Jo, Your tip is a good one and works well. I should have thought of that as I got two boxes of hand warmers from San's for about $10 each. The temp if I remember right got down to about 10 degrees or 9 degrees F so yes, the dew out there went up to 90% and was thus frost. Lakeside had higher temps in the low 30's with only about 60% to 65% humidity. I think unless I am heading out for a quick session I am heading to Lakeside unless I have my dew heating stuff with me. I forgot it that night. On Mon, Nov 28, 2011 at 5:58 PM, Josephine Grahn <bsi@xmission.com> wrote:
If you do not have some sort of eyepiece heater, a great way to avoid frost is one of those disposable hand warmers. You activate it, and rubber band it to the eyepiece. It works like a charm. As Don says, pit n pole is especially prone to frost, but one handwarmer will keep your eyepieces clear for about 6 or 7 hours. Depending on the scope design, sometimes it can just be mounted on the eyepiece holder or the focuser, otherwise you need to switch it with the eyepieces.
Quoting "Don J. Colton" <djcolton@piol.com>:
I haven't been to Pit-N-Pole for several years but since it is near the
local valley floor it is particularly susceptible to frost and dew. I was out observing in Sandy and no frost appeared all night long but the skies were light polluted. The weather forecast said the dew point was 13 deg. F. I suspect the dew point was much higher at Pit-N-Pole or did it get that cold.
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