SM2 to SM3 stacking question answered
- Merlin66
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Re: SM2 to SM3 stacking question answered
James,
Using the SM60II etalon adds a new dimension to the tuning of the DS.
The original SM60 etalons were both null tuned to the red wing, is meant that once they were tuned together they effectively became a “solid” narrow band filter. Any tilt tuning of the pair seemed to maintain the CWL of each etalon and allow you to go from the red wing to the blue wing.
With the SM60II the Rich View tuning moves the CWL towards the red wing, while the the tilt moves towards the blue.
I found I had to Rich View tune the SM60II to the red wing ( to better match the SM60). Then any tilt of the pair was close to maintaining the CWL at a narrower bandwidth.
I do find in use that there is a need to tweak the front SM60 to ensure they are both on band.
To help me do this I’ve added a small motor to the Tmax tuner (thanks to Martin S. For the concept) which so far seems to be working for me. (Photos to follow)
Hope this helps.
Using the SM60II etalon adds a new dimension to the tuning of the DS.
The original SM60 etalons were both null tuned to the red wing, is meant that once they were tuned together they effectively became a “solid” narrow band filter. Any tilt tuning of the pair seemed to maintain the CWL of each etalon and allow you to go from the red wing to the blue wing.
With the SM60II the Rich View tuning moves the CWL towards the red wing, while the the tilt moves towards the blue.
I found I had to Rich View tune the SM60II to the red wing ( to better match the SM60). Then any tilt of the pair was close to maintaining the CWL at a narrower bandwidth.
I do find in use that there is a need to tweak the front SM60 to ensure they are both on band.
To help me do this I’ve added a small motor to the Tmax tuner (thanks to Martin S. For the concept) which so far seems to be working for me. (Photos to follow)
Hope this helps.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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- DeepSolar64
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Re: SM2 to SM3 stacking question answered
Merlin,
Your use of motors for tuning is a wonderful idea! How actually do you control those motors? That little black box looks like a wired remote.
James
Your use of motors for tuning is a wonderful idea! How actually do you control those motors? That little black box looks like a wired remote.
James
Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
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Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
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Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
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- Merlin66
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Re: SM2 to SM3 stacking question answered
KISS......
I make use of the Skywatcher/Orion electronic motors and controllers. Cheap and effective. Use them belt geared for all the focusers (six at the last count!)
The nominal 9V SW controller also drives the micromotor (variable speed).
https://www.ebay.com.au/itm/DC-6V-12V-5 ... 2176783025
For Ha imaging I have three controllers sitting on the desk:
Fine focusing ("In/ out") - SW motor+ belt drive
Tuning of the SM6 II ("Open/Close") -SW motor+Vegemite lid
Tuning of the SM60 ("Open/Close") -micromotor+SW controller
I set and don't touch the Rich View Tuning on the SM60II
Hope that helps.
I make use of the Skywatcher/Orion electronic motors and controllers. Cheap and effective. Use them belt geared for all the focusers (six at the last count!)
The nominal 9V SW controller also drives the micromotor (variable speed).
https://www.ebay.com.au/itm/DC-6V-12V-5 ... 2176783025
For Ha imaging I have three controllers sitting on the desk:
Fine focusing ("In/ out") - SW motor+ belt drive
Tuning of the SM6 II ("Open/Close") -SW motor+Vegemite lid
Tuning of the SM60 ("Open/Close") -micromotor+SW controller
I set and don't touch the Rich View Tuning on the SM60II
Hope that helps.
"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: SM2 to SM3 stacking question answered
Ingenious.
I struggle to reach the DS tuning control on my Ha scope.
I struggle to reach the DS tuning control on my Ha scope.
Solarscope SF70DS + TV85
TSA-120, Baader wedge
TSA-120, Baader wedge
- DeepSolar64
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Re: SM2 to SM3 stacking question answered
It's the same with my SMII90. Tweak and look and tweak again. I can reach only the tuning knob on the rear etalon while looking through the eyepiece. The SMII60 is much shorter so I can look through the eyepiece as I am adjusting the tuning.Highbury Mark wrote: ↑Fri Jan 01, 2021 2:37 pm Ingenious.
I struggle to reach the DS tuning control on my Ha scope.
James
Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
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- Merlin66
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Re: SM2 to SM3 stacking question answered
James,
Sounds like you need to buy some Vegemite!
I've used the Vegemite lid drive for over ten years....well worth trying. Certainly makes life much easier.....
Sounds like you need to buy some Vegemite!
I've used the Vegemite lid drive for over ten years....well worth trying. Certainly makes life much easier.....
"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: SM2 to SM3 stacking question answered
Vegemite! Yes, I need to try that. I hear it's an acquired taste though. Here it's called Marmite.
And make a motorized drive using the lid for the 90.
James
And make a motorized drive using the lid for the 90.
James
Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
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- Merlin66
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Re: SM2 to SM3 stacking question answered
James,
The Pommie Marmite is a poor copy of our Vegemite
You'll find fitting a drive well worth the effort.
The Pommie Marmite is a poor copy of our Vegemite
You'll find fitting a drive well worth the effort.
"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
- DeepSolar64
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Re: SM2 to SM3 stacking question answered
Merlin,
Whole Foods has Vegemite locally and it can also be ordered on Amazon. Our local Ingle's store has Marmite. I'll have to try a Vegemite sandwich! And save the yellow lid!
I had to look the stuff up. It's not exactly a common spread here.
https://www.amazon.com/s/ref=nb_sb_noss ... s=Vegemite
I think the subject of Marmite came up with Alexandra some time back. If I remember right, she likes the stuff. Now I gotta try it. I know to expect something different.
James
Whole Foods has Vegemite locally and it can also be ordered on Amazon. Our local Ingle's store has Marmite. I'll have to try a Vegemite sandwich! And save the yellow lid!
I had to look the stuff up. It's not exactly a common spread here.
https://www.amazon.com/s/ref=nb_sb_noss ... s=Vegemite
I think the subject of Marmite came up with Alexandra some time back. If I remember right, she likes the stuff. Now I gotta try it. I know to expect something different.
James
Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "
- marktownley
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Re: SM2 to SM3 stacking question answered
Vegemite on toast with butter is my favourite, I also like Marmite. A spoonful in a winter stew works well too.
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- Merlin66
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Re: SM2 to SM3 stacking question answered
I may be Scots by birth, I’m Australian by choice.
"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
- DeepSolar64
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Re: SM2 to SM3 stacking question answered
Colin Hay of the 80’s rock band said the same thing. He was also born in Scotland but moved early in life to Australia. He loves the land “ down under “!!
Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "