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Found 7 results

  1. Good afternoon all and hello from cloudy maidenhead! Recently getting back into astronomy from a few years break and have just bought a Celestron cpc 800 which i love! (i used to have a 8" Dob but it was too cumbersome to take to darker skies) Anyway as my title suggests i started\cleaning the front correction glass when i noticed the center with the collimating screws was able to rotate!? As i tried to tighten it, it kept on rotating (oh no!) This left me no choice but to remove the front glass to get inside to tighten it. I marked very carefully the exact orientation of the glass as ive heard this is matched to the main mirror and screws etc... When i removed the front end as feared the the secondary mirror was rotating also and i have no idea what position it started in! Will this just be a simple issue of re-collimating the scope or does the main and secondary mirrors need to be aligned some how? On a second note as i had the correction glass out i decided to clean both sides of it... I cleaned it very carefully and happy with the results but the glass didn't look coated in any way, just perfect clear glass. does this sound normal? Thanks for your help in advance guys Stu
  2. I'm experiencing an issue with my CPC800 which is I can only describe as an issue with slew, mount drift or backlash: After a sucessfull PA (ASPA or 3 Star Align) I get the scope to GOTO quite accurately. I use the Celestron CrossAim 12.5mm eyepiece (CCelestron CrossAim 12.5mm Illuminated Reticle Eyepiece) to align on each star as accurately as possible and this has helped enourmously with GOTO accuracy. If the GOTO target is to east of the meridian the GOTO and slew are bang-on - tracking starts when the target is at the centre of the FOV. However, if the target is on the west the slew continues past the target. To stop this I have to press the handset button opposite of the direction of slew and then the tracking starts. I'm afraid I can't describe this any better - I wish I could post a video. Please, can any explain what is going on and perhaps suggest a solution?
  3. Hi gang, I have a small issue with my CPC & need some information from other CPC owners. Basically I was having a look at the Fastar connection for Hyperstar but noticed that the whole Secondary assembly was a little loose & could be rotated on its own leaving the corrector plate securely fixed. Here’s where I made my first mistake, I lost track of the original starting position of the assembly but it didn’t end there. The only way to tighten the assembly & stop it rotating freely the corrector plate needs to be removed as the Secondary unit is tightened on the underside of the corrector. Next mistake, I forgot to mark the corrector position to aid refitting, not considering the fact that it’s position would be important on reassembly. Turns out that my corrector has no significant markings on it except in 2 places on the edge, about 45° apart are an arrow pointing to the outer face & the number 4. Through much head scratching & the use of digital calipers I think I have found the correct orientation of the corrector plate in order to reassemble but I am still stuck with not knowing the correct position of the Secondary assembly. I have read various articles that contradict each other stating that one of the 3 collimating screws should be at 12o’clock or 6o’clock. What I have noticed though is that when the outer retaining ring is unscrewed from the Secondary assembly, there is a small locating grub screw that sits within a slot on the assembly housing, see pic: a big ask I know but is it possible for other CPC owners, mine being a 9.25” if it matters, to unscrew the Secondary retaining ring & note the position, on a clock face (top of OTA as 12), of this locating slot. It would be much appreciated. Thanks I know there’s plenty of discussion pertaining to Primary & Correctors as marching sets, although from what I gather this was for earlier SCT models, plus 365 Astronomy lists the corrector as a replacement part: https://www.365astronomy.com/Celestron-C9.25-Replacement-Corrector-Plate-50984-1S.html so I’m hopeful that nowadays the matched pair issue is not relevant & ive got away with my stupid mistake. Regards.., Kirk
  4. Hi need some expert advice, I have been looking at the celestron 800 edge hd cgx. is this kit any good and can someone clarify that this is a go to mount with a hand controller capable of slewing to any object in its database (the same as celestron nextstar), if so how does the handset work around doing a meridian flip? i have also been looking at the celestron cpc 1100 gps xlt, if I fit a hyperstar to this telescope would I be able to do astrophotography with this telescope without buying the hd wedge, as I know it will make it roughly a f2.3 and I would be able to take 20 second exposures. sorry for all the questions but I know you guys are the font of all knowledge!
  5. I have a Celestron CPC 9.25 and a knocking sound began to come from the declination drive while tracking. The noise stops when slewing the drive in any speed but returns when tracking. The noise was intermittent and sometimes quite loud and so I looked online to see if this is a common problem and to find a cure. Several people reported the same fault but I couldn't find any information or images of the inner workings or how to fix it. I carried out the following three weeks ago and the knocking noise has stopped since then. To do this you will require the following items. 1 set of metric allen (hex) keys, 2 small O rings (see image) Small phillips screwdriver Lithium grease (optional) Begin by locating the hex screw on the declination clutch knob (see image) Undo this screw and turn the knob anticlockwise until it comes off the spindle. Locate the six hex bolts on the inside of the fork arm and remove them. The bottom and middle screws are the same but the top pair are longer but both different lengths. You may have to move the ota to access these. Locate the two lower hex bolts inside the bottom hand recess and loosen them but don't remove. The outer plastic cover should now come off revealing the motor assembly (see image). Look for the two small black phillips screws that secure the gearbox to a shiny silver pressed steel bracket (see image). Note that there is a gap between the bracket and gearbox and this is where the O rings will be placed. Remove one screw and slide an O ring in place, replace the screw and tighten slightly to put pressure on the O ring but not to significantly distort it. Repeat with the next screw. While the side plate is off, now would be a good time to replace the grease on the main brass worm and large cog with something suitable like lithium grease. That's it! Simply replace the cover and clutch knob and things should be quieter.
  6. For Sale: Celestron CPC 800 GPS (XLT) Telescope Comes complete with all original Celestron accessories which includes: · Heavy duty tripod · Nexstar+ hand control · 9x50 finder scope · Visual back · 1.25 inch diagonal · 40mm eyepiece · Power cable · RS-232 cable (for handset) · Manuals In addition, the sale includes: · Bobs Knobs collimation knobs (already fitted) · Astrozap Flexible Dew Shield · Celestron power tank The scope is three years old and I am the original owner. I do not have the boxes so collection preferred. I am happy to deliver up to 100 miles range or can meet up on the M6 somewhere. NOW SOLD
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