Smithfire Posted February 3, 2014 Share Posted February 3, 2014 Hi everyoneI use a 127 Mak and need a dewing solution. Dew shield, heater tapes, controller and power supply. Whats good, how much and where from.Many thanks Clive Link to comment Share on other sites More sharing options...
ChrisLX200 Posted February 3, 2014 Share Posted February 3, 2014 A dew shield is a must-have, made yourself from some foam sheet (camping groundsheet). That would take care of maybe 80% of your problem, the heater would take care of the rest. You can DIY a heater or buy a commercial unit, a simple 2-channel unit would be fine.ChrisH Link to comment Share on other sites More sharing options...
baggywrinkle Posted February 3, 2014 Share Posted February 3, 2014 If you go for the camping mat solution which is very cheap and easy, make sure you use a black mat. I used a blue one and it actually caused some image degredation as I got some stray light reflection on the inside.If you can use a matt black spray paint as well so much the better.Focus plates on Mak's and SCT are dew magnets..... Link to comment Share on other sites More sharing options...
Pete Presland Posted February 3, 2014 Share Posted February 3, 2014 I have dew shield for my c9.25 it helps keep it at bay for quite a whileSent from my GT-I9100 using Tapatalk 2 Link to comment Share on other sites More sharing options...
Smithfire Posted February 3, 2014 Author Share Posted February 3, 2014 Surely if you spray the inside of the mat with paint, aren't you going to stop it being hydroscopic? I thought they worked by absorbing the dew?Clive Link to comment Share on other sites More sharing options...
glappkaeft Posted February 3, 2014 Share Posted February 3, 2014 No, a dew shield just limits the flow of moist air across the lens (or telescope opening). Link to comment Share on other sites More sharing options...
Smithfire Posted February 3, 2014 Author Share Posted February 3, 2014 Then why make them out of foam matting? Clive Link to comment Share on other sites More sharing options...
glappkaeft Posted February 3, 2014 Share Posted February 3, 2014 It's a cheap, light and easy to work with material. Foam matting doesn't absorb water to any noticeable degree, if they did you would want to sleep on them. Link to comment Share on other sites More sharing options...
Killie Posted February 3, 2014 Share Posted February 3, 2014 I was lazy and just bought a pre-made Dew Shield and it has been a god send. So far managed to avoid needing a heater yet but to be honest i have only been doing 3 hour sessions at the most. Link to comment Share on other sites More sharing options...
Smithfire Posted February 3, 2014 Author Share Posted February 3, 2014 Hhhhhmmmm.....you learn something new every day!Clive Link to comment Share on other sites More sharing options...
DannyHarvey Posted February 4, 2014 Share Posted February 4, 2014 This makes a fantastic dew heat control if you can manage the mounting in a box: http://www.maplin.co.uk/p/mfa-panel-mounted-speed-regulator-module-rn41u Saves the pennies... r. Danny Link to comment Share on other sites More sharing options...
DannyHarvey Posted February 4, 2014 Share Posted February 4, 2014 There is even cheaper ready made circuits out there... Link to comment Share on other sites More sharing options...
Smithfire Posted February 4, 2014 Author Share Posted February 4, 2014 Have you made that module into a heater control Danny? Clive Link to comment Share on other sites More sharing options...
DannyHarvey Posted February 4, 2014 Share Posted February 4, 2014 Yes yes I did! - it works great: Link to comment Share on other sites More sharing options...
DannyHarvey Posted February 4, 2014 Share Posted February 4, 2014 Its not the exact same module here (although the circuit is identical) - the one I linked is the one with the panel mount pot on it. I got the same unit but with a little mini pot on it, which I had to remove and add a panel pot. Essentially I got the wrong unit (duh!) meaning I had a bit more work to do. If you get the linked one there is no re-soldering to do whatsoever.Dan Link to comment Share on other sites More sharing options...
Smithfire Posted February 4, 2014 Author Share Posted February 4, 2014 Good work mate!what do you use to power it?Clive Link to comment Share on other sites More sharing options...
DannyHarvey Posted February 4, 2014 Share Posted February 4, 2014 Straight on to a 7.5AH 12 V battery - sits on the EP tray on the mount - Although I have just bought a 15AH power tank from Maplin Link to comment Share on other sites More sharing options...
Smithfire Posted February 4, 2014 Author Share Posted February 4, 2014 How much was that? And would it run the drives in an EQ5 as well as the dew heaters?many thanks for the info!Clive Link to comment Share on other sites More sharing options...
faulksy Posted February 4, 2014 Share Posted February 4, 2014 This makes a fantastic dew heat control if you can manage the mounting in a box:http://www.maplin.co.uk/p/mfa-panel-mounted-speed-regulator-module-rn41uSaves the pennies...r.Dannyi used 3 of those pwm and housed them all in a box, you can see them mounted on the ep tray Link to comment Share on other sites More sharing options...
DannyHarvey Posted February 4, 2014 Share Posted February 4, 2014 wow that's a monster! Link to comment Share on other sites More sharing options...
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