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Where I live dew is horrendous. On about 75% of my viewing/imaging nights
it would be utterly impossible to continue without heaters on both the primary and secondary; the secondary dews up almost immediately.
I have had to modify one of my heaters to use on my widefield camera lenses.
I did an experiment the other night. After being outside for about 30mins
I wiped the lens and waited to see how long it would take to mist up again.
To keep the unheated lens clear I would have to wipe it every seven seconds;
a bit impractical methinks.
raymo
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