Lightweight dew shield for C11

[5ash]

Have started fabricating a dew shield + tube insulator out of Ametalin insulation(Bunnings). My celestron 9.25”/11” dew shield weighs 800g whereas my partly completed non flocked dew shield + tube insulator weighs only 280g. Have enclosed pics of my progress, regard philip

[doug mc]

Looks like foam sandwiched with reflective foil. Should work very well. Darkening inner surface before the corrector plate would be your next job.

[Drac0]

I've seen a number of insulated setups, both newts & refractors. Is it useful/effective? What's the main purpose behind doing it - just to achieve a relatively constant tube temp?

Cheers,
Mark

[iborg]

Hi All


Philip - looks good, I used something similar from Clark Rubber, it was silver on just the one side.


Mark - my understanding is that insulating the tube reduces heat flow, which reduces/eliminates tube currents.


Philip

[bojan]

Yep...
https://www.iceinspace.com.au/forum/attachment_browse.php?a=295966

[Drac0]

Thanks Philip. Had some insulated foam laying around in the garage for years, will think about putting it into use.

Cheers,
Mark

[5ash]

Finished product with black felt. I have made a similar one to the celestron DX C’9.25-C11 dew shield not shown in the pictures. Mine weighs in at 220 grams whereas the celestron weighs in at 800 grams. This material is very light yet strong.

[JohnF]

Been wanting a Dew shield for my C925. May have to consider making one like yours.

[dikman]

Nice job. What did you use to stick the felt on with, given that contact adhesive tends to give off fumes that can settle on things?

[5ash]

It was a self adhesive felt material I bought on eBay. Regards philip

[dikman]

Ahh, that makes sense, I'm still stuck in the world of volatile contact adhesives (probably what's scrambled my brain cells, along with too much alcohol in my long-ago youth).

[iborg]

Hi


I suspect the black felt is a better black than the black rubber I have inside mine. I should probably add some.


Philip

[miker]

Hi Philip, nice job on the insulation. Which particular Ametalin product did you use? There are quite a few on their web site. I can't tell which product has silver on both sides.
Thanks for posting your project.

Michael