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 Post Posted: Mon Jun 19, 2017 11:41 am 
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Joined: Fri Feb 24, 2017 10:52 am
Posts: 11
Hi, last night I shot M16 in Ha 7Nm. 5x20min TEC -20, LNR
Attachment:
M16 Ha 5x20min.jpeg
M16 Ha 5x20min.jpeg [ 84.18 KiB | Viewed 76 times ]

Sub frame #6 failed because a dew spot had developed on the window's outside.
Despite that the anti-dew option was tagged in the ASCOM driver.
What is it that this anti-dew function provides, if still dew can develop on the windows outside?
When I wiped it of it immediately fogged up again.
Atmospheric conditions were fairly humid, towards slight ground-fogg.
My telescope did not fog up with no anti-dew ribbons installed.
I just ordered your anti-dew ring to stick on the camera, hoping that this will prevent re-occurence.
I am very pleased with the result btw.
This proves that Ha is possible with this OSC camera.
Regards
Arie


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 Post Posted: Tue Jun 20, 2017 8:33 am 
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Joined: Thu Feb 21, 2013 2:51 am
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thanks for your feedback
I think we need to enhance the power of the heater which maybe not powerful enough

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 Post Posted: Tue Jun 20, 2017 1:14 pm 
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I think so too, Sam.
The outer edge of the window was clean, but a round spot of +/-2cm developed in te middle after 2 hours in operation at TEC -20.
I can imagine that the super cold sensor draws heat from the window glass sufficiently to cause it to dew-up in certain circumstances. The installed heater was not powerful enough to counteract this process. You could consider a heater in 3 steps. L-M-H
I do hope that with your additional accessory the window will become warm enough.


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 Post Posted: Thu Jun 22, 2017 2:12 am 
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arie wrote:
I think so too, Sam.
The outer edge of the window was clean, but a round spot of +/-2cm developed in te middle after 2 hours in operation at TEC -20.
I can imagine that the super cold sensor draws heat from the window glass sufficiently to cause it to dew-up in certain circumstances. The installed heater was not powerful enough to counteract this process. You could consider a heater in 3 steps. L-M-H
I do hope that with your additional accessory the window will become warm enough.

thanks, for your advice. L-M-H,is very good idea.

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