Results 1 to 9 of 9
Like Tree26Likes
  • 7 Post By TheFatKitty
  • 1 Post By bladekeeper
  • 5 Post By j.gardavsky
  • 6 Post By Gabby76
  • 2 Post By bladekeeper
  • 2 Post By Leveye
  • 3 Post By j.gardavsky

Thread: Refractor cool down times..?

  1. #1
    TheFatKitty's Avatar
    TheFatKitty is offline HYPER GIANT
    Points: 22,651, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 9.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!365 Days+ Registered Achievement!5 Threads Achievement!50 Posts Achievement!
    Join Date
    May 2015
    Location
    TO, Canada
    Posts
    1,962
    Points
    22,651
    Level
    100
    Thanks
    1,135
    Thanked 963x 639 Posts
    Downloads
    8
    Uploads
    0

    Default Refractor cool down times..?



    This morning I was up at the crack of 4:15. Thank you, Mr. Bladder. I took a peek out the back door and was treated to a very clear sky. Knowing that Ganymede was going around the back of Jupiter, I thought it might be worthwhile to stay up. I keep a 102SLT (OTA on a pipe mount) for a quick grab 'n' go at the door. At only f/6.5, it's not the best on planets, though. I put it outside, and went to get my orange C80 (f/11.3 ).
    I would have gotten my dob, but since it was -19C (1F) out, I knew the Sun would be up before it cooled
    Brought the 80 out, and since ten minutes had passed, I thought I would take a look through the 102. It should be cooled down, as supposedly 'fracs are way faster at that than dobs. Uh-huh. Tried to focus, no go. Hmmm. Went inside for 10 minutes (coffee), and thought, OK, 4:35, should be good. Been outside for 20 mins. Go back out, a little better, but still no sharp focus. Tried the 80. It was like trying to use my dob after 5 minutes in this cold.
    By the time the 102 was good to go, it was ten to five. Nice view, but a little too much CA for me on Jupiter. Over to the 80, and it was still a bit fuzzy. It was 5:10 before it settled into its usual self.

    So all that to say, it took the 102mm 25 minutes to cool, and the 80mm 45 minutes.

    Is this normal? I've had both out at 10C (50F) and in 5 minutes, they're good to go. I guess 45-50 degrees F might make a difference. I'm wondering if it's the volume or displacement of the air inside the tubes; perhaps that's why the 102, even though larger in diameter, took less time to cool that my long 80mm.

    Anyways, just my observations. I've only owned any type of refractor since last summer, so this was new to me. In hindsight, I should've brought out the dob... Still, the view was great through the 80; saw all four moons (including Ganymede, slipping in behind the gas ), and a pinkish dot which I knew was the GRS. So I'm happy. And tired
    More coffee!


    All the best,

    Mark
    Last edited by TheFatKitty; 01-08-2017 at 07:13 PM. Reason: Tired...:)
    j.gardavsky, DeanD, Peppy2 and 4 others like this.
    Skywatcher 12" Dob
    Celestron C80-HD & SLT102
    Celestron by Vixen C80, old CG4, Canon T3
    Towa Tasco's: '61 12TE, modded 55VTE, 11TE-5
    Sears 6331, Towatron 60mm f/7



    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.
    src="
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.
    border="0" alt="" />www.NCC-1701.ca

  2. #2
    bladekeeper's Avatar
    bladekeeper is offline Super Moderator
    Points: 207,133, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.9%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Awards:
    Activity Award
    Join Date
    Aug 2014
    Location
    Lowell, Arkansas, USA
    Posts
    30,358
    Points
    207,133
    Level
    100
    Thanks
    21,896
    Thanked 13,369x 9,190 Posts
    Downloads
    8
    Uploads
    0

    Default Re: Refractor cool down times..?

    I'll say the larger the temperature differential, the longer the cool down time.

    I set mine out yesterday about 1600 hrs., so I had about a 3 hour window for acclimatization. No issues for me (expect for Ol' Hateful).

    Granted, your's was impromptu, and with the looming dawn, not much time to wait it out.

