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Author Topic: Finder scope for auto guiding  (Read 1028 times)

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Offline Ian Taylor

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Finder scope for auto guiding
« on: 21:12:05, 26 January, 2016 »
Is it possible to use a 7x50 finder scope for auto guiding. Main telescope would be focal length of around 700 mm.
If so does anyone know what the rough focal length of the finder scope is.
Ian Taylor
Chester, UK
Orion Optics DX 300 f/4 + Skywatcher 80ED refractor + William Optics Megrez 102 mm f/7 refractor on Losmandy G11 mount + Atik 16ic-s + unmodified Canon EOS 7D
https://chesterastroblog.wordpress.com

Online chris.bailey

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Re: Finder scope for auto guiding
« Reply #1 on: 22:24:33, 26 January, 2016 »
Ian

You would need to strip out the eyepiece elements. Focal Ratio is commonly around f4 to f5 so you would have around 200 to 250mm of focal length. As long as you mount it solidly to minimise differential flexure it should work well enough for guiding 700mm

Chris
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Offline PaulB

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Re: Finder scope for auto guiding
« Reply #2 on: 06:21:53, 27 January, 2016 »
As Chris has said. You should not have any difficulty guiding.

But- I would suggest getting a 9x50 finder, to use instead. I use one to guide my C9.25 and don't have any issues, guiding.
You will have to remove the rear eyepiece. (All ready mentioned) And add one of these to use with your guide camera.

http://www.modernastronomy.com/product-category/accessories/adapters/



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Offline MikeDunn

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Re: Finder scope for auto guiding
« Reply #3 on: 08:53:31, 27 January, 2016 »
Related to this ... ...

Does anyone know the adapter type I would need to do the same for the standard Meade finder on the LX200s ?

Mike
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Offline Ian Taylor

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Re: Finder scope for auto guiding
« Reply #4 on: 10:32:12, 27 January, 2016 »
Thanks for the advice - in fact for the finderscope I have, the eyepiece does come out easily (just like a normal eyepiece on a telescope) and it is straightforward to fit the 1.25 inch tube of the guiding camera in. I have plenty of short tubes (from various old barlows etc) which I should be able to use to get focus, and the tube on the Atik 16ic camera is quite long anyway, so I should be able to get focus and just use a parfocalising ring. I have some short tube adapters for the camera too if a shorter one is needed. I will try it out next time its clear. ,
Ian Taylor
Chester, UK
Orion Optics DX 300 f/4 + Skywatcher 80ED refractor + William Optics Megrez 102 mm f/7 refractor on Losmandy G11 mount + Atik 16ic-s + unmodified Canon EOS 7D
https://chesterastroblog.wordpress.com

 

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