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Found 22 results

  1. I've never had any success with my C9.25 when trying to get DSO's. I've seen images other people have taken and they have good round stars. I can never get these. I've tried collimating the best that I possibly can, and adding the Celestron f/6.3 focal reducer but I still can't get round stars. I could understand it if the stars at the edges had comma, but the stars near the centre are showing comma too. I've changed my back focus both in and out to no real difference, I'm just wondering what I'm doing wrong? I took the two attached images last night. One shows my out of focus star from the camera, and the other image shows an integration of 120 x30 sec subs of M63 Sunflower Galaxy. The camera is an ASI 1600mm Pro. These are both full frame, not cropped. When I've plate solved the individual frames for M63 they give a focal length of 1483mm. 1480mm would be f6.3 on this scope, which the focal reducer is supposed to give indicating my back focus spacing is about correct. One thing I have noticed is that on the focus star the rings are concentric and clean, but the small reflections inside the smaller ring are not central. Is this normal for an SCT? I'd have thought the central reflections would be centred too. I've wondered if the star comma was down to guiding errors, but would a 30 sec sub-frame show this much error? Incidentally, my guiding last night was the best I've ever had and I don't think it was down the guiding. When I use my refractor (although shorter focal length) the stars are perfectly round with this mount - NEQ6. A few years ago I removed the secondary mirror to remove a large dark mark from it which was obscuring my views (it was a fleck of black paint from the inside of the tube). When I removed the secondary, I accidentally rotated it when unscrewing. Would this make a difference? I know that the corrector plate shouldn't be rotated, and wondered is it was the same with the secondary? I've searched online but can't find an answer to that. I love this scope, but hardly use it nowadays because of the image quality. Hope someone can offer some helpful advise. Thanks
  2. Looking at flocking my C9.25 and need to remove the corrector plate and secondary. Simple question, how do you remove the corrector when there are 2 lugs in the way that the front cover use? I can't see how to get the corrector ring / corrector past out without removing them, they look like they are part of the support ring and not added after. Photo will hopefully explain this better.
  3. MINE! ALL MINE!! The Optical Array Left to Right: ED80 Baader Sky Surfer V ED127 Teleoptics Ercole Mount, Orion SkyView Pro Extension, Celestron AVX 2" Steel Tripod C9.25 SCT Note the correct use of the eyepiece tray and the mandatory Bluetooth speaker upgrade. This is the CORRECT way to do visual
  4. Jupiter from the 8th of April 2017. 6 x 2 minute avi (50% of 3000 frames each) derotated in Winjupos. C9.25 with ZWO ASI 224MC and ASH ADC.
  5. todd8137


    Hi all was out last night the 9th and was just viewing around 21:30 seeing was brill so a bit of moon as Jupiter was bounce ing all over the place try in to get focus with the rgb was terrible , That said I pointed at the moon ,and the boil was evident and I ran a few test vids could not get tight focus Here's the kit C9.25" sct Dmk 21 mono Ir 740mn pass filter Cgem on pier 30fps Average 1200 frames best 90% stacked
  6. I'm hoping that the sky will finally clear and reveal some stars sometime soon (fingers crossed) and I'm considering buying a long exposure CCD camera for my scope. I was wondering if anyone could make a recommendation or three? I have a C9.25 ota, and I'm looking at paying up to 1k, but hopefully less if I don't need spend all that!! What things should I consider when looking for a camera? I know that the C9.25 isn't ideal for astro being f/10, but wondered if anyone had achieved decent results.
  7. Celestron C9.25 OTA with ADM Losmandy dovetail Starbright coatings Everything in very good optical and mechanical condition Cosmetically, there are the usual few small scratches on the paintwork, but no significant damage. ADM Losmandy dovetail was £84 new 18 months ago Reason for sale is recent upgrade of OTA. Collection from Worcester, or Kelling Heath or SGL star parties, or could possibly meet halfway. £595
  8. ***Updated with individual prices*** I purchased this early this year but just haven't been using it. A combination of other stuff going on and just generally bad timing on the 3 good nights we have had this year means I have not been able to get into using it in the way I had hoped. And I don't see it getting any better, so seems sensible to move it one to someone who can use it more effectively while I concentrate on broadband imaging with my ED80. So, I have the XLT Fastar Compatible OTA on a Vixen dovetail with the 6x30 finder, 1.25" visual back and 25mm EP. I also got a Skywatcher SCT focuser to help with mirror flop for imaging. Also Bahtinov Mask And homemade Sun Filter and Dew/Light shield that i can throw in if anyone wants them. OTA is in perfect condition with the usual expected scratches on the dovetail, but otherwise in great condition. It is a fantastic scope giving great views, I am just not going to be able to use it much. £875 for the OTA £75 for the Focuser £15 Bahtinov Mask £950 for the lot or make me an offer! Collection for OTA preferred as this is a bulky, fragile item and couriers generally will not insure such glass going through the post. I am not keen on posting, but could consider it if buyer is willing to organise themselves and take responsibility for it. I think I still have the boxes it came in. Focuser and Mask can obviously be posted. Bank transfer, paypal accepted. I'm in Gloucester.
