I have read that bagging or covering the corrector plate on an SCT or lens on a refractor (while still outside) can prevent moisture from forming as the scope warms up inside after a viewing session. Since the thermal mass of the scope is large compared with the volume of the trapped air inside the bag, I do not see this working well. The theory is that the cooler air will act as a buffer allowing the scope to gradually warm up, thus preventing the moisture from forming on the optics. Any thoughts?
Telescope Warm Up and Condensation
Started by Peter10, 01/03/2004 04:51PM
Posted 01/03/2004 04:51PM
Opening Post
Posted 01/04/2004 02:48PM
#1
Actually the theory is this:
The outside air is cold and therefore dry, thus warming it will not produce condensation. Condensation occurs when the cold corrector comes into contact with the warm inside air which is comparatively moist and has a higher dew point than the temperature of the corrector.
The question is whether the seal is sufficient to keep the inside air from intruding under the corrector cover.
jon
The outside air is cold and therefore dry, thus warming it will not produce condensation. Condensation occurs when the cold corrector comes into contact with the warm inside air which is comparatively moist and has a higher dew point than the temperature of the corrector.
The question is whether the seal is sufficient to keep the inside air from intruding under the corrector cover.
jon
