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Making your own dew shield
Posted 20 November 2007 - 03:51 PM
I was considering using roofing felt as it is black, non reflective, stiff and can be cut into whatever length is required.
Do people think this would be a good idea?
Also, what length are Dew shields normally, i.e. how far do they extend beyond the end of the scope in order to get decent dew reduction but not result in significant light loss.
I am hoping to maybe reduce the glare from my neighbours garage which seems to reflect the orange street lights, of which there are lots, directly down one side of my scope.
Any help much appreciated.
Posted 20 November 2007 - 03:53 PM
Posted 20 November 2007 - 04:00 PM
Posted 20 November 2007 - 04:08 PM
Gona spray it blue to match the scope but it already has a nice textured aluminium finish, just cut to-go round your tube, Velcro the full length and bingo cheapest dew shield possible
Posted 20 November 2007 - 05:58 PM
Posted 20 November 2007 - 06:23 PM
Posted 21 November 2007 - 09:58 PM
It longer than it actually is as the dew shield is pulled down by 5cm over the rim of the tube so I think I have a 25cm dew shield which based on the 1.5 ratio to diameter of the primary is not too bad.
I just need some clear skies to test it out.
Any comments welcome.
Posted 21 November 2007 - 10:21 PM
Posted 22 November 2007 - 10:38 PM
Posted 22 November 2007 - 10:52 PM
Posted 26 November 2007 - 04:59 PM
The scope was out for about 4 hours and not one bit of dew on the mirrors in all that time, and it was really cold on Friday. The outside of the tube was like ice and the eyepiece was dewed up, but not the primary or the secondary.
I am going to declare this a success.
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