DIY dewshield tips anyone? What have you used?
Posted 12 March 2013 - 06:06 PM
Posted 13 March 2013 - 09:03 AM
This has lasted years in South West Florida where humidity can effect the trajectory of 7.62mm. It also is a stray light shield.
Posted 13 March 2013 - 10:02 AM
Posted 13 March 2013 - 11:27 AM
Posted 13 March 2013 - 11:34 AM
We make our "Farpoint" brand dew sheilds from .040" thick ABS plastic with 2" velcro closures and a foam strip.
thanks for the tip, I did something similar with some extra kydex laying around for my surplus shed 127f5.5 frac. But I used the smelly contact cement to apply the velcro, I don't think my sears sewing machine would take well going thru the kydex, leather ok but kydex?
Posted 13 March 2013 - 12:58 PM
Posted 13 March 2013 - 01:05 PM
Posted 13 March 2013 - 02:12 PM
Posted 13 March 2013 - 02:16 PM
Posted 13 March 2013 - 02:34 PM
do you add any type of flocking, as the PVC seems a bit shiny?
you could do it with prostar's flocking material which is pretty much kydex with a synthetic suede material on one side.
Posted 14 March 2013 - 01:09 PM
Posted 14 March 2013 - 01:24 PM
The dewshield on the guidescope is made from a thin sheet of black foam rubber from an art store. The material was cut to length, wrapped snuggly around the tube with about 1/2" of overlap, and the seam bonded with hot-melt glue.
Posted 14 March 2013 - 01:26 PM
Posted 14 March 2013 - 07:09 PM
Posted 14 March 2013 - 08:09 PM
Posted 14 March 2013 - 09:07 PM
Saw the tube with two parallel cuts, about 1/2 inch to an inch apart, parallel to the pipe axis. Released molding stresses cause the pipe to contract. Thus, it will grab a range of telescope tube sizes.
The interior can be roughened with sandpaper and/or painted flat black, or install black flocking paper, or velvet.
For uniform external appearance, wipe the ABS DWV outside with MEK, lacquer thinner, etc.
Orient the sawed slot down , away from the sky.
Posted 14 March 2013 - 11:33 PM
Posted 15 March 2013 - 06:03 PM
Posted 15 March 2013 - 06:23 PM
For eyepieces, I cover the one that I'm using in the focuser with an large old pill container. For the eyepieces I'm not using, I just put a Hothands handwarmer in my eyepiece case thus keeping them warmer than the ambient dewpoint. Works for me. I have occasionally taped one to the main tube opening while I'm waiting for the scope to thermally stabilize.
Maybe this should be posted somewhere else as it doesn't provide much information on setups for dew prevention. Sorry!
Posted 15 March 2013 - 06:35 PM
Posted 17 March 2013 - 08:51 PM