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Home > Forums > ASTRONOMY EQUIPMENT > Telescope Making > Message #836549

Re: Another Recirculation C8

Posted by Keith Lawson on 11/16/2017 3:53 PM in response to Re: Another Recirculation C8   (69 hits)
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Thanks The C8 is plug and play just like a refractor. Other than collimation and overall optical correction, I have found temperature to be a big factor in lunar/planetary performance in "cats." The aluminum components cool to ambient quickly but the aluminum cools 99 times faster than glass leaving the glass with a lot of catching up to do. The boundary layer problem and internal tube currents are eliminated with this system. If you set the scope up without turning the system on you see the usual image destroying culprits in the out of focus diffraction pattern. The instant you hit the switch they disappear.

As I have shared before: "The internal air is recirculated. The cooling system is not designed to cool the optics to ambient temperature but to keep the air within the tube of a consistent temperature (no air refraction from internal temperature patterns). Since the light has to pass through the air within the tube 3 times, a mere 1/2 degree difference can do a lot of damage to the final image when it comes to fine details on the moon and planets. With the system running all the time the optics themselves do cool to ambient temperature eventually. It's like stirring cream in your coffee. Stir enough and all the elements come to the same temperature. No outside air is introduced into the system so dust is a non-issue. The system is recirculating so no filters are ever needed. The optics stay in the same "clean" condition just as if the scope was never modified."

The pic is my re-circulation cooled C-14 with twin cooling nacelles.

Scopejunkie

Photo Attached (178KB) - Click to view

This post was modified on 12/12/2017 9:25 PM

Thread:

Subject Posted By Date/Time Hits 
Another Recirculation C8 Keith Lawson 11/13/2017 3:40 PM 113
Re: Another Recirculation C8 Keith Lawson 11/14/2017 3:18 PM 81
Re: Another Recirculation C8 Keith Lawson 11/14/2017 3:19 PM 69
Re: Another Recirculation C8 Keith Lawson 11/14/2017 3:21 PM 69
Re: Another Recirculation C8 Keith Lawson 11/14/2017 3:22 PM 59
Re: Another Recirculation C8 Keith Lawson 11/14/2017 3:27 PM 68
Re: Another Recirculation C8 John Biretta 11/15/2017 11:59 PM 54
Re: Another Recirculation C8 Keith Lawson 11/16/2017 3:53 PM 69

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