thing. If the f-ratio is less than that of the collimating lens then there will be vignetting - by my calculations you'll be running at an effective aperture of ~100mm if the collimating lens on the Lunt is f7.5. You may also have issues with the bandpass getting wider across the fov as you get towards the edge, and also the bandpass shifting towards the red as you also get towards the edge of the fov. Basically the centre of the fov will show more detail than the edge.
You can work out how far the 127mm lens needs to sit in front of the Lunts collimating lens - my calcs put it at 543mm.
Also, you will need to unscrew the objective from the Lunt OTA...
Mark
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Re: Lunt 60 - 127mm mod
Hi John
that is a very fine project. I did something like that 2 years ago and found that it helps if you add another ground plate on top of the "scope" in order to have a firm constellation which is not flexing too much. You can add very easely aperture stops down the light train if you have problems with straylight
that is a very fine project. I did something like that 2 years ago and found that it helps if you add another ground plate on top of the "scope" in order to have a firm constellation which is not flexing too much. You can add very easely aperture stops down the light train if you have problems with straylight
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Re: Lunt 60 - 127mm mod
Hi John
that is a fantastic construction. It's the way to go. Good luck
that is a fantastic construction. It's the way to go. Good luck
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
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Re: Lunt 60 - 127mm mod
sexy time 8)
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Re: Lunt 60 - 127mm mod
http://solarchat.solarastronomy.org/ind ... unt-etalon
See message #6249 for a summary....
The lunt objective seems to be around f4.5, so f5 should be OK. Check the distances..
Your set up is no different to an optical bench set-up - it will work. If needs be a black cloth will suppress any reflection issues...give it a go.
See message #6249 for a summary....
The lunt objective seems to be around f4.5, so f5 should be OK. Check the distances..
Your set up is no different to an optical bench set-up - it will work. If needs be a black cloth will suppress any reflection issues...give it a go.
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Re: Lunt 60 - 127mm mod
The 125 objective wil be pumping 430% more energy into the system....
Me, well I'd play it safe and have an ERF as close to the objective as possible.
You can always use a temporary aperture stop say, 70mm to test out the system.....
Me, well I'd play it safe and have an ERF as close to the objective as possible.
You can always use a temporary aperture stop say, 70mm to test out the system.....
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Re: Lunt 60 - 127mm mod
Do what Ralph did...just cut an aperture stop from some cardboard and give it a go!!!
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Re: Lunt 60 - 127mm mod
Definitely use an ERF
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Re: Lunt 60 - 127mm mod
Onwards and Upwards!
I'm 100% sure you'll get there.
I'm 100% sure you'll get there.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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Re: Lunt 60 - 127mm mod
Hi John
that lens looks good, very good ;-)
that lens looks good, very good ;-)
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
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Re: Lunt 60 - 127mm mod
Hi John
that depends only on your skill, not on the lens
that depends only on your skill, not on the lens
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
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Re: Lunt 60 - 127mm mod
John,
I know from Viljo's Lunt 60 mod that it can and does work!
Valery on another thread raises the issues of aberrations in the Lunt single objective being corrected by the front barlow in the etalon assembly, and when used with a doublet - overcorrects...
I know from Viljo's Lunt 60 mod that it can and does work!
Valery on another thread raises the issues of aberrations in the Lunt single objective being corrected by the front barlow in the etalon assembly, and when used with a doublet - overcorrects...
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: Lunt 60 - 127mm mod
It's all here, John:
http://solarchat.solarastronomy.org/ind ... unt-etalon
http://solarchat.solarastronomy.org/ind ... unt-etalon
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: Lunt 60 - 127mm mod
Great scope you and your father made John!
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Re: Lunt 60 - 127mm mod
Hi John, apologies for the slow response.
Okey dokes, if you look at the collimating lens in front of the etalon on the Lunt 60 (I think) it is 35mm diameter. So, the object of what we're trying to achieve is to position it so that it intercepts a light cone of the same diameter from the 127mm lens. We can work this out using similar triangles; i'll assume the Lunts collimator is 35mm but you should easily be able to substitute other numbers if it is not.
