RC Collimation

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DkN
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RC Collimation

Post by DkN » Fri Jul 20, 2018 11:15 am

Has anyone gotten their RC perfectly collimated. And what technique did you use? Trying to nail pinpoint stars and I think I have some more fine tuning to do. A plate solved image reports a focal length of 1354. Specs say this is supposed to be 1370. I think this means that in order to get the minimum fwhm I'll need to adjust the mirror spacing by 1.6 mm (I read every 1mm of spacing adds 10mm to FL.)
Jeff

SV80ST w/ Moonlite CFL
GSO6RC w/ Moonlite CSL
ATIK 460EX mono Starlight Xpress Lodestar SX OAG & FW
Astronomik LRGB +Ha 12nm OIII 12nm SII 12nm IDAS LPS P2
SGP, EQMOD, PI, PS
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Re: RC Collimation

Post by gardenfish » Fri Jul 20, 2018 2:44 pm

Interesting.I keep reading this and it makes me wonder. Where does platesolve figure fl from? If the camera is moved in or out would that change fl? From the focus point would a different filter say a lum and an OIII which would have a different focus point change the fl from a platesolve? I do not have my RC any more so I can not check. When I did have it I used the Howie Glatter 2" colllimator to get it as close as I could. On 25 min subs I thought I had perfect stars and only other adjustment I made for perfect stars was the ff spacing.

Chris seems like he has the RC down pretty good. Maybe a pm or maybe he will see your post and chime in. Zach is using the RC right now, just posted a pic today, maybe he has more insight.

Let us know what you find. I am going to look up focal length on my next plate slove to see what it says. All Refractors though.
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CEM60 out side pier

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h2opolo
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Re: RC Collimation

Post by h2opolo » Fri Jul 20, 2018 5:48 pm

I'm testing mine now. I used the howie glatter to get the collimation ring centered.

Chris showed me how to use a dentists mouth mirror to stick in there and make sure the laser was hitting the center of that ring on the back mirror. I bought a plastic one and bent it so I could angle it behind the secondary and see that circle on the primary.

Then I just used one of those little collimation eyepieces that you get with the Newtonian scopes. It's the one that has the little tiny hole in the center, and put it in a centering eyepiece to adjust the secondary mirror.

After that I took it out and guided on Vega to keep it in the center of the FOV. I then turned the bullseye on in SG Pro with the crosshairs and defocused Vega until you could clearly see the concentric rings. I used the outer circle of the bullseye as a reference to show me where I was leaning towards. In other words I defocused until the outer concentric circles were the same size as the large circle in the middle of the SGP bullseye.

In my case the concentric circles were a little down to the right. I then adjusted the primary mirror until the concentric circles lined up perfectly with that big circle going around the bullseye.

Now I'm testing it. Seems to be good.

Hope this made sense.

Sean
Carbon ED 127 FCD 100 SERIES, GSO RC-8, Stellarvue 130 EDT, WO GT71 & Zenith Star 61
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DkN
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Re: RC Collimation

Post by DkN » Sat Jul 21, 2018 4:42 am

Let me know what your plate solved FL is, curious.
Jeff

SV80ST w/ Moonlite CFL
GSO6RC w/ Moonlite CSL
ATIK 460EX mono Starlight Xpress Lodestar SX OAG & FW
Astronomik LRGB +Ha 12nm OIII 12nm SII 12nm IDAS LPS P2
SGP, EQMOD, PI, PS
Boxes of DIY
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h2opolo
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Re: RC Collimation

Post by h2opolo » Sat Jul 21, 2018 8:14 am

I'm using SG Pro and when I plate solve the only information it gives me is the angle and scale which is 0.59

If I look in PHD the FL is 1299

If I go into the telescope tab under the control panel in SG Pro it shows my FL as 1088

I don't have any problem plate solving. It does it in seconds.

I could mail you my Howie Glatter if you want to borrow it for a while?
Carbon ED 127 FCD 100 SERIES, GSO RC-8, Stellarvue 130 EDT, WO GT71 & Zenith Star 61
Losmandy G11G
NEQ6, ST80, Lodestar X2,
QSI 690 & 683
Astrodon Ha, SII, OII, LRGB
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DkN
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Re: RC Collimation

Post by DkN » Sat Jul 21, 2018 1:12 pm

In PI I ran ImageSolver and got this as a result.
Attachments
2018-07-21.png
Jeff

SV80ST w/ Moonlite CFL
GSO6RC w/ Moonlite CSL
ATIK 460EX mono Starlight Xpress Lodestar SX OAG & FW
Astronomik LRGB +Ha 12nm OIII 12nm SII 12nm IDAS LPS P2
SGP, EQMOD, PI, PS
Boxes of DIY
Image

