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Lester
sage
Reged: 07/05/06
Posts: 205
Loc: South Australia
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Re: 2nd July Jupiter
07/07/08 07:26 AM Attachment (27 downloads)
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Thanks Timo.
I use a 14" LX200 OTA that I have flocked internally. I have fitted ice water cooling to the tube with 1/2" hose wrapped around about 10 revolutions. I have a 12 volt bilge pump in a large esky of water. At the beginning of a imaging night I place 3 x 2 litre blocks of ice into the water and turn on the pump. this pumps the ice water around the OTA and cools it to ambient in 1-2 hours. My coldest night temperature only gets down to 5 degrees C. This cooling method works fine for my conditions, but where the temperature gets to below 5 degrees, this system would struggle.
I have a temperature sensor fitted to the rear of the primary mirror to inform me of its temperature.
I use a DFK 21af04 camera, that I have removed the filter off of the CCD. I never use to get good images before I did that.
My scope is permanently set-up in an observatory on my farm. I built it when I was 16 and now I am 51. It has been modified a few times in that period.
Here is a image of the hose around the OTA for cooling.
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