dob secondary help

[astrokat]

whats the best way to prevent due setting on the secondary im guessing a due heater of some sort can anyone point me in the right direction please

[Astro_Baby]

A dew shield - either make one from a camping mat or buy one. Usually a dewshield will work and will also help with reducing stray light.

I have a 12v hairdryer as a back up but my experience to date has been if the secondary dews with the dewshield then the primary will be in trouble as well very quickly. You could heat the primary as well but the two times the dews been that bad EVERTHING was getting soaked instantly, eyepieces, the finder, me

Water was running off the scope like it was under a tap.

A normal dewshield should be enough for most conditions though.

[astrokat]

will it not make a diffrence if a flexi tube otherwise i will get on the case i thought may need a dew strap

[Astro_Baby]

Well I assume you have a shroud for the scope ? If not I'd ask another flextube owner because I suspect you'd need a shroud as well but I dont know.

[Moonshane]

you can use a dew strap but a dew shield will work well - easier and cheaper to try first. also, I have found leaving the focuser empty causes problems so always leave in the plug when not in use and obviously point the scope away from directly at the sky.

[perrin6]

I use a hairdryer on a long extension cable (careful not to point it too close or might crack the diagonal ??)

[astrokat]

thanks for the advice guys ive got a shroud sorted ive tryed a dew sheild today though its a bit floppy and not holding well on the scope if i use a dew strip can it be run off a small battary i want to get a fue fans on the primary aswell that need power any advice on this