Primary Mirror heating

[sn1987a (Barry)]

My 28, 18 and 16 do fog up occasionally mainly because I prefer to view without a shroud. On those occasions I just give the mirror a touch up with the 12v hair dryer. I'm taking the 28 out tonight and I expect early in the morning I might have to get the hair dryer out.

[Varangian (John)]

re. fogging the primary I think the OP has a solid tube OTA.

[sn1987a (Barry)]

12v hair dryer and a snout attachment then