SM60 -PST Mod double stack on ED80
- Merlin66
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SM60 -PST Mod double stack on ED80
As you may know I use an SM60 etalon on an ED80 for solar observing.
I also use a PST Mod on a 102/1100 Telescope Service (Kunming) refractor.
I have made adaptors to allow the SM60 to be mounted on the 102mm and it gives great double stacked performance, but with a limited FOV due to the long focal length.
Looking at the OTA of the ED80 I found by removing the focuser and replacing it with an adaptor plate (identical to the one on the rear of the 102) I could add the PST mod to the ED80 - this should, with the 600mm fl give double stack full disk observing.
The adaptor (thanks to Les!) is about to be fitted - probably early next week due the the long weekend and family commitments....
This will give the necessary f10 for the PST mod;with a SM60 front etalon on the ED80.
Keep you posted.
I also use a PST Mod on a 102/1100 Telescope Service (Kunming) refractor.
I have made adaptors to allow the SM60 to be mounted on the 102mm and it gives great double stacked performance, but with a limited FOV due to the long focal length.
Looking at the OTA of the ED80 I found by removing the focuser and replacing it with an adaptor plate (identical to the one on the rear of the 102) I could add the PST mod to the ED80 - this should, with the 600mm fl give double stack full disk observing.
The adaptor (thanks to Les!) is about to be fitted - probably early next week due the the long weekend and family commitments....
This will give the necessary f10 for the PST mod;with a SM60 front etalon on the ED80.
Keep you posted.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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- marktownley
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Re: SM60 -PST Mod double stack on ED80
Sounds good, keep us updated.
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Re: SM60 -PST Mod double stack on ED80
OK
First light this morning with the SM60+PST Mod double stack on the ED80.
Majic!
It seems to work well - small filaprom, active area and impressive Proms easily visible.
The surface detail is as expected with a DS. So far I'm impressed - good full disks views with 15mm TV.
Just waiting on the return of my "hot" MSI computer - another SSD drive failure!!! -should be here Monday, then can try the ASI 174.
Stay tuned.
First light this morning with the SM60+PST Mod double stack on the ED80.
Majic!
It seems to work well - small filaprom, active area and impressive Proms easily visible.
The surface detail is as expected with a DS. So far I'm impressed - good full disks views with 15mm TV.
Just waiting on the return of my "hot" MSI computer - another SSD drive failure!!! -should be here Monday, then can try the ASI 174.
Stay tuned.
"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
- marktownley
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Re: SM60 -PST Mod double stack on ED80
Lovely setup Ken!
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- MapleRidge
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Re: SM60 -PST Mod double stack on ED80
Hi Ken...
The new setup looks great, and hope to see some images from it when you get the imaging system running again.
Brian
The new setup looks great, and hope to see some images from it when you get the imaging system running again.
Brian
Brian Colville
Maple Ridge Observatory
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10'x15 Roll-off Roof Observatory
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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:
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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
- Merlin66
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Re: SM60 -PST Mod double stack on ED80
The weather and seeing has been terrible for the last few weeks.....
Finally between cloud managed to get a couple of images.
ASI 174MM full disk - FC, AS3!+registax5 As above, with the x2.5PM My solar observatory is now over ten years old and still going strong. 80l grey tub, gaffa tape hinge and fencing wire to hold lid open complimented with the dark sheet. Works very well.
Finally between cloud managed to get a couple of images.
ASI 174MM full disk - FC, AS3!+registax5 As above, with the x2.5PM My solar observatory is now over ten years old and still going strong. 80l grey tub, gaffa tape hinge and fencing wire to hold lid open complimented with the dark sheet. Works very well.
"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
- marktownley
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Re: SM60 -PST Mod double stack on ED80
Nice setup and results Ken
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Re: SM60 -PST Mod double stack on ED80
Thanks Mark, but I think I still have a long way to go.
I’m struggling a bit to get the 102/500 ST102 to work with my Baader Cool wedge and the CaK filter stack.
I’m struggling a bit to get the 102/500 ST102 to work with my Baader Cool wedge and the CaK filter stack.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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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
- marktownley
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Re: SM60 -PST Mod double stack on ED80
I would stop it down to 50mm for the CaK certainly...