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DkN
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Re: RC Collimation

Post by DkN » Sat Jul 21, 2018 1:17 pm

And Ya I'd like to give a Glatter a try. I would really appreciate that. I got a cheshire. And I did the many hour star test, inside outside focus, on axis and in all 4 corners. But I still got something going on. I am not using a flattener, reducer, or corrector of any type. I can always add the SFF6 Stellarvue flattener but was trying to tune this up optically in it own right. Was also considering getting the AP CCDT67 reducer.
Jeff

SV80ST w/ Moonlite CFL
GSO6RC w/ Moonlite CSL
ATIK 460EX mono Starlight Xpress Lodestar SX OAG & FW
Astronomik LRGB +Ha 12nm OIII 12nm SII 12nm IDAS LPS P2
SGP, EQMOD, PI, PS
Boxes of DIY
Image

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h2opolo
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Re: RC Collimation

Post by h2opolo » Sat Jul 21, 2018 2:07 pm

No problem, just shoot me a private message and send me your address again and I'll send it to you. I had the ccd677 reducer but could not get my lodestar to come into focus with the Atik camera I was using. I'm using a stellarvue recducer just like Chris has and the lodestar is on the QSI 690 and works fine. I never did get that lodestar to work with my Atik Cameras. I even had a 7mm spacer made for it and it still did not come into focus. Well it came into focus but it was not parfocal with the camera.

Ive never used plate solving in PI. Where do I find it and I'll solve an image and send you the results.
Carbon ED 127 FCD 100 SERIES, GSO RC-8, Stellarvue 130 EDT, WO GT71 & Zenith Star 61
Losmandy G11G
NEQ6, ST80, Lodestar X2,
QSI 690 & 683
Astrodon Ha, SII, OII, LRGB
Shoe size 11.5

Website http://www.redstickastro.com

gardenfish
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Re: RC Collimation

Post by gardenfish » Sun Jul 22, 2018 3:00 pm

Boy that Howie Glatter is getting around!
ES127CF FCD100
CEM60EC on PierTech 2 in Roll-off observatory

Takahashi TOA150
CEM60 out side pier

SV70T

QSI6120WSG-8
Astrodon LRGB
3nm Ha-OIII-SII

ST80 - AT60MM Guide scopes
G3 mono - ASI290MM Mini Guide camera's

Nikon D5200 Full Mod

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h2opolo
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Re: RC Collimation

Post by h2opolo » Sun Jul 22, 2018 8:08 pm

Yeah I thought about saying something. That's funny. It was yours, then travelled to Louisiana and now heading east.

That's okay, we are supposed to help each other out.

I finally have data on two targets. I spent all day shooting my dark library. I have the Omega and NGC7832 coming halls way.

You know rick, you could have at least given me the dark library when I bought your camera. Lol

I'll post tomorrow
Carbon ED 127 FCD 100 SERIES, GSO RC-8, Stellarvue 130 EDT, WO GT71 & Zenith Star 61
Losmandy G11G
NEQ6, ST80, Lodestar X2,
QSI 690 & 683
Astrodon Ha, SII, OII, LRGB
Shoe size 11.5

Website http://www.redstickastro.com

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DkN
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Re: RC Collimation

Post by DkN » Mon Jul 23, 2018 12:29 pm

You couldn't get the Ccdt67 to focus? Can you tell me about that. I was looking to get one.
Jeff

SV80ST w/ Moonlite CFL
GSO6RC w/ Moonlite CSL
ATIK 460EX mono Starlight Xpress Lodestar SX OAG & FW
Astronomik LRGB +Ha 12nm OIII 12nm SII 12nm IDAS LPS P2
SGP, EQMOD, PI, PS
Boxes of DIY
Image

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h2opolo
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Re: RC Collimation

Post by h2opolo » Tue Jul 24, 2018 1:09 pm

No my problem was I couldn't get the camera and the lodestar to focus at the same point. Parfocal.

The back spacing for my ATIK was as such that no matter what I did the lodestar would not come into focus unless I racked out the focused thus throwing the cameras focus off. I even had a guy make a handmade 7mm spacer to go in between the camera and it's mounting ring to try and correct for it but it was close but not good enough. I gave up and sold the camera and bought the QSI.

The ccd67 worked fine
Carbon ED 127 FCD 100 SERIES, GSO RC-8, Stellarvue 130 EDT, WO GT71 & Zenith Star 61
Losmandy G11G
NEQ6, ST80, Lodestar X2,
QSI 690 & 683
Astrodon Ha, SII, OII, LRGB
Shoe size 11.5

Website http://www.redstickastro.com

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