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Karl_Bonner_1982
sage
Reged: 05/13/09
Posts: 304
Loc: Springfield, Oregon (4.5ish ma...
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As some of you probably already have heard more than once, I'm switching from the Orion 127mm Mak to the Orion 80ED. The Mak's OTA is 14.5 in. and weighs 8.6 lbs, while the 80ED is 23.5 in. and weighs 5.7 lbs. Both scopes have the majority of their weight at the end(s) of the tube rather than the center.
I'm not sure of the exact leverage physics involved, but I'd imagine that the Mak would still require slightly more support after accounting for both weight and length. That means that an ED80 should work on any mount that adequately supports the Mak.
I just wanted to run this by some of you who can answer this question more authoritatively. If it turns out that the ED80 actually requires more support than the Mak, can I just add an additional impromptu counterweight or will the whole mount be unusable?
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A lot of signatures are just there because people think they are "supposed" to have a signature.
Edited by Karl_Bonner_1982 (10/21/09 02:29 AM)
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Lane
Carpal Tunnel
Reged: 11/19/07
Posts: 1515
Loc: Frisco, Texas
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My C6 is about the same size and weight as your mak and I would say it is less stable on my small mounts than my ED80. My small mounts being the AT Voyager and a Manfrontto 501HDV video head and 3036 tripod.
I do use rings on my ED80 instead of that little photo tripod plate that come on the scope. The rings add some weight but also add a great deal of stability.
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Mounts: CGEM, ORION SIRIUS, AT Voyager/motorized
SCTs: C6, C8, C9.25, C11,
Refractors: TV Pronto, Orion ED80
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Karl_Bonner_1982
sage
Reged: 05/13/09
Posts: 304
Loc: Springfield, Oregon (4.5ish ma...
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Thanks, looks like I'm in business then.
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A lot of signatures are just there because people think they are "supposed" to have a signature.
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Jared
Carpal Tunnel
Reged: 10/11/05
Posts: 2538
Loc: Piedmont, California, U.S.
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Quote:
As some of you probably already have heard more than once, I'm switching from the Orion 127mm Mak to the Orion 80ED. The Mak's OTA is 14.5 in. and weighs 8.6 lbs, while the 80ED is 23.5 in. and weighs 5.7 lbs. Both scopes have the majority of their weight at the end(s) of the tube rather than the center.
I'm not sure of the exact leverage physics involved, but I'd imagine that the Mak would still require slightly more support after accounting for both weight and length. That means that an ED80 should work on any mount that adequately supports the Mak.
I just wanted to run this by some of you who can answer this question more authoritatively. If it turns out that the ED80 actually requires more support than the Mak, can I just add an additional impromptu counterweight or will the whole mount be unusable?
The moment arm of inertia on the two optical tubes is actually very close. Depending on exactly how much of the weight is concentrated at the ends, either one could actually be more challenging from a pure torque perspective. Likewise, the two optical tubes will have nearly identical cross sectional areas, so the "sail" factor should be a wash. The 80mm is, of course, substantially lighter. Yes, I would say that any mount that can handle the Make will also be able to handle the refractor.
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- Jared Willson
- TMB 152 f/8 Apochromat
- Fluorostar FLT-110 w/ TEC optics
- Stellarvue SV80S
- Astro-Physics Mach1 GTO
- Takahashi Teegul SP Mount
- STL-11000
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RAKing
Carpal Tunnel
Reged: 12/28/07
Posts: 2090
Loc: West of the D.C. Nebula
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The equation for calculating all this is: weight x distance = moment. To be precise, you should locate the center of gravity for each OTA, then calculate the percentage of the total weight on each end by measuring from the CG. I suspect the Mak is actually better balanced, because the meniscus balances out the primary mirror fairly well. The 80mm refractor probably has the majority of its weight at the object cell.
So much for academics. I really think if your mount can handle the Mak, it should be able to handle the 80mm just as well. 
Ron
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Time spent looking at the stars is added to your life.
Tak FS-128, C925-CF, C6SE, other stray cats and refractors.
A-P Mach1 GTO
Zeiss orthos to Ethos - and some stuff in between.
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