Quote:
Originally Posted by astronobob
Keool Alex 
Would one of these be of use.
30mm x 30mm 5V |
In a fit of isolation inspired engineering I have made a crude copy of the fine work shown by Alex in another post.
Using a 30mm fan much like this one, running off a wall wart,
I attached it to the rail on my SCT so it blows across the lens hood
Of a piggybacked lens.
With the fan being so tiny I did not notice any vibration.
The wall wart is a 9v and my fan is 12v so it is running slower.
I also put a layer of foam rubber either side of the bracket
I made, sandwiching it so that it provides a sort of shock absorber
Between the fan and the body of the SCT.
Last night was not particularly humid but after about 2hours the SCT corrector
Was starting to get foggy where the lens was not.
I'm calling that a success and thanks Alex for the great idea.
Next phase is to turn the fan around so it blows across the corrector.
PS it worked well but my photos were crap so not showing here.