Dew strap and metal dew shields?

[Peter_D]

Hi,

Quick question - are heated dew straps compatible with metal dew shields? I have a Meade 2080 with a metal dew shield and have not used it yet in cold temperatures.

Thanks

Peter

 

[Neil H]

Hi Peter i am sure they are i need some for my bresser wookie1965  has them on  his tal

Edited September 26, 2020 by Neil H

[TerryMcK]

Yes. All my refractors have metal dew shields and the dew straps work great on all of them. I put them in the vicinity of the lens cell for best results.

[Waldemar]

In fact they work better on metal dew shields then on plastic ones.

[wookie1965]

On 26/09/2020 at 09:36, Neil H said:

Hi Peter i am sure they are i need some for my bresser wookie1965  has them on  his tal

And my Meade one is homemade using resistors I am about to make one from nichrome wire. 

[10-7]

I have a apertura AD10" dob scope I live in mid Michigan, it gets cold up here ! Do I need to use a dew strap on my scope dew can be heavy up here,patio table can be very wet  ?

[discardedastro]

1 hour ago, 10-7 said:

I have a apertura AD10" dob scope I live in mid Michigan, it gets cold up here ! Do I need to use a dew strap on my scope dew can be heavy up here,patio table can be very wet  ?

For a dob, a wrap-around shield to give the secondary a little more cover is a no-brainer in my view; straps don't tend to really help, since the optics are decoupled from the outer tube. Big dobs can benefit from primary heating, but realistically if the primary's dewed up your conditions are probably poor enough to not be worth it. Glue-on secondary heaters can be a useful addition but definitely try passive methods (shields) before you muck about with that, since getting the wiring onto the spider without causing issues can be fiddly.