    Maybe, if you anticipate a good sky with the next Cracking Bladder, set the scope out the evening before?
    TheFatKitty likes this.
    Bryan
    Scopes: Apertura AD12 f/5; ES AR127 f/6.4; ES AR127 f/9.4; ES AR102 f/9.8; iOptron MC90 f/13.3; Orion ST80A f/5; Celestron Premium 80 f/11.4; Celestron C80 f/11.4; Meade NG60 f/10; Charmin TP40 f/2.2
    Mounts: Bresser EXOS-2; ES Twilight I; ES Twilight II; iOptron Cube-G; AZ3/wood tripod; Vixen/Celestron Polaris
    Eyepieces: GSO Superview 30mm; ES 70°25mm; ES 82º Series; ES 62° 9mm; GSO 9mm Plössl; Zhumell Z Series 5mm; Vite Aspherics23mm, 10mm, 4mm; Orion Expanse 20mm, 9mm; BCO 10mm
    Binoculars: Pentax PCF WP II 10×50, Bresser Corvette 10×50, Bresser Hunter 16×50 and 8×40, Garrett Gemini 12×60 LW, Gordon 10×50
    Observing: Herschel Tallies: H1 = 400/400 H2 =310/400 H3 = 212/300; 2,853 observations of 1,750 objects; The Breeders - Cannonball

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.
    Days since last observing session: 2; Sessions in last 30 days: 6; Last night's excuse: Windy as all get out, and soupy, cloudy sky.

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


  3. #3
    j.gardavsky's Avatar
    j.gardavsky is online now Super Moderator
    Points: 83,015, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.3%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience Points365 Days+ Registered Achievement!
    Join Date
    Feb 2011
    Location
    Germany
    Posts
    11,271
    Points
    83,015
    Level
    100
    Thanks
    9,705
    Thanked 6,724x 4,350 Posts
    Downloads
    0
    Uploads
    0

    Default Re: Refractor cool down times..?

    Re: So all that to say, it took the 102mm 25 minutes to cool, and the 80mm 45 minutes.

    Hello Mark,

    the difference in the cooldown times looks to me like some possible fogging on your 80mm, which might have sublimated away in 45 minutes.
    What helps on the refractors is to make a lens hood over the lens cell with some heat isolating material. This slows down the heat transfer and protects the lenses from fogging.
    Try it, if it helps, when not, then take into account longer cooldown times.

    Best,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW asph); EPs:Baader Classic Orthos; Leica B WW, Periplan, HC Plan S; Tele Vue; Swarovski SW; Pentax XW; ZEISS W & Zeiss diascope B WW T*; Carl Zeiss Jena; Filters: Astrodon, Astronomik, Baader (CCD), TS; Astrophotography: AstroTrac; Leica R7, R8: Leica 2.8/100mm and 3.4/180mm APO lenses; Zeiss Sonnar 4/300 on Nikon F70;
    Astronomy Forum Rules and Terms of Service
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

  4. The Following User Says Thank You to j.gardavsky For This Useful Post:

    TheFatKitty (01-08-2017)

  5. #4
    Gabby76's Avatar
    Gabby76 is offline Moderator
    Points: 50,094, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.7%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Awards:
    Hyperactive Geek - Silver 2rst place for Activity!
    Join Date
    Jan 2016
    Location
    Live: Slovakia Work: Canada
    Posts
    11,636
    Points
    50,094
    Level
    100
    Thanks
    2,118
    Thanked 3,598x 3,079 Posts
    Blog Entries
    3
    Downloads
    2
    Uploads
    0

    Default Re: Refractor cool down times..?

    A lot of things will determine cool down times. Temperature differential, thickness of tube/ glass. Usually the diagonal will take longer to cool than the scope will.
    I will usually set my diagonals out 15-20 minutes before taking the scopes out
    Refractors: Antares 105 f/15, Bresser 102 f/13.2, Celestron 102 f/6.5, 150 f/8, Stellarvue 80 f/6.9, TS 102 f/11, Vixen 115 f/7.7
    Mounts: Manfrotto 055PRO, Celestron SLT, Celestron CG-5/ Argo Navis, Vixen SXP Binoculars: Celestron Eyepieces: A-Z

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

    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle

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

  6. The Following User Says Thank You to Gabby76 For This Useful Post:

    sxinias (01-10-2017)

  7. #5
    bladekeeper's Avatar
    bladekeeper is offline Super Moderator
    Points: 207,133, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.9%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Awards:
    Activity Award
    Join Date
    Aug 2014
    Location
    Lowell, Arkansas, USA
    Posts
    30,358
    Points
    207,133
    Level
    100
    Thanks
    21,896
    Thanked 13,369x 9,190 Posts
    Downloads
    8
    Uploads
    0

    Default Re: Refractor cool down times..?

