Quote:
Originally Posted by Omaroo
At the end of the day - I guess I'd rather heat air than potentially alter/deform the refractive qualities of a finely ground and collimated fluorite objective by heating it directly. Hmm... the debate rages on... LOL!
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Sorry Chris I have to strongly agree with Monte on this one.
You're right to say the water vapor is in the air but it will only condense onto a surface that is colder than the dew point. If you keep the metal holder of your lenses warm just above it then you have no problem. Regardless of the air in front of the glass surface. How do you keep the air just in front of your lens warm enough when there's a breeze anyway. Besides any metal/glass exposed to the night sky will "freeze" well below ambient air temperature even if you've got a air dryer handy. It won't last long. Nichrome wire cut to size wound up around the tube is the only way to go. Gentle heat transfers through metal to glass.
