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Found 36 results

  1. Aenima

    ngc7000red ha -

    From the album: CCD venture

    A h-alpha shot of the Wall section of NGC7000 aka north america nebula. ED80 - ATK16HR - Ha clip filter - EQ6 - finderguider 9x50mm PhD2 - photoshop - DSS.

    © 2016JayBird

  2. Hi After selling all my equipment some time ago I have now started the hobby again with a C925 on an AVX mount. Last night was my first chance to try out the Starsense Accessory, which seemed to work quite well. However I was a bit concerned that when doing the calibration for the SSA camera position and during the Polar Alignment routine the tracking seemed very jerky at higher magnifications. The video I took of Jupiter after alignment did not seem to show this (although poor in all other ways) so I don't know if the jerkiness is something to do with tracking mode used by the SSA handset during alignment. It could also be a mount fault or poor balance but I would expect that to show in the video? Has anyone else experienced this? Thanks Barry
  3. This is more of a story about last nights efforts than a cry for help. I went out at ten to focus the OAG on the scope fitted with a lodestar and align the guiding axis to the telescope. The ultimate aim was to calibrate the PEC on the SS2K to start to take decent pictures with the mount. It was a glorious night. But my lodestar seems to have grown duff bright pixels by the dozen over summer. Even using full autocalibration in Maxim didn't seem to remove them. So I created a bad pixel map and applied it to my auto calibration groups but still with no effect. Meanwhile I soldiered on, using a brighter star in the OAG to focus and align axiis on. That done, I discovered there seemed to be a reflection from the bright star that Maxim insisted trying to guide on. It turned up on the row of the first bright star image and even after subsequent images when the star clearly moved according to movement calibration requests, the false star remained fixed and caused maxim to fail the tracking calibration. An hour and a half of this I tried, with various combinations of bin ratios, exposure times, star in different quadrants of the CCD and all with no success until I put the star in the top left quadrant and then calibration success! You might think that was it, I was motoring, since Maxim was now seeing the star. But no. Maxim could calibrate on the star but reported 'star faded' when trying to use it a guide star, consistently and persistently. Apparently it needs a different type of star to guide on. There were no others. So half an hour later I gave up with that and went to PhD2. It had support for the Lodestar and for the ZWI so I persevered with the Lodestar. It could even see the star Maxim refused to guide on and I could use it to calibrate the movement of the scope for Phd to guide with. I did get a 'ratio difference alert since my motion was very assymetric 'L' shaped but it did calibrate so on I went. Now I could calibrate my PEC!. Several times I achieved this, repeating it starting at different times on the worm since the ss2K will even out the measured with the already recorded. And then Puff! the star had gone - nothing to guide on and the duff pixels were there polluting the image as before. Where did it go ? The sky was still clear and the dome slot was right there where the scope needed it to be. Now I tried a few exposures at 3mins just to get a feel on what quality had resulted from all my efforts. Its an 8" 1800mm so its was optimistic but the evening conspired further - the camera intervalometer battery was flat. Not to be deterred I dug out the spare. That'll teach it. But that one has a duff lead that causes the camera to turn off occasionally and it wanted to play. It was now 1.30, I was freezing and not thinking about swapping batteries so it was time to hit the sack. Only up at 6 for work. I love these succesful evenings. Gotta have more of them. Better luck to every one else, and if you have a solution to the Maxim problem I'm interested. Mike
  4. Hi all! Yesterday I was out taking a few pics of M56 and M71 (no nebulas or galaxies, because the moon is still quite full). This was the first time I tried my new coma corrector, which I think works fine. One RAW sub: A few problems, though. As you can see from the above RAW example, there is no coma anymore, but all stars are kind of triangular in shape. Is this due to collimation error, ie warping the primary by tightening too much? I tracked (unguided) using also PEC... Second problem. On RAW sub that wasn't so good...: These subs are frequent, one in every 4, on average... I'm guessing my HEQ5 is old and not too precise anymore... Or could it be something else still? Here is the stack of the good subs (no post production), to show the beneficial effect of the coma corrector again: Ideas? Gerhard.
  5. Good Morning, Does any of the guiding softwares out there auto-correct a sync scan auto dob, with the use of a guide scope? The main use would be to to keep Planets in view so several runs of imaging them can be done in a session. I notice my XT8G does drift out of view ever 10mins at 250x. If I wanted to take gifs or many shots of something I'd need it to stay more dead on for longer than that. I have gotten as close to perfect gps coordinates, time to the second etc. Thanks Enrico
  6. I've just about got used to operating my EQ3-2 by its flexible manual control knobs but I'm increasingly aware of the wobble I introduce each time I adjust them them. So I would seem to be a natural candidate for a set of SW motors. However I don't want to spend £90+ for some 6 volt motors which have a reputation for blowing up hand controls and eating up batteries. I have read the AstroEQ (excellent piece of work by Tom Carpenter!) thread in this DIY section which offers a very attractive pathway towards full control and go-to tracking of the mount. I am therefore particularly interested in avoiding the SW motor drives and making use of some stepper motors with home constructed brackets as a first stage modification. But is there any way I could do this and control the motors in a semi-manual way without needing always to use a laptop running EQMOD etc? In other words, for instance, could a version of AstroEQ be interfaced with a manual control box (especially IR linked) driving stepper motors and offering simple object tracking? I started this as a new topic because I have some difficulty navigating within the AstroEQ 20+ page thread and don't want to distract.
  7. Hi all here's my odd thought,balance now I balance the sct with the weights facing east and the scope on the left facing west But when I image the moon or Jupiter the position of the weights is over to the west and the tube is on the right facing east , So should I balance the scope with the weighs to the west ,has that's the side they will be on when I do image with a dnk21 camera tracking and PA are very good ,align master, Pat
  8. Guys and Gals - Really hoping for some help from the imaging gurus and mount doctors here. Lucas has been helping me with my Mesu 200, which arrived with what I believe was an out of spec RA servo/encoder. It's one of the latest versions with magnetic motor encoders rather than optical. Historically, mag encoders have never been as accurate as optical (although they are normally more reliable), and typically they're not well suited to being on the end of an electromagnetic servomotor, but he re-assured me that no-one else had reported problems. My initial tracking graphs (PHD into PECPrep, 400mm ST80 into QHY5) revealed a 'fast' periodic error, going from around +2 to -2 arcsecs every 21 seconds (this is twice the fundamental motor rotation period). Not what I hoped for. Here it is again with a little Low Pass filtering: Now Lucas sent me one of the original optical encoders, which I have fitted and I believe it has resolved this fault. Here is the new raw tracking plot: I do still see a repeating PE, but it now has a 42s period, which makes more sense. It is also pretty small, in the region of 0.7 arc seconds pk-pk, but it is definitely a repetitive mechanical product. Here it is again with the same Low Pass filtering: Most of you will probably say, "Well, the seeing will be worse than that, so why worry". And I agree to a point, but I would sooner just suffer the seeing, if possible, than the seeing combined with a PE which repeats every 42s. I will be guiding anyway of course. Also, everyone who reviews the Mesu mentions that it only has a very small and very slow tracking error, with it going gently from -2 to +2 in around 300+ seconds. Even the tracking curve on the Mesu website shows this: If my mount is the 'norm', why doesn't the Mesu PE plot show a 0.7 arc second ripple superimposed on the curve? When Bisque and AP quote PE's of 7 arcsec or 3 arcsec, do they also have this faster ripple superimposed on top (I mean faster PE components - I know any real world test using star to track will show random seeing noise too)? Does anyone's Mesu 200 produce a PE curve which, without massive low pass filtering, looks like their graph on the website? If Olly or Yves see this - does your mount do this? Does it produce those fantastic images anyway? Can anyone tell me if I'm going mad? Not many folk seem to post raw PE curves, some have a huge amount of filtering applied, which makes it hard to know what to expect. Or tolerate. I know Lucas will replace my mount if I ask him - he has been great throughout, but he gives me the impression that they will all have some level of this 42-second Periodic Error. On a mechanical level, this makes sense, but I did a huge amount of research before I bought this mount, and no-one mentioned a 42s PE. If you made it this far - thanks for reading! Any advice appreciated. Jack
  9. jimao22