    Quote Originally Posted by Gabby76 View Post
    A lot of things will determine cool down times. Temperature differential, thickness of tube/ glass. Usually the diagonal will take longer to cool than the scope will.
    I will usually set my diagonals out 15-20 minutes before taking the scopes out
    Did not know that about diagonals. Interesting. And thanks for that tip.
    Leveye and Gabby76 like this.
    Bryan
    Scopes: Apertura AD12 f/5; ES AR127 f/6.4; ES AR127 f/9.4; ES AR102 f/9.8; iOptron MC90 f/13.3; Orion ST80A f/5; Celestron Premium 80 f/11.4; Celestron C80 f/11.4; Meade NG60 f/10; Charmin TP40 f/2.2
    Mounts: Bresser EXOS-2; ES Twilight I; ES Twilight II; iOptron Cube-G; AZ3/wood tripod; Vixen/Celestron Polaris
    Eyepieces: GSO Superview 30mm; ES 70°25mm; ES 82º Series; ES 62° 9mm; GSO 9mm Plössl; Zhumell Z Series 5mm; Vite Aspherics23mm, 10mm, 4mm; Orion Expanse 20mm, 9mm; BCO 10mm
    Binoculars: Pentax PCF WP II 10×50, Bresser Corvette 10×50, Bresser Hunter 16×50 and 8×40, Garrett Gemini 12×60 LW, Gordon 10×50
    Observing: Herschel Tallies: H1 = 400/400 H2 =310/400 H3 = 212/300; 2,853 observations of 1,750 objects; The Breeders - Cannonball

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.
    Days since last observing session: 2; Sessions in last 30 days: 6; Last night's excuse: Windy as all get out, and soupy, cloudy sky.

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


  8. #6
    Leveye's Avatar
    Leveye is offline Silver Supporter
    Points: 52,783, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 76.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Jan 2013
    Location
    Newport Oregon
    Posts
    7,549
    Points
    52,783
    Level
    100
    Thanks
    1,703
    Thanked 2,091x 1,887 Posts
    Downloads
    0
    Uploads
    0

    Default Re: Refractor cool down times..?

    I give all my scopes with the diagonals at least an hour sometimes 2. The eyepieces I am now keeping in my hoodie pocket nice and warm. Trying to let them acclimate as well has not worked this year for me.
    TheFatKitty and Gabby76 like this.
    My eyes
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

    1984 Meade 2120 10" SCT- 1998 U.S.A. made Celestron C8 SCT -StellarVue SV80ED Doublet- 1960's Homemade 6" F5.6 Newt - Astro Tech AT8IN Imaging Newt- Vintage 1961 H.O.C. made ATCO 80mm/1200mm refractor w/ original vintage eyepieces - Zhumell, Orion, Astro Tech 9x50 finderscopes - Orion Atlas AZ/EQ-G
    Unmodded Canon 5DMKiii - Modded Canon 700D/ T5i- ZWO ASI120MC CMOS - Meade DSI1 Mono CCD APT-PHD-CDC-PS-LR


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

  9. #7
    j.gardavsky's Avatar
    j.gardavsky is online now Super Moderator
    Points: 83,015, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.3%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience Points365 Days+ Registered Achievement!
    Join Date
    Feb 2011
    Location
    Germany
    Posts
    11,271
    Points
    83,015
    Level
    100
    Thanks
    9,705
    Thanked 6,724x 4,350 Posts
    Downloads
    0
    Uploads
    0

    Default Re: Refractor cool down times..?

