Telrad dew guard

[Daniel-K]

recently bought this http://www.firstlightoptics.com/finders/dew-shield-for-telrad-finder.html  to battle dew on the telrad and had its first outing on monday night. i opted for the mirror one £25 lest just say im not impressed it doesn't hold the dew off for long. i was putting it back every time i stopped looking trough it and the mirror is utterly useless. so now i have it what to do with it to improve it? any body else have one?

Dan

[faulksy]

2, 330 ohm resistors 1/4 watt and you will be sorted cost you 0.80p though

[Pete Presland]

I could not agree more, the worst £25 i have spent for a while. I just use my fan heater on it the same as my C9.25

Sent from my GT-I9100 using Tapatalk 2

[Mike73]

I had one....about as much use as a chocolate ashtray!

Then I tried the Telrad heaters which worked great but take up alot of space inside the window so it can be a little tricky to get your head in the right spot.

Now I'm using a homemade foam dew cover, I hate it but its better than nothing.

[Daniel-K]

2, 330 ohm resistors 1/4 watt and you will be sorted cost you 0.80p though

sort it out lad im desperate

[rory]

I just wiped it with my finger . It's not an expensive multicoated optic or anything , just little piece of your big standard glass.

BUT it took me a while to catch on. , so used to handling anything you look through with kid gloves.

[Daniel-K]

I just wiped it with my finger . It's not an expensive multicoated optic or anything , just little piece of your big standard glass.

BUT it took me a while to catch on. , so used to handling anything you look through with kid gloves.

but doing that makes it look all fuzzy and it does my nut in!

[rory]

Ah, I get ya. I had a dew shield on my telrad . But it didn't hold the wet stuff off for long. They seem to attract dew big time don't they.

[faulksy]

sort it out lad im desperate

ok Dan, i'll do it asap

sent from my Sony Xperia

[m.tweedy]

Get one of thesehttp://www.telescopehouse.com/acatalog/info_AC281.html

Here's an old post but still relevant on how to make a coverhttp://stargazerslounge.com/topic/61552-telrad-frost-dew-cover/

HOWEVER

I downloaded the template off here and never had a problem sincehttp://www.homebuiltastronomy.com/downbino/HomeBuiltAstronomy-TelradDewShield.html

[Bart]

Try this brilliant

http://stargazerslounge.com/index.php?/topic/203117-Telrad-Heater---Here-goes%21%21

Barry

[Mike73]

ok Dan, i'll do it asap

sent from my Sony Xperia

I know its very basic stuff for you Mike but would you mind letting me know exactly what bits to get? Also wheres the best place to get resistors etc?? Last time I had anything to do with electrics was when I drilled into a live ring main which was er interesting!!

[faulksy]

I know its very basic stuff for you Mike but would you mind letting me know exactly what bits to get? Also wheres the best place to get resistors etc?? Last time I had anything to do with electrics was when I drilled into a live ring main which was er interesting!!

thats funny mike, i have drilled well nailed into a gas pipe thats was fun soldering it up. maplins is your best bet i think they were £0.39p each 2 would be good, 330 ohm i think 1/2 watt, i will have a look now and put the link up

http://www.maplin.co.uk/p/metal-film-06w-330-ohm-resistor-m330r

wire them in parrallel not series though, you could just use a small 9v battery and holder with a switch like this, dont no how long it will last though, i use a battery pack with control for my eps and finder, but it should last easy 20 hours

http://www.maplin.co.uk/p/1-9v-switched-battery-box-l90an

hope this helps. let me no

[Mike73]

Ideal...

If you see on the news of a Cornish astronomer with 3rd degree burns on his nose then you know its me and something went badly wrong! 

[Caldwell14]

Yep they're rubbish, mine did'nt a thing to stop dew forming sadly.

[jason.p]

I found the dewshield next to useless, so I made up a small heater circuit with 330ohm resistors. The diagram is for the Rigel, but the principle is the same. I made it up then shaped it to fit, not pretty, but works a treat. If you have any probs getting the resistors pm me, they're sold by the hundred so I've got one or two left over and I'd be happy to send some on.