coopman
Carpal Tunnel
Reged: 04/23/06
Posts: 2892
Loc: South Louisiana
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Is one supposedly better than the other for some reason?
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Regards,
Clay
"The heavens declare the glory of God; the skies proclaim the work of his hands." Psalms 19:1
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David Pavlich
Transmographied
Reged: 05/18/05
Posts: 21117
Loc: Mandeville, LA USA
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Carbon fibre tubes are more stable during temperature fluxuations which makes them more desireable for serious imaging. The negative side of CF is that it's a lousy heat sync. In other words, it takes longer to cool down than an aluminum tube.
David
Edited by David Pavlich (12/24/07 05:15 PM)
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Eddgie
Postmaster
Reged: 02/01/06
Posts: 7951
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Yes,the Carbon Fibre tubes don't expand lengthwise. As the metal expands, the length of the tube changes. If you are doing imageing, the very slight change in length changes ther focal length, which of course changes the focus.
It is a bit lighter too, but I don't think that this is enough to matter.
I think if you were taking long exposure pics, it might make a difference. Don't know.
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Celestron CGE 1400
Astro-Physics 6" f/8
Celestron EdgeHD C8
Antik AR1/Revenge Plates/Heartless Voodoos
The night sky is my mistress. She seduces me away from all other lovers.
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HendyPhoto
Sith Lord
Reged: 08/09/06
Posts: 1502
Loc: Bountiful, Utah
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CF looks cool!
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~jon
SparkCast
CGE1400XLT w/HyperStar
90FD 66SD C6-R SN-8
CPC1100XLT Hutech 20D
Manny-Mod Vixen Porta
Mallincam MCHP
SPC900NC
CG-5 GT
"Two things are infinite: the universe and human stupidity;
and I'm not sure about the universe." --Albert Einstein
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firestar
Born to be Mild
Reged: 10/18/06
Posts: 3942
Loc: Cleveland Ohio USA
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Quote:
CF looks cool!
 
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Eastlake Ohio
Lots of cheap Asian glass  
Antares 12" Dob,Antares 8" Dob
Meade 8" SCT, Celestron C8 SCT
Zhumell 152 mm F8,Antares 127 mm f9.4
Orion short tube 90 F5.6,Celestron 80 ED F7.5
Imaging Source DMK 21AU04 ccd camera
Stellarvue bv3's with 32,26,23,21,9 mm pairs
Olivon 42,35,28mm,siebert 21,12.5,7mm,GSO superview 20mm,Meade swa 13.8mm,Hyperion 13mm
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Doug
sage
Reged: 05/08/03
Posts: 299
Loc: Northern New Jersey
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I noticed that Celestron discontinued the CF 9.25" OTA. http://www.optcorp.com/product.aspx?pid=3554
Doug
Celestron CG-14
Celestron C6-R
TV102 / TV76
SolarMax 60 / BF-30
Losmandy G11
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HendyPhoto
Sith Lord
Reged: 08/09/06
Posts: 1502
Loc: Bountiful, Utah
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I think they discontinued everything with the standard coatings. You can still get the CF with XLT though, which is what you would want anyway!
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~jon
SparkCast
CGE1400XLT w/HyperStar
90FD 66SD C6-R SN-8
CPC1100XLT Hutech 20D
Manny-Mod Vixen Porta
Mallincam MCHP
SPC900NC
CG-5 GT
"Two things are infinite: the universe and human stupidity;
and I'm not sure about the universe." --Albert Einstein
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Randy Roy
sage
Reged: 10/07/05
Posts: 443
Loc: Tennessee
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There is no advantage of carbon fiber over aluminum for visual use. For visual use, aluminum has the small advantage of slightly faster cool-down times. CF has no advantage for video, DSLR or planetary imaging. It has a decided advantage in long exposure imaging in that less focusing is required as temps change over long periods.
I think CF looks cool, too, but that is a matter of personal preference. I don't care as much for the CF look on refractors, though.
Randy Roy
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scopedude
scholastic sledgehammer
Reged: 06/26/06
Posts: 831
Loc: 6 deg. South
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Quote:
I think they discontinued everything with the standard coatings. You can still get the CF with XLT though, which is what you would want anyway!
Celestron will discontinue all the CF tube in 2008 - get it while you can.
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Megrez 80 FD, Megrez 88, FLT-98, ZS110 APO
Vixen R150S, Vixen NA140SSf
Celestron C8 CF, C5 Spotter
WO 7x50
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davidpitre
Post Laureate
Reged: 05/10/05
Posts: 3183
Loc: Central Texas
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In my experience with side by side tests, carbon fiber can take considerably longer to cool down, and can have a difficult time chasing temperature changes during the night.
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David
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ronruiz44
sage
Reged: 08/29/07
Posts: 289
Loc: West Texas
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Quote:
Is one supposedly better than the other for some reason?
CF is also stronger (generally that is)!
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Ron
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scopedude
scholastic sledgehammer
Reged: 06/26/06
Posts: 831
Loc: 6 deg. South
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Quote:
In my experience with side by side tests, carbon fiber can take considerably longer to cool down, and can have a difficult time chasing temperature changes during the night.
Not in tropical area 
Here, in daylight the temp is around 33-34C, drops to 26-28C at night. Inside the house, we keep the temp around 25-26C, so when I take it outside, there is practically no temp difference. Any SCTs can be a grab and go.
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Megrez 80 FD, Megrez 88, FLT-98, ZS110 APO
Vixen R150S, Vixen NA140SSf
Celestron C8 CF, C5 Spotter
WO 7x50
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pollux
artiste
Reged: 04/01/04
Posts: 7307
Loc: Burnaby Canada
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I heard someone saying all Celestron's SCT with carbon fiber tube have just started to be discontinued
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My Web Site
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scopedude
scholastic sledgehammer
Reged: 06/26/06
Posts: 831
Loc: 6 deg. South
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Yep, due to long and limited supply. I see a C11 in your future though. It's not clear whether it's CF or not 
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Megrez 80 FD, Megrez 88, FLT-98, ZS110 APO
Vixen R150S, Vixen NA140SSf
Celestron C8 CF, C5 Spotter
WO 7x50
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JerryWise
Postmaster
Reged: 12/26/03
Posts: 9284
Loc: Lexington, SC
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If you really want CF you can upgrade with an aftermarket tube. Puts you on a first name basis with the inside of your Celestron.
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HendyPhoto
Sith Lord
Reged: 08/09/06
Posts: 1502
Loc: Bountiful, Utah
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I should buy some carbon fiber OTA's before they are all discontinued, and sell them when they are extinct for more!
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~jon
SparkCast
CGE1400XLT w/HyperStar
90FD 66SD C6-R SN-8
CPC1100XLT Hutech 20D
Manny-Mod Vixen Porta
Mallincam MCHP
SPC900NC
CG-5 GT
"Two things are infinite: the universe and human stupidity;
and I'm not sure about the universe." --Albert Einstein
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pollux
artiste
Reged: 04/01/04
Posts: 7307
Loc: Burnaby Canada
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I too think CF is way cooler to look at than the aluminum.
But practically I really don't know.....
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My Web Site
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