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SCT Collimation
How well do Celestron SCT's hold collimation typically? Do they require
frequent re-collimating, if transported and used gently, or is collimation a once-every-few-months sort of thing? Thanks!! |
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Rank Amateur wrote: How well do Celestron SCT's hold collimation typically? Do they require frequent re-collimating, if transported and used gently, or is collimation a once-every-few-months sort of thing? Thanks!! I haven't had to recollimate mine in over a year. But, unfortunately I don't get it out very often, especially recently. But, it holds collimation extremely well. |
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tedkord wrote:
I haven't had to recollimate mine in over a year. But, unfortunately I don't get it out very often, especially recently. But, it holds collimation extremely well. Does your scope hold collimation when the primary mirror flops (i.e., when the scope passes from E to W or v.versa)? |
#4
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Rank Amateur wrote:
How well do Celestron SCT's hold collimation typically? Do they require frequent re-collimating, if transported and used gently, or is collimation a once-every-few-months sort of thing? Thanks!! In three years, with frequent use, my C-8 was collimated twice, about three days apart. Once to get it close, then again when the seeing improved to provide steady diffraction rings around stars. I haven't needed to touch it since. Clear Skies, Uncle Bob |
#5
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you should be checking it every time you use it just likeyou zip up your
LL Beans. Rank Amateur wrote: How well do Celestron SCT's hold collimation typically? Do they require frequent re-collimating, if transported and used gently, or is collimation a once-every-few-months sort of thing? Thanks!! |
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A member of our observing group has a 15 year old C8 that has never
needed colimation! Ans we look to see if it needs it quite often. My 13 year old C11 needs colimation about once a year, but at this level we are talking about colimation errors so small that the typical observer could let it go for years at a time. Super picky observers will end up colimating every time the sky is good enough to colimate. With a C11, these kinds of skys only show up a dozen times a year, and we only end up observing on 2 or 3 of these (moonless) nights. With a C8 many nights (25%) are good enough to colimate. |
#7
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The answer to this question is "depends upon who does the collimating".
If done properly it almost never needs adjustment. Proper tension on all three screws is the key. Gil |
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