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About kens

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    Star Forming
  • Birthday 08/05/61

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    Deep sky, fly fishing, cycling
  • Location
    Melbourne, Australia
  1. Get your calibration sorted. Please post your guide log from Documents\PHD2
  2. You'll never get good guiding without a good calibration. You've got serious issues there but it's hard to say more without seeing the actual log file.
  3. You'll find that for deep sky astrophotography your main piece of equipment is the mount as that will have the biggest contribution to your image quality. Do plenty of research if you wish to spend your hard earned wisely
  4. Are you using dev3? If so can you send me the debug log so I can see the cause of the crash. The error handling in that version was improved over the earlier release so if its crashing there's something I missed. Most likely the short focal length means a much bigger rotation is needed so it could be you did not rotate the mount far enough for the algorithm to detect an arc. dev3 also provides the ability to pan the helper display and rotate it to match the view with a manual mount. Where did you want to be able to zoom in? Is that the help display or the main display? The helper display should match the FOV you see on the main display so zooming does not make sense there. On the main display it might be nice to zoom in on the corrections needed but I'll need to see if that's possible without impacting the guiding algorithm. But in the main, if you need to zoom in, why use a 25mm guide scope? dev4 should be out soon - it has some bug fixes that affect the helper display.
  5. Thanks for the feedback and I'm very glad it works for you. For now I would still regard drift alignment as the more accurate method . But if the two give similar results I think you cn be pretty sure you have a good alignment. The main thing to watch for is whether you get the central point consistently in the same place as that is the calculation most subject to the vagaries of the mount and conditions; and everything else rides on that. With these latest changes I am feeling more confident that it will work for most people in the northern hemisphere
  6. In dev3 you can double click on the helper display to centre that point and thereby pan around. e.g if you double click on Polaris it will centre it. There's also a couple of bugs I've just submited fixes for: one is inversion of the image caused by (lack of) a side of pier adjustment and the other is an obscure bug affecting manual mode.
  7. Other things to look at are the worm end float and make sure you have not over tightened the collar on the counterweight shaft. Check out Astrobabys guide: http://www.astro-baby.com/EQ6 rebuild guide/EQ6 Strip Down Home.htm
  8. Take your time. Getting the right mount is critical. The principle difference among the ones you mentioned is their weight carrying capacity. The Star Adventuer has a max capacity of 5kg, the HEQ5 around 11kg an the NEQ6 18kg. That capacity covers the OTA, camera, filter wheel, guide scope, guide cam and anything else you plan to load onto the mount. The 200PDS is a big OTA and should really be mounted on an NEQ6 or larger for imaging. You may find it better to start with a smaller setup first.
  9. PHD vs PHD2

    Most likely because the calibration steps are too small. Check you've got the right focal length, pixel size and guide rate in the calibration step calculator and make sure you are not calibrating at too high a declination.

    You cannot use a normal USB to RS232 cable. The mount does not run on RS232 but instead on TTL which among other things is a lower voltage. The EQDIR cable converts down to TTL. You must connect an RS232 cable via the hand controller in PC Direct mode.
  11. Help. Mount RA Issues (AZEQ6)

    PEMPro Log Viewer is a useful diagnostic tool. http://www.siriusimaging.com/PEMProV3/PEMProLogViewer_Setup_1.4.0.0.exe And it reads PHD2 log files better than PECprep. In additon it has an option to view the graph with the guide corrections restored - equivalent to an unguided graph. All the EQ6 mounts are not easily corrected for PEC as the periods of the various gears are not harmonics of the worm so they produce a varying PE waveform. Its quite common to find that in addition to the 478 second worm period there is also a 122 second period. The belt drives help mitigate the latter.
  12. I just submitted a set of changes including a bug fix. In some situations the code was calculating a negative distance from the pole which affected the display of corrections. Should be available in the next dev release. Tonight I was able to do some extensive testing at different focal lengths and a range of distances from the pole and the issue no longer appears, in the southern hemisphere at least. Attached example is at 70mm focal length. Initially the camera was aligned several degrees away from the main OTA and the offset was clearly indicated on the display. A few slews in declination got the camera FOV aligned to where the mount was pointing. The FOV is about 3 deg x 2 deg. You can see some of the cosmetic changes I've made. The circles showing where th various reference stars belong are larger and are now labelled. The lines a dimmer so they do not hide the stars.You can also see that most stars are very close to their circles. I had chosen star C from the list but the one I selected on the display is anoher star not on the list. The true star C is just outside its circle.
  13. Without polar alignment your target will drift in decliination. This is a problem for unguided imaging. Even with guided imaging, a poor polar alignment will cause field rotation leading to traling stars.
  14. Thanks for the feedback. I was expecting it to be more difficult in the NH. Next time if you can get a screen shot showing the StaticPA window and the main phd2 display I can see if there is a reason for the misalignment and fix it.
  15. Alt is red. The overlay is static but the centre of rotation does not move as you adjust. What you are doing is moving the celestial pole to coincide with the centre of rotation. One you've made your adjustments you could slew in dec to recentre then rerun the process from the start to check your alignment if you want. I'm most interested to hear about the choices for reference stars and how easy or otherwise to find them