    IC 63

    Hi, Last night I made 22 exposures 10 min each to Ghost Nebula (IC 63) using Ha filter (Baader 7nm). The weather was perfect and the mount worked as a dream, best tracking i had ever. Acquisition, guiding, stacking, calibrating in MaximDL, focusing in FocusMax and final processing (levels, curves, unsharp mask, reduce noise) with Photoshop PS2. Set-up used - MN190 on EQ6/EQMOD, ATIK 314L+ mono plus True-Tech filter wheel, guided by finder-guider with SSAG, motofocuser controlled by SELETEK.
  10. Hi all, Tonight I was attempting to image Saturn, but eventually Saturn faded away sidewise and I was unable to follow the planet in the RA axis. I then noticed that the box of the DEC motor was hitting the RA knob and wouldn't let it move any further! This basically ruined my image session (the seeing was the best ever, so crispy and detailed regardless of the moon, the roofs and the LP!) but I was stuck in a pretty narrow balcony and wasn't easy to try anything else. Is throwing away the DEC drive a good work around? I really hope to get another clear night to image Saturn before she sinks in the horizon for a good while! Thanks in advance for any tip! Clear Skies Riky
  11. Pardon my ignorance in the matter, but I was wondering if I could get some tips as to what I would need if I were to buy either HEQ5 SynTrek or similar mounts. Not sure if I would upgrade my 6" very soon, maybe to an 8" in the future.. Maybe I'd go for a NEQ6. But anyway.. Lets leave guiding out of the equation for now, what would I need to be able to track? Do I need some sort of USB > ST4 cable and a laptop? Or is the SynGuider a better option? If I'm leaving stuff out, please let me know, cause I have no clue as of yet. Oh, and I probably need some heavy batteries as well. How do you hook that up by the way? Lots of question, hoping for lots of good answers. Which I know I'll get from you magificent people Cheers. - Ken B.
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