Celestron Manuals Online
Celestron C8 Serial Numbers

Removing the Optics Celestron C8 Serial Numbers

Corrector Plate

This is a 1980's-era Celestron orange C8 with stamped forks, serial number 31548. It is in excellent cosmetic and optical condition, with no signs of fungus or discoloration on the corrector, primary mirror or secondary mirror. A bit of dust and some cleaning swirls on the corrector that do not affect views. Focuser is smooth with minimal image shift. Meade LX Registry. If you own one of Meade's 2080 or 2120 series of LX telescopes (ie: LX / LX2 / LX3 / LX4 / LX5 / LX6 / LX10 / LX50 / LX100 / LX200 / etc) and would be willing to share your serial number and year of manufacture (if known), please contact me at rick@deepskies.com and I will gladly add you to this list!

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The corrector plate is held on by the frontcorrector plate ring. Depending on the age of your telescope,the screws on this ring can be Allen head or Phillip head.

Remove the screws and the retaining ring. Before actually removingthe corrector plate, check around the edge of the corrector foran engraved serial number. Use a pencil or other form of markingdevice to mark the location of this serial number on the backingring against which the corrector plate rests. This will insureyou put the corrector back in its proper orientation.

Also look to see if there are any shims between the correctorplate and the backing ring. Mark the location of these shims asyou did the serial number and make sure you know which shim goeswhere should there be more than one shim. Most of the shims Ihave seen are small pieces of paper that can easily get lost,so be careful here.

The corrector plate can be removed by grasping the front ofthe secondary mirror housing and pulling straight out from thetube assembly. It is at the moment the plate pops out of the tubethat shims will fly all over the place!

On some scopes it may be necessary to actually pry the correctorplate loose. My present C-8 is one of these. It appears the correctoris not perfectly round and after being pressed into place withthe corrector retaining ring, will not come loose by pulling thesecondary housing. I use a piece of wood - like a tongue depressoror ice cream stick - to fit into the gap between the tube walland the plate and pry the corrector GENTLY. Once it has been movedthe slightest bit, it comes out easily.

Reassemble in the reverse order. Set the shims in place andalign the serial number with the marks you have made on the backingring. Using the secondary housing as a handle, press the correctorplate gently into place. Set the retaining ring in place and replacethe screws. My procedure is to start all screws and turn eachuntil it just starts to tighten up on the retaining ring. Workopposite pairs of screws slowly tight so that the retaining ringis pressing down on the corrector plate with equal pressure aroundthe diameter. Tighten the screws finger tight and do not torquethem down! You do not want to exert any distorting pressure againstthe corrector plate, so be gentle tightening up the screws.

Main Mirror

After the corrector plate has been removed,it will be necessary to remove the focus assembly prior to pullingthe main mirror. Refer to the focus assemblydisassembly page for how to instructions on pulling the focuser.

Once the corrector and focuser are removed, tip the scope upwardsso the main mirror rests at the bottom of the telescope tube.Examine the end of the central tube and you will see a large splitring clip. Remove this clip and the main mirror can be removedfrom the tube by grasping the mirror mount assembly by the centralhub and pulling the whole mirror assembly out of the front ofthe tube. This hub assembly is secured to the mirror at the factoryand it is not recommended you take it apart. Recollimating thescope will probably require returning the instrument to the factoryif you remove the mirror itself from the mirror hub assembly.

Secondary Mirror

Celestron Manuals Online

The secondary mirror is mounted in a plasticor aluminum shell at the center of the corrector plate. OlderCelestrons used a center screw to hold the secondary mirror inplace. The newer models use the collimation screws themselvesto hold the mirror. Either unscrew the central screw or the collimationscrews to disassemble the secondary.

Celestron C8 Serial Numbers

When reassembling the secondary, you will find an index lineon the back of the secondary. This index line must point to thecenter of the serial number on the corrector plate.