35/127 = 0.276
0.276 x 700mm = 193mm
So we want to position the lunt collimator 193mm inside the focus of the 127mm lens. But there is an easier way to do this - measure backwards from the back face of the 127mm lens. So, 700mm - 193mm = 507mm... This is the (approximate) gap you will need between the back of the 127mm objective and the front face of the Lunt collimating lens. You will want to have some ability to wiggle this distance a bit - it's only approximate, but it should put you somewhere in the right ball park.
Mark
Okey dokes, if you look at the collimating lens in front of the etalon on the Lunt 60 (I think) it is 35mm diameter. So, the object of what we're trying to achieve is to position it so that it intercepts a light cone of the same diameter from the 127mm lens. We can work this out using similar triangles; i'll assume the Lunts collimator is 35mm but you should easily be able to substitute other numbers if it is not.
35/127 = 0.276
0.276 x 700mm = 193mm
So we want to position the lunt collimator 193mm inside the focus of the 127mm lens. But there is an easier way to do this - measure backwards from the back face of the 127mm lens. So, 700mm - 193mm = 507mm... This is the (approximate) gap you will need between the back of the 127mm objective and the front face of the Lunt collimating lens. You will want to have some ability to wiggle this distance a bit - it's only approximate, but it should put you somewhere in the right ball park.
Mark
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Re: Lunt 60 - 127mm mod
Yup, 40mm looks like it would work. Just don't unscrew any of those retaining rings, I guess they hold the pressure on the etalon...
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Re: Lunt 60 - 127mm mod
Hi John
yes that silicone rubber compound was here too on the threads of the CaK wedge ;-)
yes that silicone rubber compound was here too on the threads of the CaK wedge ;-)
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
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Re: Lunt 60 - 127mm mod
Hi John
such is life
such is life
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
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Re: Lunt 60 - 127mm mod
Hi John
Looks great, do I know the lens , looking forward to your first lights
Looks great, do I know the lens , looking forward to your first lights
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
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Re: Lunt 60 - 127mm mod
Looks good there John! I look forward to first light
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Re: Lunt 60 - 127mm mod
Looking good, John. All primed and ready.......
Good luck with your first light.
Stu.
Good luck with your first light.
Stu.
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Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: Lunt 60 - 127mm mod
Hi John
fantastic. eager to see the first lights
fantastic. eager to see the first lights
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
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Re: Lunt 60 - 127mm mod
Have you got the ERF the wrong way round? One side has the UV/IR coating on, one side does not. Try reversing it and see what happens...
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Re: Lunt 60 - 127mm mod
John,
My internal 90mm ERF reflects back through the 150mm objective roughly mid-way between the centre and the edge. Initially I had it tilted too much in my opinion and the reflected heat was impinging on the inside face of the OTA at the rim of the objective. I reduced the tilt purposely to 'let the heat out' as it were.
Clearly, it goes without saying, care has to be taken with the now focussed reflected beam!
I don't know if this will help, but I always have a polarising filter fitted to the nose of my camera so that I can rotate to kill any reflections. My new mod doesn't seem so affected as the original version, but I've left the polariser in place anyhow.
Stu.
My internal 90mm ERF reflects back through the 150mm objective roughly mid-way between the centre and the edge. Initially I had it tilted too much in my opinion and the reflected heat was impinging on the inside face of the OTA at the rim of the objective. I reduced the tilt purposely to 'let the heat out' as it were.
Clearly, it goes without saying, care has to be taken with the now focussed reflected beam!
I don't know if this will help, but I always have a polarising filter fitted to the nose of my camera so that I can rotate to kill any reflections. My new mod doesn't seem so affected as the original version, but I've left the polariser in place anyhow.
Stu.
H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: Lunt 60 - 127mm mod
It's the relative distance of that internal ERF compared to everything else then - just gotta play around with it...
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Re: Lunt 60 - 127mm mod
Quite possibly, wouldn't surprise me.Asimov wrote:What about the fact that it's running 2 internal ERF's Mark? Reckon the 2 are interacting somehow?
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Re: Lunt 60 - 127mm mod
Noooo, definitely don't start taking anything off the 60...
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Re: Lunt 60 - 127mm mod
Hi John...
The modded system looks good...hope you have a successful first light!
Brian
The modded system looks good...hope you have a successful first light!
Brian
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10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM