AT6RC Carbon Fiber Tubes
Posted 17 October 2010 - 12:40 PM
I would shoot for under $200. Probably in the $175 range for standard grey/black clear-coated CF. Custom colors usually run an additional $70.
They use carbon fiber tubes for all of the other AT-RC scopes for good reason and having an open-ended OTA actually makes CF an even better choice. CF is better to use because it has an extremely low coefficient of expansion. This is critical in astrophotography applications like these scopes are intended to be used for. The metal tube will change length (and because it is not an extruded metal tube it will also change shape) as the air temperature changes. The result is first a shift in focus and second a potential shift in secondary position. Obviously, these are critical issues for any imaging, particularly long exposure imaging.
The beauty of an open-ended OTA with a CF tube is that there is less issue of temperature differential between the interior and exterior of the OTA. One reason some people don't like CF on SCT scopes is because the air inside the scope can take longer to equilibrate with the outside air because the CF does not transmit heat and readily as a metal tube does. The AT6RC is a perfect choice for a CF tube and now that they have gotten so cheap a CF tube can be added and you will probably still spend less than the scope originally cost.
I already make these retrofit tubes for the Celestron C8 and C11 scopes and they are very nice upgrades.
Posted 17 October 2010 - 01:34 PM
Posted 17 October 2010 - 03:01 PM
Posted 17 October 2010 - 03:47 PM
Not that I will get much response in the vendor forum...
Well, I'm glad you did!
Sending you a PM.
Posted 17 October 2010 - 09:27 PM
Posted 17 October 2010 - 09:36 PM
Posted 19 October 2010 - 11:11 AM
I might be interested, although having just ordered recently who knows when my scope will actually get to me!
Posted 19 October 2010 - 10:52 PM
Posted 09 December 2010 - 08:20 PM
Posted 10 December 2010 - 12:26 PM
Posted 07 February 2011 - 09:39 PM
Posted 07 March 2013 - 08:37 PM