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Celestron Scope Repair
Hi all,
I may have an opportunity to purchase a C-5 but was told that the corrector plate is cracked. I'm wondering how much would it cost me to have it fixed by Celestron. I have tried to email to Celestron but seems they did not include an email contact. Is it possible to repair the damage myself if I can get Celestron to send me the corrector plate assembly or does it need special alignment at Celestron ? I live in S.E. Asia. Thanks and best regards -- If replying directly, please delete "abc" from e-mail address. Thanks |
#2
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yes, I'd second that. However low the price might be, it almost certainly
isn't a bargain. I'd recomend you pass Krill "Al" wrote in message . net... "Jornada" wrote in message ... Hi all, I may have an opportunity to purchase a C-5 but was told that the corrector plate is cracked. I'm wondering how much would it cost me to have it fixed by Celestron. I have tried to email to Celestron but seems they did not include an email contact. Is it possible to repair the damage myself if I can get Celestron to send me the corrector plate assembly or does it need special alignment at Celestron ? I live in S.E. Asia. Thanks and best regards -- If replying directly, please delete "abc" from e-mail address. Thanks If you are considering this purchase, replacing the corrector could be expensive (living in Asia, it will probably be more expensive). This is a job that should be done by Celestron, as it may also require that the primary mirror be changed. To the best of my knowledge, mirror and corrector are a matched set. Since you live in Asia, I don't believe that Celestron will deal with you directly. You may have to go to the Celestron dealer in your area for more information. You may want to take a pass on this purchase. Al |
#3
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Hello,
Do *not* buy the scope. Just my advice - John "Jornada" wrote in message ... Hi all, I may have an opportunity to purchase a C-5 but was told that the corrector plate is cracked. I'm wondering how much would it cost me to have it fixed by Celestron. I have tried to email to Celestron but seems they did not include an email contact. Is it possible to repair the damage myself if I can get Celestron to send me the corrector plate assembly or does it need special alignment at Celestron ? I live in S.E. Asia. Thanks and best regards -- If replying directly, please delete "abc" from e-mail address. Thanks |
#4
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"Jornada" wrote in message
... Hi all, I may have an opportunity to purchase a C-5 but was told that the corrector plate is cracked. I'm wondering how much would it cost me to have it fixed by Celestron. I have tried to email to Celestron but seems they did not include an email contact. Is it possible to repair the damage myself if I can get Celestron to send me the corrector plate assembly or does it need special alignment at Celestron ? I live in S.E. Asia. Thanks and best regards The corrector plate requires special alignment to function correctly. It will have to be returned to either the local Celestron agent or more likely to the US factory for repair via the local agent. Cost for such a job is going to run in to several hundred USD in shipping costs plus the cost of the repairs. Frankly it's not worth considering unless the scope is in the USA. Ian |
#5
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Please excuse a different viewpoint, but if this is inexpensive enough,
it might be worth a try. I don't know the price for a replacement corrector plate, but I believe the procedure is simple enough, and no more complicated than replacing an objective in a refractor. The catch can come in matching the corrector plate with the primary mirror, and it would be necessary to determine if they must be matched, or not. I think that on the C5, it might not be required, while on the larger Celestrons, it is desireable, but not rigidly required. Just my two cents worth. hdh Jornada wrote: Hi all, I may have an opportunity to purchase a C-5 but was told that the corrector plate is cracked. I'm wondering how much would it cost me to have it fixed by Celestron. I have tried to email to Celestron but seems they did not include an email contact. Is it possible to repair the damage myself if I can get Celestron to send me the corrector plate assembly or does it need special alignment at Celestron ? I live in S.E. Asia. Thanks and best regards -- If replying directly, please delete "abc" from e-mail address. Thanks |
#6
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The other obvious [???] question is what degradation does the current crack
