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9.25 SCT Focuser * Help *

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#1 william

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Posted 19 October 2005 - 08:11 PM

Need advice on focuser for a 9.25 SCT. I put a Feather Touch outboard foucer with 1.5" of travel on my SCT. When using the stock foucer for rough focus, should the outboard focuser be racked all of the way in or out? Is there an advantage to having this extra focuser? I haven't used it but one time, but I can't see any benefit.

William
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Burgess 127/8
Celestron 9.25 XLT
Vixen 80mm f/11.4
Oberwerk 15x60 475/501

#2 JerryWise

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Posted 19 October 2005 - 08:22 PM

Hello William. Put the FeatherTouch exactly halfway through it's travel. Dead center in the middle. Then carefully focus using the 9.25 focus knob. Then you will have 3/4 inch of fine focus in each direction. The benefit is you will not have any mirror "flop" and you can use the slow knob (x10 knob) to do a perfect final focus. Works like a champ.

#3 william

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Posted 19 October 2005 - 08:45 PM

Thanks Jerry, this can be a frustrating hobby when you don't know what you are doing. :bow:. I have it setup now, and will try it on Mars later tonight.

William
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Burgess 127/8
Celestron 9.25 XLT
Vixen 80mm f/11.4
Oberwerk 15x70 475/501

#4 JerryWise

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Posted 19 October 2005 - 10:27 PM

Let me know how Mars comes out. I have the Meade 4 inch setup on the porch right now. Looks like the Moon and Mars are almost too close. Seeing conditions look good though and I don't see the usual light dome over your way. Might be a good night.

If you don't see the detail clearly on Mars it most likely needs a deep collimation. I did my 9.25 several nights ago and it made a big difference. It looked fine collimation wise in a 20mm EP. When I did it with a 3mm it helped a lot.

#5 william

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Posted 20 October 2005 - 01:33 PM

Jerry your advice on the focuser worked great, thanks. I was disappointed with the view of the 9.25. I was using a Burgess/TMB 9mm and UO 18mm. I thought that the 9.25 would have gave a much larger image size. :confused: I had a 5" refractor set up also, and the views were not that much different. I checked the collimation of the 9.25 with a 20mm eyepiece, I will try it again with another eyepiece.

William
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Burgess 127/8
Celestron 9.25 XLT
Vixen 80mm f/11.4
Oberwerk 15x70 475/501

#6 JerryWise

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Posted 20 October 2005 - 03:02 PM

William, I was out last night with a 4" refractor and a 3-7 zoom Nagler. Also an 8.8 UWA Meade EP. Saw clouds and both polls on Mars with the Moon nearby. I see the same thing with my 9.25. I think the XLT coatings and the light collection really over saturate the images. The refractors seem to have an edge on planetary. Swing the refractor over to m31 or m13 and the difference becomes very obvious. The 9.25 is in it's element in deep sky. Looks like we will have a few clouds floating around tonight. I have a training class down behind Ben Satcher so I won't get back to the scope until around 11. Hope the clouds hold off.


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