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Good after market focuser ?

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#1 gazerjim

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Posted 29 March 2005 - 04:39 AM

Can anyone suggest a good manual "after market" focuser for a 9.25 that would allow for very fine focusing adjustment without the need for an electrical power source or additional wires?

Jim

#2 sixela

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Posted 29 March 2005 - 07:56 AM

JMI and William Optics have Crayfords that thread on the SCT threads. I've only used the William Optics one. You'll find several threads in the archives discussing all the options.

As you also have a "rough" focuser moving the primary mirror, there's also the Borg helical focuser.

#3 Doug

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Posted 29 March 2005 - 08:29 AM

Hi Jim, I use a Starlight Instruments Focuser on my C14. Incredible workmanship and quality. :waytogo:

http://www.starlightinstruments.com/

Doug


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#4 conus

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Posted 29 March 2005 - 09:26 AM

Me too. I use a Feathertouch on my C9.25 and the fine focus knob makes focusing a breeze, especially when imaging planets.

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#5 Chris G

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Posted 29 March 2005 - 09:40 AM

WO focser on mine, works really well, very smooth and i love the fact it rotates.

#6 RGM

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Posted 29 March 2005 - 10:00 AM

I have the WO focuser also. It has a somewhat finer adjustment than the main SCT focuser, but not a 10:1 ratio like others. As Chris mentioned, the fact that it can be rotated without affecting collimation is a bonus.

#7 matt

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Posted 29 March 2005 - 12:38 PM

It's not as sophisticated, but Orion also makes a helical fine-focus thing, which costs about 50$ I think.

#8 gazerjim

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Posted 29 March 2005 - 10:29 PM

Thanks for all the fine suggestions. Time to go Googling.

Jim

#9 southmike

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Posted 30 March 2005 - 01:03 AM

does the rotation affect t-mounted cameras?


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