SCT Dewing

I'm looking for some tips on anti-dewing.

I have a c9, and 3 of the 4 times I've used it, it dewed up. This is in spite of the fact I'm running a Dew Buster, plus the flexible dewshield.

The scope seems to be the only thing with dew for miles around. The relative humidity here (Colo) is about 30%-35% right now, but generally runs 20%-30%. For example, there's no dew on the grass, but the fallen leaves aren't 'crunchy' either.

I'm going to investigate ways to make the heater and shield fit around the dovetail plate better, but I can't see why such precision is necessary. I also have a medium sized refractor, never used heaters or fans or witchcraft, and never saw dew until I got the SCT.

Any thoughts?

Thanks,
sf

You may need to "reclean" the corrector. I bought a used C8 and had the same problem. Contacting the original owner he told me he "soaked" the corrector down with Windex to remove some sticky spots (bug juice or tree sap). I washed it in two gallons of distilled water with a couple drops of Dawn and 4 oz of iso alchohol, then rinsed it with distilled water alone. It seems the residue from the Windex "attracted" moisture from the air. Colorado also with less humidity, 18 to 25 %.

Steve

Not inside, just on the outside of the corrector.

Stanley, you said you are using the DewBuster... quick question, where are you positioning your heating strips? before the corrector lens rim, on it, or after it?

Make sure your strips are located right BEFORE the corrector lens rim, NOT on it, NOT after it... or your heating strips/dewbuster won't be working the way they are meant to be...


Clear Dewless skies!



Ivan 8)

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Try the Tuthill no du caps.

http://www.tuthillscopes.com/

Bill W.