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qianniu
sage
Reged: 05/05/07
Posts: 470
Loc: Columbus, OH
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Hello there,
Haven’t been on CN for a long time, kinda feeling strange while typing here… 
I am thinking to upgrade the focuser on my homemade 12” Dob. I did a little research and learned that the Zhumell 2” Craford Dual Speed Focuser is a good “bang for the buck”, though unfortunately it is nowhere to find in the market. But before keeping my fingers crossed waiting, I want to know if it will my Dob well. If it is not a good fit then I should go after alternatives.
So proud owners of this focuser please help me. What is its racked-in height, with and without the 1.25” adapter? What is its travel distance. And finally, what was it sold at while still in the market?
Thanks and happy observing.
Qianniu
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Why do the stars in the sky appear as crowded as people on the earth? Why do people on the earth appear as alienated as stars in the sky? - Lyrics of a Chinese song.
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Cames
member
Reged: 08/04/08
Posts: 49
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Please check this site for details you requested and availability. ScopeStuff
I have found the one that came with my telescope to be very nice to use.
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C
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DavidinFL
member
Reged: 08/28/09
Posts: 52
Loc: Navarre, FL
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I have the version of that focuser for a 8" scope. My guess is all that changes is the curve on the base of the focuser.
From the scope surface to the top of the focuser without the adapter is (in inches):
Min: 2 7/8 Max: 4 9/16
With Adapter:
Min: 3 1/4 Max: 4 9/16
It's a nice upgrade over a R&P focuser.
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Orion XT8 - Orion StarMax 102 EQ
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qianniu
sage
Reged: 05/05/07
Posts: 470
Loc: Columbus, OH
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Thank you very much David. That really helps! It is probably a little too high for my Dob, which needs a low profile focuser with racked-in height somewhere between 2"-2.5". I can probably push the collimation screws on the primary mirror cell to compensate for that. But then the questions is where can I get one 
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Why do the stars in the sky appear as crowded as people on the earth? Why do people on the earth appear as alienated as stars in the sky? - Lyrics of a Chinese song.
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DavidinFL
member
Reged: 08/28/09
Posts: 52
Loc: Navarre, FL
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Check the ScopeStuff link that Cames posted. They sell them there. They even have a low profile one that might be what you need.
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Orion XT8 - Orion StarMax 102 EQ
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sailor70623
scholastic sledgehammer
Reged: 01/12/08
Posts: 944
Loc: Ok.
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The Zhumell scopes use a GSO crayford focuser. These are available on e-bay, or you may get lucky and find a used one here or at astromart. The Zhumells and meade light bridges use the same focusers, but only the deluxe model LB have the 2 speed focuser. As for scope stuff I believe they carry these in both the regular height and the low profile. What it sounds like you are looking for is the GSO 2" low profile Crayford focuser.
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Corornado PST
LB 16" & 12"
Z 10"
LX50 8"
8" CPC
ETX127
102&90mm MAKs
80mm Richfield APO
70mm refractor
ETX60
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sailor70623
scholastic sledgehammer
Reged: 01/12/08
Posts: 944
Loc: Ok.
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FNL2 $139 at Scope Stuff.
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Corornado PST
LB 16" & 12"
Z 10"
LX50 8"
8" CPC
ETX127
102&90mm MAKs
80mm Richfield APO
70mm refractor
ETX60
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qianniu
sage
Reged: 05/05/07
Posts: 470
Loc: Columbus, OH
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Thanks all for the information! I got all my questions answered.
I think I'll hang around looking for a used one. If no luck by the time spring comes I'll get a new one.
qianniu
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Why do the stars in the sky appear as crowded as people on the earth? Why do people on the earth appear as alienated as stars in the sky? - Lyrics of a Chinese song.
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