Alt / Az mounting my OMC140
- John Baars
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Alt / Az mounting my OMC140
The little 102mm Mak has an quiver time of less than half a second when focusing. Moving into Alt or Az is very smooth, with no noticeable vibrations.
The little Mak on Alt/Az
The almost double-weighted OMC140 makes that just two seconds. The Alt/Az movements are still smooth. But that depletion time is crippling for fun focusing on planets, for example. Too bad.
Until I started thinking logically and mounted the arm from which the telescope hangs upright on the tripod. This way the telescope does not "hang" behind the vertically running Azimuth axis (see above), but is balanced exactly above it.
OMC140 is balanced here, all brakes released.
The extinction time decreased by more than 1 second and sits just above half a second. Logical actually. Planet-worthy, even on Jupiter. At least now I can see that during focusing, the planet "clicks" into focus. Alt/ Az movements are still smooth. Really GrabnGo it's all not, of course, but I still catch a suddenly appearing Orion Nebula among the clouds. One drawback is that for zenith observing there is not enough space between zenith mirror and mount. In that case, a shorter zenith mirror mount and prism must be fitted.
Next to it hangs a clever 50mm viewfinder with Amici prism that can be transformed by changing eyepieces from 8X50, via 14X50 to 18X50. The latter is no superfluous luxury in my location.
Edit: With the 102mm Mak mounted this way, I hardly notice any vibration during focusing.
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.
- Bigzmey Online
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Re: Alt / Az mounting my OMC140
Like your wrap to.
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
- Lady Fraktor
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Re: Alt / Az mounting my OMC140
Vrolijk kerstfeest en een gelukkig nieuw jaar
The only culture I have is from yogurt
- John Baars
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Re: Alt / Az mounting my OMC140
Yes, pity it doesn't work with my 4 inch refractor. Can't get to the zenit unless in the old configuration. Too much torque in the wind-->trembling too..
I had never thought of rearranging. Was looking for a way to do it for my 4 inch refractor. It worked, but not enough. Mind the weight under the mount for better performance too.Lady Fraktor wrote: ↑Sat Dec 24, 2022 7:47 pm Very nice John, good that a simple rearrangement has worked well for you.
Vrolijk kerstfeest en een gelukkig nieuw jaar
Šťastné sviatky a bezpečný, krásny nový rok!
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.
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