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mbalkham

Dew heating focuser draw tube

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I have recently received and insatlled the Kendrick Digifire FX Pro and secondary and guidescope heaters (see setup attached). I need also to heat the Baader coma corrector mkiii and light pollution filter installed on my baader protective t-ring inside the diamond steeltrack focuser (controlled by the steeltrack focus motor).  It gets dew fogged fairly regularly.  Not much room to apply heat and close to the camera (want to avoid heat at the sensor!) but I'm thinking of trying to heat the draw tube on the focuser. Any ideas on narrow heater bands or ones I can make holes in the bands to accomodate the focuser grub screws? I have also improvised a passive dew shield which def helps and if I cant heat this element I might need to explore improvements to that set-up.  Images below

Thanks in advance

 

Camera and focuser setup.jpg

Overall installation.jpg

Space for heater element between focus screns and camera body (16mm).jpg

total distance at approx focus point (40mm).jpg

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I ended up making my own custom heater from nichrome wire, insulating tape, neoprene and velcro. Fits around the screws (cutouts in the right place on the plastic backing board) and works pretty well on the test last night!

15686301480651586469324638378358.jpg

15686301913593841368550688080612.jpg

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