induce? Undoubted some stray light scattered by the crack, but unless the corrector plate is physically deformed, it should still perform its job. If the scope is cheap enough, maybe the views are acceptable. Or, am I just misunderstanding something? Jim "Dwight Huffman" wrote in message ... Please excuse a different viewpoint, but if this is inexpensive enough, it might be worth a try. I don't know the price for a replacement corrector plate, but I believe the procedure is simple enough, and no more complicated than replacing an objective in a refractor. The catch can come in matching the corrector plate with the primary mirror, and it would be necessary to determine if they must be matched, or not. I think that on the C5, it might not be required, while on the larger Celestrons, it is desireable, but not rigidly required. Just my two cents worth. hdh Jornada wrote: Hi all, I may have an opportunity to purchase a C-5 but was told that the corrector plate is cracked. I'm wondering how much would it cost me to have it fixed by Celestron. I have tried to email to Celestron but seems they did not include an email contact. Is it possible to repair the damage myself if I can get Celestron to send me the corrector plate assembly or does it need special alignment at Celestron ? I live in S.E. Asia. Thanks and best regards -- If replying directly, please delete "abc" from e-mail address. Thanks |
#7
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I'd look real hard at a new 5" Celestron's price first. Personally, I'm
not sure I'd want to deal with this if someone *gave* me the scope -- and I live two miles from Celestron, so logistics would be easy. Also -- not clear if this is a total system, including mount, or just an OTA he would be buying. If the latter, I would compare it to buying a new 5" OTA. If the former, he might get a good mount ot of the deal, however the OTA issues turned out. Repairs and parts do not come cheap. I had my C5+ recoated and recollimated by Celestron in June and the cost was $175. Worth it to me (small, portable and has a really good mount, wedge and tripod). BTW -- I wonder how stars look through a cracked corrector? Phil Dwight Huffman wrote: Please excuse a different viewpoint, but if this is inexpensive enough, it might be worth a try. I don't know the price for a replacement corrector plate, but I believe the procedure is simple enough, and no more complicated than replacing an objective in a refractor. The catch can come in matching the corrector plate with the primary mirror, and it would be necessary to determine if they must be matched, or not. I think that on the C5, it might not be required, while on the larger Celestrons, it is desireable, but not rigidly required. Just my two cents worth. hdh Jornada wrote: Hi all, I may have an opportunity to purchase a C-5 but was told that the corrector plate is cracked. I'm wondering how much would it cost me to have it fixed by Celestron. I have tried to email to Celestron but seems they did not include an email contact. Is it possible to repair the damage myself if I can get Celestron to send me the corrector plate assembly or does it need special alignment at Celestron ? I live in S.E. Asia. Thanks and best regards -- If replying directly, please delete "abc" from e-mail address. Thanks |
#8
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Just thinking Jim,
isn't the purpose of the corrector plate simply to make the mirror "think" it is parabolic as opposed to its spherical figure? At only 5 inches, a sphere and a parabolic figure are so close, that he may not even need the corrector plate at all! How much different is a sphere from a parabola at only 5 inches? FWIW Clear Skies, Tom W. Jim Hewitt wrote: The other obvious [???] question is what degradation does the current crack induce? Undoubted some stray light scattered by the crack, but unless the corrector plate is physically deformed, it should still perform its job. If the scope is cheap enough, maybe the views are acceptable. Or, am I just misunderstanding something? Jim "Dwight Huffman" wrote in message ... Please excuse a different viewpoint, but if this is inexpensive enough, it might be worth a try. I don't know the price for a replacement corrector plate, but I believe the procedure is simple enough, and no more complicated than replacing an objective in a refractor. The catch can come in matching the corrector plate with the primary mirror, and it would be necessary to determine if they must be matched, or not. I think that on the C5, it might not be required, while on the larger Celestrons, it is desireable, but not rigidly required. Just my two cents worth. hdh Jornada wrote: Hi all, I may have an opportunity to purchase a C-5 but was told that the corrector plate is cracked. I'm wondering how much would it cost me to have it fixed by Celestron. I have tried to email to Celestron but seems they did not include an email contact. Is it possible to repair the damage myself if I can get Celestron to send me the corrector plate assembly or does it need special alignment at Celestron ? I live in S.E. Asia. Thanks and best regards -- If replying directly, please delete "abc" from e-mail address. Thanks |
