jonbosley
professor emeritus
Reged: 10/19/05
Posts: 540
Loc: Texas
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Does anyone know a way of locking the mirror on a C11 without sending it off and spending $1000's?
Thanks,
Jon
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C11 XLT Celestron
Atlas Goto Mount on Concrete Pier
WO 66 SD Doublet APO Refractor
Philips SNC900NC Webcam
Faymax FC-1000m Webcam with cooling fan
Orion Star Shoot Deep-Space CCD
POD Observatory
www.whitedwarfobservatory.com
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Skywatchr
Carpal Tunnel
Reged: 06/03/06
Posts: 1538
Loc: North-Central Pa.
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Not sure what you mean? If you're shipping it, just run the focuser all the way clockwise so it pulls the mirror all the way back in the cell.
Jeff
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18" F/5 Home-Built Dob. with Mike Dudley Mirror
Highly Modified Meade DS-16 in Roll Off Roof
6" F/15 Brass w/ D&G Lens on DS-16 Mount
DS-10 10" F/4.5 Newtonian
LXD650, LX200 Classic
Orange Tube C11
DayStar 0.45 with multiple ERFs
Vixen ED80sf
11x80 Meade, 20x80 Celestron binocs (Japan Made).
Lots of Naglers and 8mm and 13mm Ethos.
Gadgets and parts everywhere.
And a Wife that loves it as much as me!
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DesertRat
sage
Reged: 06/18/06
Posts: 274
Loc: Valley of the Sun
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Jon, the only way is to take the OTA apart and install locking bolts with pads to hold up against the back of the mirror. There are several sites which cover this procedure. I do not know of anyone you could send it off too for this to be done.
Glenn
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Brandon 94mm f7, Televue TV102 f8.6; GM8
Baader Wedge & Filters, Coronado SM90/BF30
Intes Micro M715
Celestron C11 SCT + CI700 mount
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ThomasWos
member
Reged: 02/10/07
Posts: 35
Loc: Bellingham WA
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Jon,
I too have been looking for a way to lock my CPC1100 mirror down.
I have found this locking collar here for the C14, but no such animal for the C11.
Clear Skies
Tom
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CPC 1100
Wide Scan Type III 30mm
TV Nagler 17mm
Pentax XL 10.5mm
Takahashi LE 5mm
Televue 2" Everbrite Diagonal
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Steve310
newbie
Reged: 01/27/07
Posts: 1
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This may be what you are looking for: www.sciencecenter.net/hutech/misc/focuslk/index.htm
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Sirquack
super member
Reged: 05/03/08
Posts: 141
Loc: Iowa
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Thanks Steve, great first post. 
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CPC 1100 XLT
8" DIY DOB
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Jason B
Carpal Tunnel
Reged: 06/21/04
Posts: 2069
Loc: Mid-Michigan
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Welcome to CN Steve!
Jason
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Jason
Discovery 12.5" F5 PDHQ
GSO 6" F5 Newt.
Vixen 80mm F8 APO (FL80S)
Vixen GP and Astro-Tech Voyager Mounts
MX 716 and Canon Rebel XT
Volunteer Administrator for Fox Park Observatory
16" and 12" LX200's
10" Meade and Parks Dobs
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ThomasWos
member
Reged: 02/10/07
Posts: 35
Loc: Bellingham WA
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Steve,
The focuser lock may, or may not address the issuses of:
- Mirror flop as you cross the meridian?
- Loss of critical collimation with change of scope elevation?
The locking collar made by Software Bisque, (linked in my previous post), actually immobilizes the mirror and prevents these problems.
You then focus with an external focuser.
Clear Skies
Tom
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Freddy WILLEMS
scholastic sledgehammer
Reged: 11/13/05
Posts: 909
Loc: Hawaii, Honolulu
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My Primary mirror of my C 14" is locked in place with a collar, I adjusted the mirror so I can use a Moonlite focuser in the back of the SCT for Visual with diagonal and photographic work. It took a while before I had the right locking distance set, remember moving the primary mirror 1/8" or 1/4" to the front (with a washer or so ) moves the focus in the back out with inches/ feet !!!!!! It is not linear as you thing it is. I tried it many times, taking the primary out over and over again and now I have the exact position pinned down ! For now the mirror ia getting re-coated by Alcoat because I had some smudjes and fingers on it while doing so, but I will have a great scope when all is done ! See my post:
http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/2532752/page/9/view/collapsed/sb/7/o/all/fpart/1
Freddy
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Freddy
Meade 14" LX200 GPS UHTC GPS on permanent pier (Time Machine)
Celestron C 14" Peltier cooled for planetary imaging.
