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Mars on April 10-11
开云体育Dear All,Please find some images of Mars taken on April 10-11 with the Celestron 14 : Best regards Christian Viladrich |
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Re: C11 Edge HD Mirror Screws
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Rick,
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I'm not sure we are talking about the same 2
screws.? My C-14 (old, purchased 2002) has only those two.? The
instructions say they are for anchoring the morror when transportion the scope
so it doesn't flop around.? But the can be loose (but not disconnected)
when the scope is in use or in one place.
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I'm not sure about collimation, since when I follow
the instructions I get an incomplete circle of light from the unfocused test
star. That is, one side seems to have a dark tangent through it.? I get
good star images, but not perfect.? I think I need better collimation
instructions, since no image I obtain really match the ones in the Celestron
guide.
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Ed
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Re: C11 Edge HD Mirror Screws
Rick, This is actually not very likely to cause a problem since there are six other screws holding the tube in place.? My only real concern would be that the nuts will eventually work their way off the screws and fall inside the OTA.? Then there is the potential to scratch things, particularly the corrector. Ed Thomas Deep Space Products www.deepspaceproducts.com |
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Re: Vixen style dovebar for C-8 EdgeHD?
开云体育One trick I've used is to driil and tap? holes in the large bar and screw the small bar to it. Orion's cg5 bar for guidescope is long and cheap- if too long just cut it! Dan
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Re: C11 Edge HD Mirror Screws
Ed, ? Yes this is exactly what I loosened.? Accidentally loosened two of these screws.? Any thoughts on what could happen?? I assume the scope may continually loose collimation?? As I mentioned, I performed a star test and so far the scope seems to be in perfect collimation. ? Rick |
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Vixen style dovebar for C-8 EdgeHD?
Just got an 8" EdgeHD but the mounting plate is "CG5", which is sort-of Losmandy (but not really)?and I can put it on my AP-900.? It's a very nice "little" scope, tiny and toy-like compared to the C-14.? Produces very nice views. I want to use it on my small Vixen mount but I don't see that Celestron offers any Vixen style mounting bars.? I guess I'll go the?Orion store to see if I can adapt any of their hardware.? Unless anyone has a?better solution? Stan |
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Re: C11 Edge HD Mirror Screws
Unfortunately, what you are describing still doesn't really make sense.? There are no set screws that hold the mirror in place.? Assuming that you are talking about the rear cell, there are eight Phillips head screws around the circumference that hold the tube onto the rear cell.? These do not screw into the cell but instead are attached with small nuts on the inside of the OTA.? If you loosened these and they now turn freely, then it will be very difficult to get them retightened without taking the corrector off and reaching in there with a wrench to hold the nuts.? Sending the OTA back to Celestron will mean it will be gone for 6 weeks.? If you want to send the OTA in for a HyperTune I can have it back much sooner than that and of course solve this problem. Ed Thomas Deep Space Products www.deepspaceproducts.com |
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Re: C11 Edge HD Mirror Screws
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Rick,
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If you are referring to the two screws that emerge from
the back and hold the mirror in place when transporting the telescope, have you
tried pointing it at the zenith so the mirror will lie flat, then trying to
engage the screws?
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Ed
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C11 Edge HD Mirror Screws
When I was installing a CGE dovetail plate on the top of my C11 Edge HD OTA (to attach a guidescope) I accidentally loosened two of the screws that hold the mirror in place rather then the two accessory screws.? The two screws didn't come out of the tube but I can't retighted then (I assume they were held in place with some top of Loctite).? I have traded messages with Celestron technical support and they are suggesting that I ship the OTA back to them in order to fix it. ? Has anyone done this before and have you noticed any problems?? I have used the scope and based on a star test it appears to still be in perfect collimation.? There are a number of screws that hold the mirror in place and I only loosened two of them. ? Before I go through the pain of shipping the OTA back to Celestron I thought I would check with the group for any experience with this mistake. ? Any thoughts or comments would be most appreciated. ? Rick |
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Re: OTA upgrade advice wanted
开云体育Don,
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thanks for the insight on the mechanical side of auto focusing
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Ian,
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Yes I'd agree I have a small chip? (QSI 532 Camera) and there does not
seem to be a problem. some times I do not bother to alter the main focus to get
the required separation and do not notice any difference.
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Cheers Eric
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In a message dated 13/04/2014 23:45:32 GMT Daylight Time,
cosmoimager@... writes:
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Re: OTA upgrade advice wanted
As for the exact distance. It is important, but to a degree. If you use an APS-size chip camera (as I do) it is not that critical and you may get away with +/- 5mm or so from the 146mm. There was a graph by "C" on the topic. Of course when you approach the 40-50 mm image circle it becomes more and more important.
Ian |
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Re: OTA upgrade advice wanted
Eric wrote: "To maintain the critical distance of 146 mm I have attached a drinking straw of the correct length to the focal reducer plane and rack the moonlite in until this separation is reached focus as best I can with the native focuser and then lock the mirrors and fine tune with the moonlite.? Seems to work fine during the course of an evening.? I use maxim to try and get a fine auto focus.? I have more trouble with that than the actual mechanical side of things." The mechanical side is really the issue with autofocus software. When trying to converge on focus it is necessary to have linear, repeatable, smooth focuser ?movement. ?Autofocus software has a record of how well a focuser? performs with the software called the V curve. Crayford focusers don't necessarily have that smooth repeatable movement needed for autofocus software to converge on focus. See: ?BTW I only use my compliant moving mirror focuser on my C14 when in Hyperstar mode. Not because autofocus software ?like Focusmax and Maxium don't ?work , (they work excellent with the best V curve of any focuser) but because there is an optimal spacing between the primary and secondary which has the least abberations. Focusing by moving the mirror naturally changes this optimal spacing. I use a secondary focuser but it is my standard Bellerophon ?3" mounted on the rear? 3.29-16UN threaded ?C14 boss. This focuser has an ultra-low 1 inch profile but also can handle heavy ?large format CCD cameras such as the one shown mounted on a 60" RC ?shown here. ?? This is the same 3" Bellerophon focuser I use on my C14 as the secondary focuser. Don Clement |
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Re: OTA upgrade advice wanted
开云体育How critical is the 146 mm for visual use? ?I have a c14 hd that I use for visual and mallincam. I try to get close to the ideal but I have not been compulsive about it. ?Should I? ? Image quality is very good. ?Lou On Apr 13, 2014, at 2:49 PM, AmericoWatkins@... wrote:
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Re: OTA upgrade advice wanted
开云体育Ian,
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I do exactly the same thing re focusing.? To maintain the critical
distance of 146 mm I have attached a drinking straw of the correct length to the
focal reducer plane and rack the moonlite in until this separation is reached
focus as best I can with the native focuser and then lock the mirrors and fine
tune with the moonlite.? Seems to work fine during the course of an
evening.? I use maxim to try and get a fine auto focus.? I have more
trouble with that than the actual mechanical side of things.
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Cheers Eric
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In a message dated 13/04/2014 16:26:36 GMT Daylight Time,
cosmoimager@... writes:
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Re: OTA upgrade advice wanted
I had the same path going from C11 to 14" Edge. Decided from the get go to do away with trying to focus with the main mirror. I crudely focus using the focus knob, lock the mirror and forget it. Then I fine-focus using my Moonlite focuser. Works beautifully. Also, I use 0.7x reducer, no issues. Exceptionally flat field. For now I use the 14" only with the reducer. May go to Hyperstar later on.
Ian |
Lou Halikman