New insulation- jacket for 140 mm Maksutov
- John Baars
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New insulation- jacket for 140 mm Maksutov
The old foil had been there for almost 20 years. And there were also a few holes and loose patches, due to varying insights into what accessories had to be put on the telescope over the years. The dew shield was made of double black display cardboard, with a newspaper in between. A good moisturizer. In the years that I used the telescope intensely, there was only one condensation, which was dealt with quickly with a hair dryer.
I cut the dew shield open to size and the newspaper of July 7, 2001 reappeared. It turned out to be a science supplement, so carefully selected at the time.
The new insulation jacket for the telescope willingly folded around the tube and I attached the ends together with one long and wide piece of clear tape. If I wanted it off, it would not be a big problem. The old foil had been stuck with it for almost twenty years, so I have never shown a strong urge to remove it again.
I made the new dew shield from the same material, with protostar adhesive flocking material on the inside. The foil cannot be bent very nicely if the carrier underneath (adhesive flocking material) is so flexible, which is why you see some corners at the end. The stars don't mind.
Everything works as usual. Seeing that is created in the tube itself by turbulent air as a result of strong cooling remains reasonably calm. It stays relatively warm in the tube and cooling is very slow and not turbulent. Even with the intense seeing last night, at a magnification of 200+, I could see the thin diffraction ring around Airy's disc. Although it moved rapidly and kept falling apart, it was much better than without insulation. Without insulation a diffraction ring is almost impossible to find at all. With or without insulation: It's about two points difference on the Pickering scale. See the difference here between rating 4 and 6 : http://www.damianpeach.com/pickering.htm
The performance of an OMC140 is roughly equivalent to a good 10cm ED refractor, albeit with some minor differences. It depends a bit on the taste of the observer which of the two is preferred. Read more on that in the conclusions here: viewtopic.php?t=6650
Attached is a photo
GrabnGo on Alt/AZ : *SW Startravel 102 F/5 refractor( widefield, Sun, push-to), *OMC140 Maksutov F/14.3 ( planets).
Most used Eyepieces: *Panoptic 24, *Morpheus 14, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Commonly used bino's : *Jena 10X50 , * Canon 10X30 IS, *Swarovski Habicht 7X42, * Celestron 15X70, *Kasai 2.3X40
Rijswijk Public Observatory: * Astro-Physics Starfire 130 f/8, * 6 inch Newton, * C9.25, * Meade 14 inch LX600 ACF, *Lunt.
Amateur astronomer since 1970.
- Lady Fraktor
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Re: New insulation- jacket for 140 mm Maksutov
The last aluminium dewshield I made was slightly oval and the stars did not seem to mind that either.
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- John Baars
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Re: New insulation- jacket for 140 mm Maksutov
Thank you for your kind wordsLady Fraktor wrote: ↑Mon Nov 28, 2022 5:48 pm Very nice John, hopefully this version will last you another 20 years as well!
The last aluminium dewshield I made was slightly oval and the stars did not seem to mind that either.
Stars do not care about the looks of a telescope,....only many humans do.
GrabnGo on Alt/AZ : *SW Startravel 102 F/5 refractor( widefield, Sun, push-to), *OMC140 Maksutov F/14.3 ( planets).
Most used Eyepieces: *Panoptic 24, *Morpheus 14, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Commonly used bino's : *Jena 10X50 , * Canon 10X30 IS, *Swarovski Habicht 7X42, * Celestron 15X70, *Kasai 2.3X40
Rijswijk Public Observatory: * Astro-Physics Starfire 130 f/8, * 6 inch Newton, * C9.25, * Meade 14 inch LX600 ACF, *Lunt.
Amateur astronomer since 1970.
- John Donne
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Re: New insulation- jacket for 140 mm Maksutov
More clear skies to you.
MOUNTS: SW AZ/EQ5, MEADE LXD75, CELESTRON CG4, Farpoint Parallelogram.
BINOCULARS: CL 10X30, Pentax 8X43, 25X100 Oberwerks.
EP: Many.
"I am more than a sum of molecules.
I am more than a sum of memories or events.
I do not one day suddenly cease to be.
I am, before memory.
I am, before event.
I am"
- Bigzmey Online
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Re: New insulation- jacket for 140 mm Maksutov
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Delos, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
Diagonals: Baader: BBHS mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: 2" prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC.
Solar: HA: Lunt 50mm single stack, W/L: Meade Herschel wedge.
Observing: DSOs: 3122 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2196, S110: 77). Doubles: 2461, Comets: 34, Asteroids: 261
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Re: New insulation- jacket for 140 mm Maksutov
seriously if it works why not.
you can spend more time looking at the stars.
good thing.
REFRACTOR , TS-Optics Doublet SD-APO 125 mm f/7.8 . Lunt 80mm MT Ha Doublet Refractor .
EYEPIECES, Delos , Delite and 26mm Nagler t5 , 2 zoom Svbony 7-21 , Orion Premium Linear BinoViewer .
FILTER , Nebustar 2 tele vue . Apm solar wedge . contrast booster 2 inches .
Mounts , cg-4 motorized , eq6 pro belt drive .
“Your assumptions are your windows on the world. Scrub them off every once in a while, or the light won't come in.”
― Isaac Asimov
Jean-Yves
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