Dew Strap Placement
Posted 27 January 2010 - 02:14 PM
Posted 27 January 2010 - 02:17 PM
Posted 27 January 2010 - 02:37 PM
Posted 27 January 2010 - 04:05 PM
Posted 27 January 2010 - 09:33 PM
Posted 28 January 2010 - 09:25 AM
All the dew heater manufacturers recommend placement just behind the front cell of the OTA, on the OTA body itself.
Like Dan wrote. It works wonders for me in dew country.
Posted 28 January 2010 - 07:15 PM
Put them right where the lens is. The idea is to warm the lens, not the inside of the scope. Depending on where your dew shield sets, it may be on the dew shield, or just below it.
This isn't the way it works. The lens is typically isolated from the cell, and heating the cell is a near impossibility in any case. When you do heat the cell, because the lens usually has a cork shim or some other insulation from the cell, the way you are heating the lens is by heating the air behind the cell so that it rises to the cell.
This is horribly inefficient. Correct placement is on the tube behind the lens so that the warm air in the tube rises to heat the lens.
May sound awful but that's the way it works.