Author Topic: "Dew Zap-On" Dew heaters?  (Read 356 times)

maulaepretag

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"Dew Zap-On" Dew heaters?
« on: December 23, 2017, 11:42:43 PM »
Im having significant dew problems with my 8" SCT here in Michigan.  These "Dew Zap-On" 9v heaters are relatively inexpensive and the simple fact that they don't need an external control is attractive, but I can not find much info on them.  Anyone use them?  Alternatively the Dew Buster controller looks really nice and seems to be quite popular here.  I wonder if its overkill for me personally though.



postbypopect

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Re: "Dew Zap-On" Dew heaters?
« Reply #1 on: December 27, 2017, 12:55:54 PM »
There's a few CN'ers who use and appreciate the ease of the Zap-on.
Convenience is the biggest factor. not being able to control the voltage is the only downside I see.

Mike

Michael Dinelli

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Re: "Dew Zap-On" Dew heaters?
« Reply #2 on: December 29, 2017, 12:16:25 AM »
Quote
There's a few CN'ers who use and appreciate the ease of the Zap-on.
Convenience is the biggest factor. not being able to control the voltage is the only downside I see.

Mike

What does that mean in use? Can to much heat hinder cool down, or cause undesirable currents?

I feel like Im just figuring out how to optimally cool down my 8" and now I'm looking into heaters to warm it back up haha . This hobby takes persistence!

ichpezafi

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Re: "Dew Zap-On" Dew heaters?
« Reply #3 on: December 29, 2017, 02:53:08 AM »
The middle ground seems to be a manual controller. What is the procedure with these, start low and turn it up as needed?

tailipoma

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Re: "Dew Zap-On" Dew heaters?
« Reply #4 on: December 30, 2017, 05:34:44 AM »
Silly question perhaps but have you tried a dew shield?
https://www.astrozap...p?idCategory=25

Of course that won't help the eyepieces or the finder if that is where you are having the problem.

cludertypos

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Re: "Dew Zap-On" Dew heaters?
« Reply #5 on: December 30, 2017, 09:47:10 PM »
Quote
Silly question perhaps but have you tried a dew shield?
https://www.astrozap...p?idCategory=25

Of course that won't help the eyepieces or the finder if that is where you are having the problem.

Not silly, but yeah I was using a dew shield, just a basic Celestron one. I didn't put it on until after cool down, maybe it was to late?

Im thinking about grabbing the Kendricks digifire 7 thats FS here, how big a deal is the thermostat control you get with the Dew Buster and Digifire 12? Is it an important feature for a casual observer? Is the advantage to these that you can stretch out your battery by using the minimum amount of heat necessary?

awesrasa

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Re: "Dew Zap-On" Dew heaters?
« Reply #6 on: December 31, 2017, 01:10:09 AM »
I would put the dew shield on before cool down.  As it cools it draws moisture. I would think the dew shield would help keep that away from the glass.  It also helps to shield from local light, street lights, etc. I use one on my 8" dob and on my 3" refractor for this purpose as well as keeping dew off.

Michael Greene

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Re: "Dew Zap-On" Dew heaters?
« Reply #7 on: December 31, 2017, 11:04:32 PM »
Quote
The middle ground seems to be a manual controller. What is the procedure with these, start low and turn it up as needed?

Ive found using a hair dryer in my opinion the best way to defeat the dew monster and inexpensive. I have also used dew heaters and straps.I definitely prefer the hair dryer.

longpetdowntown

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Re: "Dew Zap-On" Dew heaters?
« Reply #8 on: January 01, 2018, 09:28:48 AM »
I don't have a frequent dew problem but for those rare situations, I have a 12V hairdryer. $13. Gets the job done.  I power it from a car jump start pack.
http://www.amazon.co...ailpage_o08_s00

it works

Corey Howell

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Re: "Dew Zap-On" Dew heaters?
« Reply #9 on: January 04, 2018, 12:50:53 PM »
Quote
Quote

The middle ground seems to be a manual controller. What is the procedure with these, start low and turn it up as needed?

Ive found using a hair dryer in my opinion the best way to defeat the dew monster and inexpensive. I have also used dew heaters and straps.I definitely prefer the hair dryer.
Dew prevention is a far better solution than a cure once it starts.
A Dew controller set to low is best. For a very humid evening a mid setting might be required.

Mike

taibedaha

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Re: "Dew Zap-On" Dew heaters?
« Reply #10 on: January 10, 2018, 07:36:32 AM »
I ordered 2 of the dew-zap heaters on the 25th and got them today! I hope to use them tonight but clouds have been socked in for a long long time, but the sun is shinning right now ....................fingers crossed

good luck...............tim

Brian Olatunji

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Re: "Dew Zap-On" Dew heaters?
« Reply #11 on: January 11, 2018, 07:56:55 AM »
Quote
I ordered 2 of the dew-zap heaters on the 25th and got them today! I hope to use them tonight but clouds have been socked in for a long long time, but the sun is shinning right now ....................fingers crossed

good luck...............tim

Let me know how you like them! Good luck with the weather.

Corey Howell

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Re: "Dew Zap-On" Dew heaters?
« Reply #12 on: January 11, 2018, 11:42:53 AM »
Quote
I ordered 2 of the dew-zap heaters on the 25th and got them today! I hope to use them tonight but clouds have been socked in for a long long time, but the sun is shinning right now ....................fingers crossed

good luck...............tim

Mine arrived on Friday. Hoping to get out this weekend for a test flight in our cold mountain air and will report back.

Cheers,
John

Richard Ross

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Re: "Dew Zap-On" Dew heaters?
« Reply #13 on: January 12, 2018, 07:29:16 AM »
Just a little something aside- a dew heater and a dew shield will both be far more effective if you avoid pointing your scope high towards zenith; that will invite cold air to dump directly onto the corrector and can hasten dew formation.

slotiniphin

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Re: "Dew Zap-On" Dew heaters?
« Reply #14 on: January 18, 2018, 01:47:57 AM »
Quote
Quote
I ordered 2 of the dew-zap heaters on the 25th and got them today! I hope to use them tonight but clouds have been socked in for a long long time, but the sun is shinning right now ....................fingers crossed

good luck...............tim

Quote

I ordered 2 of the dew-zap heaters on the 25th and got them today! I hope to use them tonight but clouds have been socked in for a long long time, but the sun is shinning right now ....................fingers crossed

good luck...............tim

Mine arrived on Friday. Hoping to get out this weekend for a test flight in our cold mountain air and will report back.

Cheers,
John
I'm thinkng about the Zap On, really like the idea of not being tied to a battery.

Well, it looks like its been 7 weeks since you last posted. What's the verdict on the Zap On 9v dew heaters?