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- Merlin66
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Re: SM60 -PST Mod double stack on ED80
I was hoping to use the Baader wedge +0.6ND on the 102/500 with the Omega CaK stack.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: SM60 -PST Mod double stack on ED80
what filters make up the omega cak stack?
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- Merlin66
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Re: SM60 -PST Mod double stack on ED80
"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: SM60 -PST Mod double stack on ED80
If You're down at 50mm you wont need the wedge, I use my homebrew CaK stack up to 60mm without any ERF / wedge.
(assuming they're dielectric filters)
(assuming they're dielectric filters)
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Re: SM60 -PST Mod double stack on ED80
Mark,
Yes, dielectric filters.....
OK, I'll give a 55mm reduced aperture a go....
Yes, dielectric filters.....
OK, I'll give a 55mm reduced aperture a go....
"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
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http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: SM60 -PST Mod double stack on ED80
Back to the SM60/PST mod.....
I'm seriously thinking of replacing the helical focuser I use with a Lunt 60 Crayford focuser ( a gift from a friend)
The 10:1 gives 0.13mm per revolution and if I fit the SW electronic motor belt drive arrangement I should be able to significantly improve the focusing without the manual hassle and vibration.
Need to sketch up and machine a M50 adaptor for the Lunt focuser.......
I'm seriously thinking of replacing the helical focuser I use with a Lunt 60 Crayford focuser ( a gift from a friend)
The 10:1 gives 0.13mm per revolution and if I fit the SW electronic motor belt drive arrangement I should be able to significantly improve the focusing without the manual hassle and vibration.
Need to sketch up and machine a M50 adaptor for the Lunt focuser.......
"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: SM60 -PST Mod double stack on ED80
Update:
Thanks to Les for machining a perfect adaptor plate I now have the Crayford focuser (and about to add a motor/ belt drive). I can now go from visual to imaging with the ASI 174 ( or with the x2.5 PM+tilter) without having to add/ subtract spacers etc etc.
I've also, after ten years, "upgraded" the solar observatory - the lid of the grey 80l tub is now hinged with plastic wire ties - much better than the Gaffa tape ;-)
However I now find a significant "hot spot" (seems more intrusive than previous?) in the centre of the field - on the optical axis. Doesn't vary much as the SM60/ PST are re-tuned....
I've tried adding a CPL before the PST etalon and rotating the PST etalon relative to the SM60 with no change in brightness or position.
I'm even thinking of adding a "central stop" to try to suppress it.......any other ideas?????
Thanks to Les for machining a perfect adaptor plate I now have the Crayford focuser (and about to add a motor/ belt drive). I can now go from visual to imaging with the ASI 174 ( or with the x2.5 PM+tilter) without having to add/ subtract spacers etc etc.
I've also, after ten years, "upgraded" the solar observatory - the lid of the grey 80l tub is now hinged with plastic wire ties - much better than the Gaffa tape ;-)
However I now find a significant "hot spot" (seems more intrusive than previous?) in the centre of the field - on the optical axis. Doesn't vary much as the SM60/ PST are re-tuned....
I've tried adding a CPL before the PST etalon and rotating the PST etalon relative to the SM60 with no change in brightness or position.
I'm even thinking of adding a "central stop" to try to suppress it.......any other ideas?????
"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
- marktownley
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Re: SM60 -PST Mod double stack on ED80
Sounds good Ken, that upgrade from gaffa tape to cable ties is a big one
Regards the hotspot. are you talking with or without the PM? I never got on with them and found it gave me a bright spot mid field like you describe. Others though get on with them great and have no problems.
Regards the hotspot. are you talking with or without the PM? I never got on with them and found it gave me a bright spot mid field like you describe. Others though get on with them great and have no problems.
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Re: SM60 -PST Mod double stack on ED80
Seems to be more noticeable with the base SM60 +PST mod . I see it with the PM to a lesser degree.
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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: SM60 -PST Mod double stack on ED80
It not just the sweet spot? The PST etalon was designed to (just) cover the full disk at 400mm fl, running at 600mm fl you should see it in evidence when looking at fd's.
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!