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AT8RC

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gardenfish

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Post Sun Dec 18, 2016 8:05 pm

AT8RC

Here is the first shot with AT8RC, Atik and 2"ff. 9-300s Ha.


at8rc.jpg
at8rc.jpg (102.16 KiB) Viewed 6706 times
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Doug

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Post Mon Dec 19, 2016 4:21 am

Re: AT8RC

Any specific target you were shooting?

Looks decent. Stars look a little soft, but, the longer focal length may contribute to the softer stars.
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gardenfish

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Post Mon Dec 19, 2016 5:00 am

Re: AT8RC

Just shooting stars in Cassiopia area to see how it would track without the TOAG.
Takahashi TSA120
Takahashi TOA150
SV70T
CEM60 - PierTech2 pier
QSI6120 WSG-8
Astrodon 31mm LRGB E Series -Ha-3nm - OIII-3nm - SII-3nm

G3 Mono - ASI290MM Mini - ST80

ES 152 AR - Atlas mount
16" goto Dob

Nikon D5200 Modded

Roll-off roof Observatory
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Doug

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Post Mon Dec 19, 2016 7:58 am

Re: AT8RC

No guiding at all? Wow! That's really great results! :thumbup: :thumbup:
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gardenfish

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Post Mon Dec 19, 2016 11:54 am

Re: AT8RC

Ha Ha! If I had a mount that could do that I'd be dangerous :9: . I tried out a $1300 guide scope :what: . Well anyway I mounted the Orion ED80T CF on top of the AT8RC and used the Orion G3 MONO as the guide camera. It seemed to work pretty good. I got the spacing on the Atik camera to 58.5mm for the 2" ff. I am going to try it again for 15 and 20 mins and see how it goes, while in the meantime I try and figure out the TOAG. I cant get the spacing with the TOAG and the 2"ff but if I eliminate the FF I should be able to get the TOAG working as there will be no Back focus required.
Takahashi TSA120
Takahashi TOA150
SV70T
CEM60 - PierTech2 pier
QSI6120 WSG-8
Astrodon 31mm LRGB E Series -Ha-3nm - OIII-3nm - SII-3nm

G3 Mono - ASI290MM Mini - ST80

ES 152 AR - Atlas mount
16" goto Dob

Nikon D5200 Modded

Roll-off roof Observatory
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Doug

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The good thing about science is that it’s true whether or not you believe in it. ― Neil deGrasse Tyson

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Post Mon Dec 19, 2016 1:37 pm

Re: AT8RC

Looks good. But you can get away with a 100.00 guide scope too. But, if you had the triplet hanging around that's a good use of it.

BTW, your triplet is f/6 and your rc is f/8...unless you reduced it.... Anyway, the point I'm making is I've always had great success with guiding at f/11. If you have a 2x Barlow hanging around put that on your f/6 and make it f/12.

Ive noticed the difference when I was trying a low F speed guide scope. Better results I've seen using higher F speed guide scopes.
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gardenfish

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Post Mon Dec 19, 2016 2:46 pm

Re: AT8RC

I have a barlow I can try. I do not plan on using the 80mm triplett as my guide scope but I have the ST80 set up as the guidescope on the 127 and did not want to move it. With the 1600 focal length of the RC I wanted to see if an 80mm would guide it ok. I have researched a lot on it and some say they have great success using an outside guider and others cannot guide without an OAG.

So who do you believe? So I figured try it myself and see. The 80 triplett has a 480 focal length and the ST80 has a 400mm focal length. Don't know if that will matter but maybe with the 2x barlow it will help. I also could try a 3x. Maybe more magnification will balance the focal length difference. It sure would make it easier for me using the 2" FF in the imaging train if I used outside guiding.
Takahashi TSA120
Takahashi TOA150
SV70T
CEM60 - PierTech2 pier
QSI6120 WSG-8
Astrodon 31mm LRGB E Series -Ha-3nm - OIII-3nm - SII-3nm

G3 Mono - ASI290MM Mini - ST80

ES 152 AR - Atlas mount
16" goto Dob

Nikon D5200 Modded

Roll-off roof Observatory
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Doug

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The good thing about science is that it’s true whether or not you believe in it. ― Neil deGrasse Tyson

Posts: 6416

Joined: Tue Dec 23, 2008 11:41 am

Location: Temecula, California

Post Mon Dec 19, 2016 4:17 pm

Re: AT8RC

You probably got a better result, not by much using the F/6 over the F/5. Definitely put your 2X barlow on your F/6 or F/5 scopes for guiding. Seems like F/11 was the sweet spot for me.

It's one of the videos I was planning to do because I purchased one of those smaller finder guide scopes....hated it! However, when I used 2X and 3X barlows...then the finder guide scope started working. My guiding was all over the place when I was at F/5.