  9. Does anyone know what the strange diffraction spikes are in this image? I know the star Alnitak is pretty bright but wasn't expecting this. I've never seen this happen before. Is it an SCT thing, or a MY SCT thing? I've seen straight diffraction spikes, but never curved. Is there anything I can do to stop this? Could it be a collimation issue? I did check before I started imaging, but thought everything looked ok. My scope is a Celestron C9.25 XLT, and I'm using a f/6.3 corrector/reducer with modded Canon EOS 600D. Thanks in advance
  10. This image is dedicated to everybody who has advise and encouraged me since I first started planetary imaging around 2010. Thank you! Having asked for help in 2010 to get to the "next level" I have been trying to get to that next level ever since. It has been a long journey with mostly ups and the odd down, personally I don't think I will ever be totally happy, but at the moment I am close Taken last night at around 10:30 before the clouds rolled in. The current set up of C9.25/ASI120MM, plus the all important x1.8 Barlow! 60 seconds per channel So pleased to finally to crack imaging at a focal of around FL 5100mm Res=0.15" so much more detail at this length, the jet stream out of the way obviously helped! Given even better conditions I might be able to improve even a little more! Again using the focusing technique as talked about previously, I tried moving closer and then further back from the laptop screen last night and it really is startling the difference in detail visible from a distance.
  11. What am I doing wrong to get planetary images like these attached? Or maybe I should be asking what am I actually doing right? I've tried a few times to images planets with my QHY5L-ii mono camera through the C9.25 both with and without IR/UV block filter and get the same blurred results every time. I've checked collimation, and focus using a star mask. It's pretty good really, and I know the camera works fine because I've used it to get some good lunar shots. I'm imaging thought sharpcap software and have processed the images with registax or autostakkert and get very similar results. Is there anything obvious that I'm missing?? All suggestions welcome, thanks!
  12. Hi please could anyone provide me advice about using a C9.25 for deep sky imaging? I currently have a SW 200P (F5) reflector and a SQ Equinox 80 (F6.25) refractor and an EQ6. I have been guiding reasonably successfully using a finder guider (QHY5). I'm thinking of changing the 200P to an C9.25 (f10) Schmidt Cassegrain (with a reducer (F6.3)) for a different and hopefully positive experience. I intend to image planets and DSOs and also general observing. I thinking of setting up my scopes permanently using a dual mounting bar so that I can have both wide field short focal length views and narrow long focal length views. I assume that this is sensible but if not please let me know. I see 3 opions open to me Use the C9.25 with a reducer and a QHY5 finder guider - has anyone have any success with the approach? Guide with using a combination of the equinox and the QHY5, as both the EQ80 and C9.25 would be mounted on the dual bar. I expect this would be a bit fiddly though as I would need to move the camera when switching between imaging scopes Buy an OAG and attach the QHY5 (if this is even possible). This is may least favourite as its additional cost and I have no experience with OAG, but if it mans more time actually imaging that kicking and shouting at my gear then Ill continue saving. Any advice would be very much appreciated before I waste any money and time, as both are always scarce. Thanks for looking Ian
  13. Hi all seeing was not not great but needed my moon fix,x2 barlow dmk21 mono average 1000 frames at 30fps average 400 stacked .forgot to name some craters because i forgot there names seeing rubbish but another not bad night pat
  14. Thought I'd take a quick snap of the moon while experimenting with my "new" C9.25 I got myself after graduating University, haven't had much time to use it as I'm still tinkering with the Quattro.. C9.25 on EQ6 1/100s ISO100 Canon 1000D full spectrum and an F/6.3 reducer to fit the whole moon in the frame. Modified to greyscale to fix colour and an unsharp mask to bring out a bit more detail in craters. Will test how the QHY5II performs next time and perhaps make a mosaic. Thanks for looking, Carl
  15. Jupiter from the 8th of April 2017. 6 x 2 minute avi (50% of 3000 frames each) derotated in Winjupos. C9.25 with ZWO ASI 224MC and ASH ADC.
