Telescope Focuser And Temperature Acclimationm

Discuss your refractor type scopes here.
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Refractordude
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Telescope Focuser And Temperature Acclimationm

#1

Post by Refractordude » Fri Oct 18, 2019 7:16 am

Did a two day test on a way to quicken cool down time for my 120mm f8 refractor. Both days the inside temperature was around 75 degrees, and outside temperature in the low 50s degrees. Cool down time was 30 minutes for each day. The first day I left the focuser inside the telescope. The second day I fully extended the focuser tube outside the telescope. I used the moon as my target for the test. The first day tube currents made the surface of the moon look like it was submerged in water. The second day the surface of the moon was steady and sharp at 133.33 magnification.

What do you do to quicken temperature acclimation of your telescope?
Telescopes: Meade LX70 120mm f/8 Refractor, Vixen 70mm f/12.9 Refractor, Tasco 49N 50mm Red Refractor
Binoculars: Zhumell 20x80 Giant, Levenhuk Sherman 7x50
Mounts: Orion SkyView Pro Equatorial, Orion Versago II Altazimuth, Farpoint Universal Parrallogram Mount
Finders: GSO 8x50 Raci, Svbony Red Dot
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#2

Post by notFritzArgelander » Fri Oct 18, 2019 7:25 am

Nothing but plan ahead ahead. Gently slowly relaxes the glass. Set the OTA to cool soak in advance.
Scopes: Refractors: Orion ST80, SV ED80 A f7; Newtonians: Z12 f5; Catadioptrics: VMC110L, Intes MK66. EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion Sirius EQG
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#3

Post by JayTee » Fri Oct 18, 2019 7:31 am

What do you do to quicken the temperature acclimation of your telescope?
I drink beer! It relaxes me so I don't worry about the speed of optical cooling so much.

Just sayin',
JT
Main: C-stron CPC1100 #2 Scope: 8" f/7.5 Dob mounted Newt AP Scopes: TPO 6" f/9 RC, ES 80mm f/6 APO G&G Scope: Meade 102mm f/7.8, Bresser 102mm f/4.5 Guide Scopes: 70 & 80mm fracs Mounts: C-stron AVX CGEM & GT Alt-Az, Meade DS2000 Cameras: Canon T3i (x2), ASI120MC Binos: 10X50,10.5X70,15X70 (x2), 25X100 EPs: ES: 21 100°, 30 82° X-Cels: 9, 12, 18, 25 Clubs: RCA & HAS
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#4

Post by yobbo89 » Fri Oct 18, 2019 12:02 pm

Cooling fans is the way to go, but many don't want to modify thier ota,s, other then that just keep busy for 30 mins.
scopes :gso/bintel f4 12"trust tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
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extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel
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#5

Post by Lady Fraktor » Thu Nov 14, 2019 8:20 pm

I would not really want to mount a cooling fan into a refractor tube.
These were designed for cooling Cat/ Mak tubes but work well for refractors as well.
http://www.lymax.com/
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Proper Telescopes: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNGDX 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen ED115s f/7.7
Mounts: Celestron AS-GT, Celestron CG-5 w/ Argo Navis & tracking motor, SLT w/ pier & tripod mods, Manfrotto 028b w/ SV M2C, Mantrotto 055Pro w/ 128RC, TAL MT1C, Vixen SXP w/ HAL-130 & half pier
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#6

Post by UlteriorModem » Thu Nov 14, 2019 8:44 pm

Yep planning ahead is actually the best idea. Having a beer doesn't hurt either :D

I am lucky that my 10" RC stays outside under covers almost all of the time. It would take a loooong time for that mirror to equalize!

ps; I don't think that pulling out the focuser would really make that much of a difference. Probably just seeing conditions.
Tom

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#7

Post by notFritzArgelander » Thu Nov 14, 2019 9:47 pm

I'm all for planning ahead to drink beer. ;)
Scopes: Refractors: Orion ST80, SV ED80 A f7; Newtonians: Z12 f5; Catadioptrics: VMC110L, Intes MK66. EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion Sirius EQG
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#8

Post by John Baars » Fri Nov 15, 2019 9:17 am

I set my telescope up. Go inside to drink some coffee with my wife and than go out again for some observing.
Telescopes in Schiedam : SW 150mm F/5 Achromat, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 maksutov F/14.3, SW 102MAK F/13 on Vixen GPDX.
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Astronomical Rijswijk observatory telescopes: Astro-Physics Starfire 130 f/8 on NEQ6, 6 inch Newton on GP, C8 on NEQ6, Meade 14 inch SCT on EQ8, Lunt.

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#9

Post by Thefatkitty » Fri Nov 15, 2019 5:47 pm

I would say just giving it time outside. My 10" lives outside in the shed all covered, so it's always acclimatized :D The fracs live in the basement, so they need time... As for speeding it up, I'll go with beer as well; unless it's early morning. Then I'll have coffee; no need for a wake 'n' bake :lol:

Lately with the temps in the teens to low 20's F (-10 to 0C), it takes about 45 minutes, especially for the long f/l ones.

I did discover one thing the other night when it was 15F (-10C). I took out my orange C80, which originally had the objective cover inside the aluminum dew shield. This was awkward, so I replaced it with one I made from a margarine container lid, some plastic and good ol' duct tape. Much easier, and it's a snug fit.
I let the scope sit for almost an hour. I went out, and saw I hadn't taken the cover off the dewshield. I went to do that, and for the life of me, it wouldn't budge! Seems the plastic contracts more/faster than aluminum in the cold...:lol:

Took the scope inside, was able to get it off after almost 15 minutes, took the scope back outside, let it cool down again...!! Lesson learned :D

Yup, time and beer; good call on both counts. And remove all plastic covers beforehand ;)

All the best,
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