Meade 10" LX200 & TITAN 50:1 mount Gemini 'go to'
Meade 127 mm f/9 APO & TITAN 50:1 mount Gemini 'go to'
W/O 102 mm f/7 APO doublet
Orion 80 mm f/7 ED
DFK 21AU04.AS
ToUcam 840 II pro
Canon 10D Unmoddified
Canon 40D waiting to be modded by Hutech
And lots of eyepieces and acc.
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ThomasWos
member
Reged: 02/10/07
Posts: 35
Loc: Bellingham WA
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Freddy,
I'm not able to see how your mirror is locked. Can you point me to a picture #?
Thanks,
Tom
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CPC 1100
Wide Scan Type III 30mm
TV Nagler 17mm
Pentax XL 10.5mm
Takahashi LE 5mm
Televue 2" Everbrite Diagonal
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Freddy WILLEMS
scholastic sledgehammer
Reged: 11/13/05
Posts: 909
Loc: Hawaii, Honolulu
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Sorry I was looking at the HUTEC link... and it seems that my mirror platform indeed misses a part (threaded focus rod!) My SCT is really not an usual one and I did a lot of remodeling on it.....
In Pic #6 and # 7 you'll see a black metal ring that holds the mirror in place on the central sleeve, now in the back I have installed bolts that comes out the back of the SCT and screwed them down with a nut. Inside the tube I added 3 washers to achieve proper focus for my Moonlite focuser.
Now the whole mirror is locked in place and bolted down by the nuts on the back. It does not move at all !
I wish I had that focuser threaded rod so I could install the HUTECH divice !
I need to update with more pictures as the newly coated mirror comes back.
Freddy
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Freddy
Meade 14" LX200 GPS UHTC GPS on permanent pier (Time Machine)
Celestron C 14" Peltier cooled for planetary imaging.
Meade 10" LX200 & TITAN 50:1 mount Gemini 'go to'
Meade 127 mm f/9 APO & TITAN 50:1 mount Gemini 'go to'
W/O 102 mm f/7 APO doublet
Orion 80 mm f/7 ED
DFK 21AU04.AS
ToUcam 840 II pro
Canon 10D Unmoddified
Canon 40D waiting to be modded by Hutech
And lots of eyepieces and acc.
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jonbosley
professor emeritus
Reged: 10/19/05
Posts: 540
Loc: Texas
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Thanks for the replies.
The Mirror locks need to be ajustable to stop the focus issues Freddy had (for example once an image is located, the mirror is used to focus then locked to stop mirror flop, then small amounts of ajustment are done with the focuser).
I do know of some people who have done this themselves but there are problems, one of the main ones is a pinched mirror. So I do not really want to do this myself.
Optic Wave Laboratory (woden optics)will place locking systems on SCT's as part of their more advanced upgrade servicing but it is not cheap, I may just have to save up and smile at the wife.
Jon
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C11 XLT Celestron
Atlas Goto Mount on Concrete Pier
WO 66 SD Doublet APO Refractor
Philips SNC900NC Webcam
Faymax FC-1000m Webcam with cooling fan
Orion Star Shoot Deep-Space CCD
POD Observatory
www.whitedwarfobservatory.com
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Hal Pollner
Reged: 08/30/05
Posts: 6183
Loc: Southern California Desert
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HEY JON:
Another way, which I used after my first star party with my new CPC 1100, was to return the telescope in exchange for a new Meade 12" LX200ACF, which HAS a mirror lock, enabling the use of an inline Crayford focuser and completely eliminating primary mirror shift by locking it in any position.
In addition, there is never a cord wrap issue with the LX200 series, because the control/connection panel is always stationary with respect to azimuth rotation.
These were important considerations to me, which is why I went back to an LX200, my third!
HAL
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Edited by Hal Pollner (08/26/08 06:11 PM)
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