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Low Profile Focuser

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16 years 9 months ago #63720 by JohnMurphy
Low Profile Focuser was created by JohnMurphy
I recently purchased a Celestron C8N-GT, and am looking to upgrade the focuser for a more photography friendly focuser. I would be interested in hearing anybody's experiences on any suitable low profile focusers. At the moment I am removing the 1.25" adapter and attaching the Camera (350D) directly to the existing focuser using the T-Ring, however this precludes me from using any UHC or LPR filters. Be good to hear of others experiences.

Clear Skies,
John Murphy
Irish Astronomical Society
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16 years 9 months ago #63725 by dmcdona
Replied by dmcdona on topic Re: Low Profile Focuser
Dunno if its what you're looking for but the Finger Lakes PDF is top drawer:

www.flicamera.com/fli/focusers.asp?product_model=PDF

Its pricey but I have one and I can't praise it enough. Totally automated (with FocusMax - free software) and talk about fine focusing - 1.25 micron per step and there's 7000 of them. And it'll carry a huge weight - I can;t remeber what the spec is but I have about 4kg hanging off mine...

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16 years 9 months ago #63817 by JohnMurphy
Replied by JohnMurphy on topic Re: Low Profile Focuser
Thanks Dave but its well over my budget.

Clear Skies,
John Murphy
Irish Astronomical Society
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16 years 9 months ago #63856 by michaeloconnell
Replied by michaeloconnell on topic Re: Low Profile Focuser

I recently purchased a Celestron C8N-GT, and am looking to upgrade the focuser for a more photography friendly focuser. I would be interested in hearing anybody's experiences on any suitable low profile focusers. At the moment I am removing the 1.25" adapter and attaching the Camera (350D) directly to the existing focuser using the T-Ring, however this precludes me from using any UHC or LPR filters. Be good to hear of others experiences.


John,
Just to confirm, are you physically attaching the EOS T-ring to the focuser, or, are you simply inserting the T-Adapter into the focuser?
I have an EOS T-ring and a 2" T-adapter. This allows me to insert the 2" T-adapter into the focuser. The 2" adapter can then take screw-on filters. The only thing "sticking out" beyond the focuser is the EOS T-ring and the camera.
Is this of any use to you?

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16 years 9 months ago #64004 by JohnMurphy
Replied by JohnMurphy on topic Re: Low Profile Focuser
Thanks Michael (I'm attaching the T-ring to the focuser) - but what I'm really looking for is a review of a low profile focuser like a KineOptics (helical crayford) or a JMI, or a GSO 10:1 low profile (currently available on ebay for just $134) sse the link : cgi.ebay.ie/GSO-10-1-Crayford-Focuser-fo...122#ebayphotohosting . What I was really wondering is if anybody on the boards might have had any experience with any of the above and the Celestron C8N-GT. Looks like I'll have to blaze my own trail. What I'm wondering is if I'll need an extension tube to revert to visual use - that'd be a pain.

Clear Skies,
John Murphy
Irish Astronomical Society
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16 years 9 months ago #64006 by michaeloconnell
Replied by michaeloconnell on topic Re: Low Profile Focuser
Have you consodered raising the primary mirror? This would give alot more focus range and may give more options in the selection of a focuser.
Unfortunately, I don't have any experience with a low profile focuser so can't help you with that one.

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