Hawkeye Posted December 15, 2013 Share Posted December 15, 2013 Hi All,I am sure this is a question that has been asked before but.....Where is the best place to put a dew heater on a SW200P reflector to prevent the secondary mirror dewing up ?By the way I was looking to build my own heater strips as the ready made ones seem very expensive for what they are!CheersPaul Link to comment Share on other sites More sharing options...
Oily Posted December 15, 2013 Share Posted December 15, 2013 I put my 'DIY' heater around the mounting of the secondary,the heat transmits through to the mirror. Link to comment Share on other sites More sharing options...
NGC 1502 Posted December 15, 2013 Share Posted December 15, 2013 Hi Paul. This link http://www.kendrickastro.com/astro/newtonian.html has details of different types of secondary heater (scroll down).You could perhaps copy the design for your DIY version.Regards, Ed. Link to comment Share on other sites More sharing options...
Hawkeye Posted December 26, 2013 Author Share Posted December 26, 2013 Thanks for the replies, looks like I have a little project for the next few days now. Sent from my Nexus 7 using Tapatalk Link to comment Share on other sites More sharing options...
glappkaeft Posted January 1, 2014 Share Posted January 1, 2014 Hi All,I am sure this is a question that has been asked before but.....Where is the best place to put a dew heater on a SW200P reflector to prevent the secondary mirror dewing up ?Have you tried a dew shield? Usually that is sufficient for Newtons. Link to comment Share on other sites More sharing options...
SW130p Posted January 1, 2014 Share Posted January 1, 2014 I made a long dew shield out of thin black foam from craft shops for my SW130p, been out in fairly damp nights with good results, no dew on the secondary, the tube was covered in dew so must be working. I did noticed that the RDF did start to mist up so I made a shield for that too which helped keep it clear. Now I have added a 6 resistor heater to the shield which has been brilliant.I'm thinking off making a heater for the secondary too but a bit worried as how the mirrror is attatched to the stem. Is it glued? if so won't the heat soften the glue and cause the mirror to fall and damage the primary? Link to comment Share on other sites More sharing options...
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