Temp equalization AKA cool down time for small Mak?
- pakarinen
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Temp equalization AKA cool down time for small Mak?
Wondering if there's an average recommended cool down time for small Maks. I took out my new 90 this morning and without waiting I had a look at Jupiter. Mush. The moon wasn't bad though. Collimation seems good and I know seeing plays a part, but it was a bit of a concern.
I realize going from 70 F to 20 F will take longer than 70 F to 60 F.
Thanks.
I realize going from 70 F to 20 F will take longer than 70 F to 60 F.
Thanks.
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I drink tea, I read books, I look at stars when I'm not cursing clouds. It's what I do.
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Re: Temp equalization AKA cool down time for small Mak?
So what was the temperature differential this moring between the warm OTA and the cold air? Cool down time is ALL contingent on the temperature differential and how much cooling needs to occur.
JT
JT
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- pakarinen
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Re: Temp equalization AKA cool down time for small Mak?
About 40 degrees difference.
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I drink tea, I read books, I look at stars when I'm not cursing clouds. It's what I do.
=============================================================================
AT50, AT72EDII, ST80, ST102; Scopetech Zero, AZ-GTi, AZ Pronto; Innorel RT90C, Oberwerk 5000; Orion Giantview 15x70s, Vortex 8x42s, Navy surplus 7x50s, Nikon 10x50s
I drink tea, I read books, I look at stars when I'm not cursing clouds. It's what I do.
=============================================================================
AT50, AT72EDII, ST80, ST102; Scopetech Zero, AZ-GTi, AZ Pronto; Innorel RT90C, Oberwerk 5000; Orion Giantview 15x70s, Vortex 8x42s, Navy surplus 7x50s, Nikon 10x50s
- Lady Fraktor
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Re: Temp equalization AKA cool down time for small Mak?
I would set it out about 30 minutes before hand if possible.
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Re: Temp equalization AKA cool down time for small Mak?
That sounds about right, what I remember from when I had a small closed tube Mak.Lady Fraktor wrote: ↑Tue Mar 17, 2020 8:41 pm I would set it out about 30 minutes before hand if possible.
My sub
My MK66 can take 45 minutes. But since it’s a Rutten Mak with 3 secondary collimating screws it announces being good by stars ceasing to be triangles.
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Re: Temp equalization AKA cool down time for small Mak?
Jupiter rides low in Sagittarius now, not a good target to check scope performance.
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Re: Temp equalization AKA cool down time for small Mak?
Thirty minutes sounds all right to me. It is about the same time as my 102mm Mak needs. The 102 Mak may take several minutes more.
Isolating the tubewall on the outside doesn't take the equilibrium time down, as is believed by some. It simply mutes the seeing inside the tube. I take my isolated 102mm Mak out for grab &go on Jupiter as well. Didn't believe it at first. Until I noticed a transit of Callisto, hardly visible in my old 70mm Televue Pronto.
Isolating the tubewall on the outside doesn't take the equilibrium time down, as is believed by some. It simply mutes the seeing inside the tube. I take my isolated 102mm Mak out for grab &go on Jupiter as well. Didn't believe it at first. Until I noticed a transit of Callisto, hardly visible in my old 70mm Televue Pronto.
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Re: Temp equalization AKA cool down time for small Mak?
Isolating the tube wall with insulation definitely helps. My 7 inch Mak can take hours to reach equilibrium in winter if brought out from a warm room. If I insulate the tube I can be observing in minutes and when seeing has allowed, 450x magnification was possible soon after setting up. When looking at a defocused star image without insulation, the heat plume from the central baffle is obvious as a rising heat spike, which is not visible when using insulation. Another benefit is it keeps dew at bay. I've had nights where the insulation is saturated, but the corrector lens is dry.
Ivan
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Re: Temp equalization AKA cool down time for small Mak?
Hmm, question, how does insulating the OTA help with cool down?
Would not the insulation hold the heat in the scope?
What am I missing?
Would not the insulation hold the heat in the scope?
What am I missing?
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- notFritzArgelander
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Re: Temp equalization AKA cool down time for small Mak?
It reduces temperature differences. It's differential strain caused by temperature gradients that distort the optics.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 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 IV, Vixen Porta II, Celestron CG5
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