#9
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that's a fine point you make (despite my earlier suggestion to pass on
this). I hadn't considered the value of the mount. If it is going cheap, and includes the mount, it might be worth buying it, discarding the OTA and buying a new one. C-5s have pretty good equatorial mounts, I believe Regards Krill "Phil Wheeler" wrote in message ... I'd look real hard at a new 5" Celestron's price first. Personally, I'm not sure I'd want to deal with this if someone *gave* me the scope -- and I live two miles from Celestron, so logistics would be easy. Also -- not clear if this is a total system, including mount, or just an OTA he would be buying. If the latter, I would compare it to buying a new 5" OTA. If the former, he might get a good mount ot of the deal, however the OTA issues turned out. Repairs and parts do not come cheap. I had my C5+ recoated and recollimated by Celestron in June and the cost was $175. Worth it to me (small, portable and has a really good mount, wedge and tripod). BTW -- I wonder how stars look through a cracked corrector? Phil Dwight Huffman wrote: Please excuse a different viewpoint, but if this is inexpensive enough, it might be worth a try. I don't know the price for a replacement corrector plate, but I believe the procedure is simple enough, and no more complicated than replacing an objective in a refractor. The catch can come in matching the corrector plate with the primary mirror, and it would be necessary to determine if they must be matched, or not. I think that on the C5, it might not be required, while on the larger Celestrons, it is desireable, but not rigidly required. Just my two cents worth. hdh Jornada wrote: Hi all, I may have an opportunity to purchase a C-5 but was told that the corrector plate is cracked. I'm wondering how much would it cost me to have it fixed by Celestron. I have tried to email to Celestron but seems they did not include an email contact. Is it possible to repair the damage myself if I can get Celestron to send me the corrector plate assembly or does it need special alignment at Celestron ? I live in S.E. Asia. Thanks and best regards -- If replying directly, please delete "abc" from e-mail address. Thanks |
#10
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Hi,
Thanks to all for your advice. I have decided not to purchase the scope. Apparently, the corrector plate is not cracked but gone! The owner attached reattached the secondary mirror via 3 spider legs, much like a Newtonian...heh... regards -- If replying directly, please delete "abc" from e-mail address. Thanks "Bored Huge Krill" wrote in message ... that's a fine point you make (despite my earlier suggestion to pass on this). I hadn't considered the value of the mount. If it is going cheap, and includes the mount, it might be worth buying it, discarding the OTA and buying a new one. C-5s have pretty good equatorial mounts, I believe Regards Krill "Phil Wheeler" wrote in message ... I'd look real hard at a new 5" Celestron's price first. Personally, I'm not sure I'd want to deal with this if someone *gave* me the scope -- and I live two miles from Celestron, so logistics would be easy. Also -- not clear if this is a total system, including mount, or just an OTA he would be buying. If the latter, I would compare it to buying a new 5" OTA. If the former, he might get a good mount ot of the deal, however the OTA issues turned out. Repairs and parts do not come cheap. I had my C5+ recoated and recollimated by Celestron in June and the cost was $175. Worth it to me (small, portable and has a really good mount, wedge and tripod). BTW -- I wonder how stars look through a cracked corrector? Phil Dwight Huffman wrote: Please excuse a different viewpoint, but if this is inexpensive enough, it might be worth a try. I don't know the price for a replacement corrector plate, but I believe the procedure is simple enough, and no more complicated than replacing an objective in a refractor. The catch can come in matching the corrector plate with the primary mirror, and it would be necessary to determine if they must be matched, or not. I think that on the C5, it might not be required, while on the larger Celestrons, it is desireable, but not rigidly required. Just my two cents worth. hdh Jornada wrote: Hi all, I may have an opportunity to purchase a C-5 but was told that the corrector plate is cracked. I'm wondering how much would it cost me to have it fixed by Celestron. I have tried to email to Celestron but seems they did not include an contact. Is it possible to repair the damage myself if I can get Celestron to send me the corrector plate assembly or does it need special alignment at Celestron ? I live in S.E. Asia. Thanks and best regards -- If replying directly, please delete "abc" from e-mail address. Thanks |
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