Results 1 to 7 of 7
  1. #1
    Draoul's Avatar
    Draoul is offline White Dwarf
    Points: 1,245, Level: 20
    Level completed: 45%, Points required for next Level: 55
    Overall activity: 0%
    Achievements:
    First 1000 Experience Points365 Days+ Registered Achievement!750 Days+ Registered Achievement!1000 Days+ Registered Achievement!
    Join Date
    Nov 2010
    Location
    Tolland ct usa
    Posts
    1
    Points
    1,245
    Level
    20
    Thanks
    0
    Thanked 0x 0 Posts

    Default When to use heater?



    I just purchased my 1st scope - an Orion 10' DOB. At what temp shoul I be using a heater? Thanks, Dennis

  2. #2
    jimt's Avatar
    jimt is offline Super Moderator
    Points: 37,302, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience PointsGot three Friends20+ Friends Achievement!5+ Referrals Achievement!
    Join Date
    Jul 2009
    Location
    North Georgia
    Posts
    5,715
    Points
    37,302
    Level
    100
    Thanks
    1,338
    Thanked 2,734x 1,769 Posts

    Default

    Welcome to the forum Dennis. Do you mean a heater to keep warm, or a heater to ward off dew? Grats on the new glass, thats a nice scope.

    Jim
    Celestron C9.25. Atlas EQG mount. Canon 500D unmodded, Celestron ST80 guide scope, SSAG, Meade 6.3 FR, Thousand Oaks dew control with Dewnot straps. Zhumell 8/24mm Zoom, 2"Gso Superview 42mm, Meade 2"QX wide angle 30MM, Meade 1.25 EP and filter set. Tasco 10x50 Zhumell 20x80 bino and a few other odds and ends.
    Now where did I put that clear sky button!

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  3. #3
    Joe Lalumia's Avatar
    Joe Lalumia is offline HYPER GIANT
    Points: 61,001, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!Got three FriendsFirst 1000 Experience Points20+ Friends Achievement!
    Join Date
    Jun 2010
    Location
    Quinlan, Texas
    Posts
    10,947
    Points
    61,001
    Level
    100
    Thanks
    6,772
    Thanked 5,156x 3,400 Posts
    Blog Entries
    1

    Default

    Hard for us to tell you WHEN?

    Certainly before you notice that all your books and papers are soaking wet!
    ETX 125PE, Stellarvue 80mm BV & Televue TelePod tripod,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8" LNT, 10x50, 15x70mm binoculars, Stellarvue binoviewers, solar filters for all three
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ..... plus a bunch of ham radios... Ham radio call sign - W1XWX

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    TelescopeMan Web Site

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    search for W1XWX to see my amateur radio web site

    "If you can't explain it to a six year old, you don't understand it yourself.” - Albert Einstein

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  4. #4
    Bob327's Avatar
    Bob327 is offline HYPER GIANT
    Points: 41,366, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    10 Days registered200+ Posts Achievement!First 1000 Experience PointsGot three Friends365 Days+ Registered Achievement!
    Join Date
    Sep 2009
    Location
    Frederick Maryland
    Posts
    9,247
    Points
    41,366
    Level
    100
    Thanks
    19
    Thanked 4,039x 3,068 Posts

    Default

    Dennis....
    I'm confused also... your mirrors should be at the ambient temperature IF you are getting dew problems a simple fan should take care of the problem and if you use a tarp to set the rocker box on instead of on plain grass that cuts moisture also..

    Guys like myself who run SCTS...need dew shields and sometimes dew heaters to keep the corrector on the front of out scope 1-2 degrees above the ambient temp to prevent dew formation....

    Bob G
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

  5. #5
    Bob327's Avatar
    Bob327 is offline HYPER GIANT
    Points: 41,366, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    10 Days registered200+ Posts Achievement!First 1000 Experience PointsGot three Friends365 Days+ Registered Achievement!
    Join Date
    Sep 2009
    Location
    Frederick Maryland
    Posts
    9,247
    Points
    41,366
    Level
    100
    Thanks
    19
    Thanked 4,039x 3,068 Posts

    Default

    OPPS ...the last statement I mad was faulty.... just realized my mistake:

    The heater strips DO NOT keep the corrector lens 1-2 degrees above ambient ..they keep it 1-2 degrees above the DEW POINT.....

    Bob G
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

  6. #6
    DaveW's Avatar
    DaveW is offline HYPER GIANT
    Points: 13,128, Level: 79
    Level completed: 8%, Points required for next Level: 322
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience PointsGhost Achievement! Averaging 5+ posts a day!365 Days+ Registered Achievement!100+ Threads Achievement!
    Join Date
    Jun 2010
    Location
    Saskatoon, Canada
    Posts
    1,792
    Points
    13,128
    Level
    79
    Thanks
    100
    Thanked 621x 447 Posts

    Default

    That's interesting Bob. Is that how most work for SCTs?

    I was looking at secondary mirror heaters for newtonians the other day and most of them just set to a specified temperature above ambient. It would definitely be more efficient to use the dew point though, but would be more costly in including a RH sensor and probably a small microcontroller.
    Zhumell Z10,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    114EQ, 10x50 and 15x70 Binoculars
    Zhumell 2" UHC Filter
    Hyperion 8mm GSO Superview 30mm and a whole case full of Plossls

    Saskatoon, SK - 106W, 52N

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  7. #7
    Joe Lalumia's Avatar
    Joe Lalumia is offline HYPER GIANT
    Points: 61,001, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!Got three FriendsFirst 1000 Experience Points20+ Friends Achievement!
    Join Date
    Jun 2010
    Location
    Quinlan, Texas
    Posts
    10,947
    Points
    61,001
    Level
    100
    Thanks
    6,772
    Thanked 5,156x 3,400 Posts
    Blog Entries
    1

    Default

    Yes many high end DOBS have secondary mirror dew heaters built-in. Just set it on LOW when you setup-- if it starts dewing up raise the temperature a little bit.
    ETX 125PE, Stellarvue 80mm BV & Televue TelePod tripod,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8" LNT, 10x50, 15x70mm binoculars, Stellarvue binoviewers, solar filters for all three
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ..... plus a bunch of ham radios... Ham radio call sign - W1XWX

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    TelescopeMan Web Site

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    search for W1XWX to see my amateur radio web site

    "If you can't explain it to a six year old, you don't understand it yourself.” - Albert Einstein

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

 

 

Similar Threads

  1. dew heater or a aquarium heater for $7
    By pescude in forum ATM DIY Telescope Making Forum
    Replies: 17
    Last Post: 12-29-2011, 08:51 PM
  2. Dew heater for DOB
    By tech11165 in forum Orion Telescopes Forum
    Replies: 11
    Last Post: 06-09-2009, 09:52 PM
  3. dew heater
    By Richard Darn in forum Amateur Astronomy Forum
    Replies: 1
    Last Post: 04-19-2005, 08:45 PM
  4. Where to put a dew heater
    By Steve Maddison in forum Amateur Astronomy Forum
    Replies: 10
    Last Post: 12-04-2004, 04:09 PM
  5. dew heater
    By MoFoYa in forum Amateur Astronomy Forum
    Replies: 7
    Last Post: 12-03-2004, 02:11 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 01:05 PM.