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  #21  
Old 19-09-2018, 08:30 AM
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Merlin66 (Ken)
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I would try to get the guide camera on the OAG working in daylight.
Once set up it’s good for ever and in the end will give better results.
Persevere.......
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  #22  
Old 19-09-2018, 08:31 AM
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Joshua Bunn (Joshua)
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With basically a 4:1 ratio of imager to guider FL, that should be ok.


Josh.
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  #23  
Old 19-09-2018, 07:57 PM
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AstroBogan (Jacob)
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Ok so I need clarification..

I was able to reach focus on the guide cam tonight.

To get focus on the main imaging camera I needed to rack the focuser further in by about 10mm. Does that mean i need to add 10mm to the OAG for the guide cam to become focused at the same time or do I need to take 10mm away from the main imaging camera before the OAG?
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  #24  
Old 19-09-2018, 08:01 PM
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I think you need to either remove approx 10mm from in between the OAG and guide cam, or add 10mm in between OAG and the imaging camera.....
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  #25  
Old 19-09-2018, 08:13 PM
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Lee is correct, of course Lee's second option will depend on whether you have enough backfocus to do this.


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  #26  
Old 19-09-2018, 08:29 PM
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Quote:
Originally Posted by Joshua Bunn View Post
I think you should go back to basics.
Make sure the camera works, work out the backfocus of the scope by measuring the distance that the imager comes to focus, then get out some measuring calipers to work out where the guide camera needs to be placed.
This is still what you should do - I think you are getting there, but doing it the hard way.... remember the imaging and guide CCD planes need to be the same distance from the centre of the pick of prism. Get it close with calipers, focus imaging cam then fine tune the guide CCD distance.....
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  #27  
Old 19-09-2018, 09:17 PM
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Sounds like you're getting there Jacob, but whenever you're lost for focus it can be helpful (and morale building!) to stick an eyepiece in and check you're in the ballpark for focus. Once you know within a cm or so where your main focus and spacings have to be, it becomes a matter of tweaking.

Until you get "in the ballpark" though, there's nothing much more frustrating than tweaking focus and spacings but only see unchanging grey/static on your guide cam screen.
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