    Thanks Gabby,

    I agree with the cooldown problems on the diagonal, as the quartz diagonal has quite a mass, and so its metal housing. It's a sort of wrong design for the cold environments, if compared with a high-end spotting scope protection of the prism, as designed for the temperatures down to -20°C, or even lower.
    Best,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW asph); EPs:Baader Classic Orthos; Leica B WW, Periplan, HC Plan S; Tele Vue; Swarovski SW; Pentax XW; ZEISS W & Zeiss diascope B WW T*; Carl Zeiss Jena; Filters: Astrodon, Astronomik, Baader (CCD), TS; Astrophotography: AstroTrac; Leica R7, R8: Leica 2.8/100mm and 3.4/180mm APO lenses; Zeiss Sonnar 4/300 on Nikon F70;
    Astronomy Forum Rules and Terms of Service
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

  10. #8
    12richardk's Avatar
    12richardk is offline HYPER GIANT
    Points: 11,249, Level: 73
    Level completed: 33%, Points required for next Level: 201
    Overall activity: 14.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!Gallery Achievement!
    Join Date
    Dec 2015
    Location
    Johannesburg/Prague
    Posts
    2,902
    Points
    11,249
    Level
    73
    Thanks
    105
    Thanked 523x 512 Posts
    Downloads
    0
    Uploads
    0

    Default Re: Refractor cool down times..?

    Interesting I do not have these problems at the moment but when I move back to Europe it will be, thanks for all the tips so if one leaves the diagonals out do you put then in a plastic bag or just open ? was wondering if dew gets in
    Richard
    Reflector GSO 200 Dobsonian F6 , Celestron skyprodigy 130 F5
    Refractors 80 William Optic ED Apo F6.8 on a SLT Mount , Tasco 10 TE-5 F 15 ,
    MCT Bosma 150 F12 on a EQ5
    SCT C5 Celestron F10 on a Skywatcher Alt/AZ Go To mount,

  11. #9
    j.gardavsky's Avatar
    j.gardavsky is online now Super Moderator
    Points: 83,015, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.3%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience Points365 Days+ Registered Achievement!
    Join Date
    Feb 2011
    Location
    Germany
    Posts
    11,271
    Points
    83,015
    Level
    100
    Thanks
    9,705
    Thanked 6,724x 4,350 Posts
    Downloads
    0
    Uploads
    0

    Default Re: Refractor cool down times..?

    Hello Richard,

    myself, I don't take the diagonal out, otherwise I would risk some humidity getting into the OTA.
    My scope is kept at a lower humidity environment (below 40%) than the regularly higher humidity outside.
    The scope is also kept in a not heated room, so the cooldown outside is fast and so much a problem.
    It may become a bit different, should your equipment be kept on display next to the fireplace, ha, ha.

    With my spotting scope, there is no problem at all.

    Best,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW asph); EPs:Baader Classic Orthos; Leica B WW, Periplan, HC Plan S; Tele Vue; Swarovski SW; Pentax XW; ZEISS W & Zeiss diascope B WW T*; Carl Zeiss Jena; Filters: Astrodon, Astronomik, Baader (CCD), TS; Astrophotography: AstroTrac; Leica R7, R8: Leica 2.8/100mm and 3.4/180mm APO lenses; Zeiss Sonnar 4/300 on Nikon F70;
    Astronomy Forum Rules and Terms of Service
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

  12. The Following User Says Thank You to j.gardavsky For This Useful Post:

    12richardk (01-09-2017)

 

 

Similar Threads

  1. Nester 6SE optimal cool down times
    By AuldAlliance in forum Celestron NexStar Telescope Forum
    Replies: 2
    Last Post: 12-15-2016, 02:05 PM
  2. Cool online or Android Based App for Lunar rise set times
    By DaltonSkyGazer in forum Astronomy Software Forum
    Replies: 5
    Last Post: 04-26-2012, 12:31 AM
  3. Cool Down Times
    By Nodgiles in forum Astronomy Beginners Forum
    Replies: 2
    Last Post: 12-31-2008, 11:06 PM
  4. Good Times BAD Times...
    By Saul Levy in forum General Astronomy Forum
    Replies: 1
    Last Post: 07-13-2004, 12:06 AM
  5. Cool down times in eyepieces...
    By Mike Fitterman in forum Amateur Astronomy Forum
    Replies: 2
    Last Post: 02-16-2004, 08:36 PM

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 12:02 PM.