  16. I've just picked up a second hand Celestron C9.25 tube. It comes with a screw-in mounting bracket for the 6 x 30 finder. I already have a Synta finder and a Synta-bracketed compatible finder-guider, so I’d like to replace the existing 6 x 30 finder with a Synta compatible mounting shoe. The holes on my existing Synta finder mounting shoe (see link below) are much to close together to allow me to attach the shoe to the tube with two screws. https://www.firstlightoptics.com/finders/finder-mounting-shoe.html Does anyone know of an adaptor plate that would allow me to mount a Synta finder shoe on my C9.25 tube? Thanks
  17. Hi there. I'm a planetary guy with a Meade LT6 ACF Alt/Az mounted. No problems... The issue is happened to a friend of mine with his new AVX Advance + C9.25. I have minimal experience using EQ mounted scopes. Here is what we do to setup: Level tripod with one leg pointed north.Add scope align the notches on the mount. Set latitude to our position. No polar scope so we just roughly centre Polaris through the 'hole'Perform either a 2 star alignment or use the Star Sense. After this we slew to Saturn. It's towards the left of the FOV.Now we use ASPA. It tells us we have a slight error. We choose a star and it slews to it. The slews to the place it ought to be if polar alignment was correct.We are now supposed to adjust the Alt and AZ of the mount to centre the star, in first NS and EW. This is where we seem to stuggle. I manage to centre the first and second part. Then the scope loses the plot. Alignment reads XXX XXX. Trying to slew to Saturn again will move the scope into very peculiar positions! Looking at the latitude dial now reads something completely different to our actually location.... Any obvious errors that I am making? Thanks for any input. Skips
  18. This question has probably been answered a dozen times, but I haven't found the answer either here or on the manufacturers website. Does anybody know the physical dimensions of a Skywatcher ST80 telescope? I'm thinking of getting one to use as a guidescope for my C9.25, and don't really want a guidescope thats going to be longer than the main scope. Also, can you tell me what size tube rings this scope will need for attaching it? I've seen the ADM mini dovetail system for attaching the scope on the FLO webiste. Are there any better ways of attaching a guidescope to an C9.25 telescope? Many thanks for your assistance.
  19. Almost certainly my last Saturn attempt this year .. just skirting my rooftop now (oh for a south facing garden with fields beyond !) Switched back to the C9.25 for convenience and results very similar to 10" OO Newt considering the poorer seeing on this imaging run resulting in very noisy captures. C9.25 F25, DBK21 618, IR image using SPC 618 modded, AS2, Reg 6 Cheers, Alan
  20. http://www.celestron.com/astronomy/celestron-radial-guider.html I've been offered one of these second hand and wondered of anyone has one, or knows if it's compatible with my setup? I have a Celestron C9.25, Celestron f6.3 focal reducer, Celestron SCT T-adapter with T-ring, and Canon EOS 600D DSLR camera. I'm new to imaging, and wondered what other peoples opinions are before I agree to buy it. I've read a few posts on here that say the distance between the DSLR sensor and the focal reducer is critical, and should be 55mm (I might have this totally wrong). Is it really that critical? and does this OAG setup work with my scope? I know that they're all made by Celestrion, but I don't know if that alone makes everything compatible. Thanks for your opinions, and help
  21. Hi all budding astrophotographers, I recently acquired a C9.25 and after a few days I had my first clear night (moon rising). I bought a Celestron f6.3 reducer which I connected after removing the 2" back, then connected my Canon 1100d DLSR camera via a T-tring. Many of the central stars seem sufficiently round in shape but I was surprised to find so many stretched stars in the corners even after the installation of the x0.63 reducer, I thought it also acted as a coma corrector. The dew shield was not perfectly sitting on the scope but I don't imagine this could be the cause. Is this coma on the corners or something else? Do you think I'm being unrealistic of my expectations when using the reducer to also flatten the image? Is it because of the unrealistic field of view from a DLSR camera on the C9.25 or perhaps I have possibly a dodgy reducer or could collimation be the source of my problem? FYI, the image is a single 5 min exposure without any processing, guided using a finder guider and using a CLS filter, EQ6 on a pier. Im pleased with the image apart from the corners due to the stretched stars. Many thanks for looking, your advice is always appreciated.
  22. I'm after a focus knob for a modern Celestron C9.25. Mostly likely will be where someone has replaced the factory focus knob with a fine focus model such as the Feathertouch.
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