Hi,
All Epsilon/Reflectors users, how do you deal with the dew?
I recently acquired an Epsilon 180 and have been imaging with it during the winter which has been dry. With the onset of spring, I am starting to see more dew. And I am expecting the dew to get heavier during the summer..
When I say dew, it heavily fogs up my primary and secondary.
As a desperate measure, I coupled two dew heaters and wrapped it on the OTA near the spider vanes, like how it is used in refractors. Which didn't do much to keep off the dew.
I've been reading about the secondary mirror heaters, primary mirror fans and dew shield.
Which of these is really effective?
I appreciate your inputs.
Thanks,
Deepan
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I would install the rear fan system and use a heated dew shield. I never ran into any problems in the PNW using these two.
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For my 130D I 3D printed a dew shield out of carbon fiber nylon. About 8 inches long with two raised sections to hold a dew strap in place. Works well. With a 180 you would probably have to make it in sections unless you have access to a really large volume printer.  |
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Best of all is to isolate the whole tube with reflective foam sheet AND add a rear fan (sucking, not blowing) AND add a dew shield, possibly made of the same reflective foam sheet.
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Deepan Vishal:
Hi,
All Epsilon/Reflectors users, how do you deal with the dew?
I recently acquired an Epsilon 180 and have been imaging with it during the winter which has been dry. With the onset of spring, I am starting to see more dew. And I am expecting the dew to get heavier during the summer..
When I say dew, it heavily fogs up my primary and secondary.
As a desperate measure, I coupled two dew heaters and wrapped it on the OTA near the spider vanes, like how it is used in refractors. Which didn't do much to keep off the dew.
I've been reading about the secondary mirror heaters, primary mirror fans and dew shield.
Which of these is really effective?
I appreciate your inputs.
Thanks,
Deepan If you'll be at NEAIC, I'm giving a talk on this very subject currently scheduled for Monday, April 7, 1pm - 2pm:  I'll tell you the best way to deal with dew and why.... John
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andrea tasselli:
Best of all is to isolate the whole tube with reflective foam sheet AND add a rear fan (sucking, not blowing) AND add a dew shield, possibly made of the same reflective foam sheet. *** Type your reply here *  |
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andrea tasselli:
Best of all is to isolate the whole tube with reflective foam sheet AND add a rear fan (sucking, not blowing) AND add a dew shield, possibly made of the same reflective foam sheet.
*** Type your reply here *
*That is eactly what I meant. Kudos!
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I installed a ZWO camera heater on the secondary mirror and control it via a Pegasus PBA. I also have a dew band around the rear of the tube but I'm not so sure its actually doing anything. Can see pics here: https://www.r3gdigital.com/blog/epsilon130prep |
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uk climate.... I sympathize as fellow Albion resident...
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andrea tasselli:
andrea tasselli:
Best of all is to isolate the whole tube with reflective foam sheet AND add a rear fan (sucking, not blowing) AND add a dew shield, possibly made of the same reflective foam sheet.
*** Type your reply here *
*That is eactly what I meant. Kudos! Thanks every one. Great discussion, I am going with something like this. I have the Astrozap and reflective foam sheet, waiting to but the Fan.
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I had issues with primary fogging up on my SCT aswell. This went away with the reflective insulation.
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The primary fan not only helps with dew but mitigates thermal tube currents that can distort stars. This was a huge problem with the 160ed.
FWIW, the fan and a dew shield was enough to keep dew off for me in the very humid NE USA.
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Well, I don't have one and still no problem with dew either. Insulation does it for me.
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I fitted the fan 1st but wasn't enough on its own.
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