Each setup is different I know...but, I'll never go back to short focal length guiding again.
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gardenfish

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Post Tue Dec 20, 2016 5:26 pm

Re: AT8RC

This is The Ghost in Cassiopia only 5 stacked 300s Ha. Still at 58.5mm back spacing. Still External guiding. No barlow yet. Do you think the stars appear round through out? I know its only a jpeg but to me they look pretty good.

Thanks Rick


ghost copy.jpg
ghost copy.jpg (168.45 KiB) Viewed 6672 times
Takahashi TSA120
Takahashi TOA150
SV70T
CEM60 - PierTech2 pier
QSI6120 WSG-8
Astrodon 31mm LRGB E Series -Ha-3nm - OIII-3nm - SII-3nm

G3 Mono - ASI290MM Mini - ST80

ES 152 AR - Atlas mount
16" goto Dob

Nikon D5200 Modded

Roll-off roof Observatory
<<

gardenfish

Kiloparsec

Posts: 1082

Joined: Fri Feb 05, 2016 9:18 am

Location: Phoenix Az.

Post Tue Dec 20, 2016 5:41 pm

Re: AT8RC

This is just 3 - 600s Ha. Different area, all else the same. I think there is just a little off of the roundness. I may try PEC for the first time to see if it would help.

Comments?

600s.jpg
600s.jpg (138.88 KiB) Viewed 6672 times
Takahashi TSA120
Takahashi TOA150
SV70T
CEM60 - PierTech2 pier
QSI6120 WSG-8
Astrodon 31mm LRGB E Series -Ha-3nm - OIII-3nm - SII-3nm

G3 Mono - ASI290MM Mini - ST80

ES 152 AR - Atlas mount
16" goto Dob

Nikon D5200 Modded

Roll-off roof Observatory
<<

DkN

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Giant Molecular Cloud (GMC)

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Post Tue Dec 20, 2016 7:32 pm

Re: AT8RC

Its hard to say. Jpg's really scramble up the fine details. The lower image the stars seem to have a diamond shape, but without seeing the original FITs image I can't say for sure.
Jeff

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Doug

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The good thing about science is that it’s true whether or not you believe in it. ― Neil deGrasse Tyson

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Joined: Tue Dec 23, 2008 11:41 am

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Post Tue Dec 20, 2016 8:55 pm

Re: AT8RC

Looks good. The lower center left look like the stars are pointed UP and Down, just a very little egg shaped.
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MyAstroImages.com Photo Album. Sharing Your AstroImages On Line!
More Images.
:darkgrin:
CPC800, 60MM Classic Refractor, EON72, EON120, Atlas EQ-G, SSPro V1, SSAG, IDAS LPS Filter, TRF-2008
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gardenfish

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Posts: 1082

Joined: Fri Feb 05, 2016 9:18 am

Location: Phoenix Az.

Post Wed Dec 21, 2016 4:59 am

Re: AT8RC

Jeff when I get home today I will post a link to one frame of the 300s and one frame of the 600s in original form.

Thanks
Takahashi TSA120
Takahashi TOA150
SV70T
CEM60 - PierTech2 pier
QSI6120 WSG-8
Astrodon 31mm LRGB E Series -Ha-3nm - OIII-3nm - SII-3nm

G3 Mono - ASI290MM Mini - ST80

ES 152 AR - Atlas mount
16" goto Dob

Nikon D5200 Modded

Roll-off roof Observatory
<<

gardenfish

Kiloparsec

Posts: 1082

Joined: Fri Feb 05, 2016 9:18 am

Location: Phoenix Az.

Post Wed Dec 21, 2016 4:08 pm

Re: AT8RC

Here is a link to one 300s and one 600s sub. I am going to wait since there is rain for 4 days forecasted but I think I will get CCDinspector on the trial and maybe keep it if it helps. I wanted to see the fov with the rc so thats why I did the external guiding. I am going to probably set the Atik back up on the 127mm and get some nice 20-30 min exposures of the Ghost and work on figuring out the TOAG so I can get longer exposures with the rc. I can use the QHY9 on the rc to test the TOAG and get it working.

Again thanks for all the help :jumphappy:




https://www.dropbox.com/sh/c0undmodys3y ... uS4Wa?dl=0
Takahashi TSA120
Takahashi TOA150
SV70T
CEM60 - PierTech2 pier
QSI6120 WSG-8
Astrodon 31mm LRGB E Series -Ha-3nm - OIII-3nm - SII-3nm

G3 Mono - ASI290MM Mini - ST80

ES 152 AR - Atlas mount
16" goto Dob

Nikon D5200 Modded

Roll-off roof Observatory

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