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PaulE54

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About PaulE54

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    Nebula

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  • Location
    NW UK
  1. That's really astonishingly good. Looking forward to seeing more from this setup. Paul E
  2. Well you learn something every day...i never knew PHD2 log viewer could do that. If it helps, I've just done the frequency analysis for one of my guide logs and mine is worse than yours! I've got a 200sec peak of 1 arcsec, a 400sec peak of 1.7 arcsec, and a 600sec peak of 2 arcsec. However if you expand the X axis at the bottom of the plot, each peak is many 10s of seconds wide, with quite a gentle rise and fall, so I think guiding is just sorting them out. Hope this helps - clear skies! Paul
  3. One thought - you do have the scope and counterweights fitted, and the mount in balance in RA and Dec, don't you? A badly unbalanced mount might do that...otherwise, I'd be phoning the dealer. Hope you get it sorted. Paul
  4. The magnitude of the 200sec and 400sec spikes you are getting is tiny compared to the magnitude of your dithers. When I look at your log in PHD log viewer I can't see the spikes as they're dwarfed by the dither spikes. What software are you using to produce the first graph? If it's something free I'll process some of my old guide logs from my CEM40 through it, to see if I have similar spikes. I believe 400 secs is the RA worm period for the CEM40. Overall your guide RMS as reported by PHD log viewer (which ignores the dither moves) looks about the same as I would get on an average night. I do see overall guide RMS of around 0.5RMS from my CEM40 with a 9kg load on (rare) nights of good seeing. I think in typical UK suburban locations you'll find the skies not the mount are the limiting factor. Cheers Paul
  5. Hi, I've got a CEM40 (non-EC) which I've had since Nov and I'm well pleased with it. Only a couple of minor teething problems, quickly sorted. I use it with an RC6, motor focuser, ASi294 and a ZWO guidescope with ASI290mini - so around a 9kg load. It will happily guide at 0.5-0.6RMS when seeing is good (rarely, here near Manchester). Recommended. Paul
  6. Well you learn something every day! I'll try that "search zero", sounds like it could be useful. Might give me more accurate first slews. Cheers Paul
  7. No I do actually take it down, and set up for each session. However this is from outside the house to inside and back again, so I don't put the mount in its case. My workflow at the end of each night is that I park the mount in zero position. Then I detach all the cables from mount to scope and detach the scope, carry that inside. Then remove tripod spreader and all data and power cables from house to mount. Then remove counterweights. Finally carry bare mount parked at zero into house. Reverse when setting up. But yes, in your case I would reset zero position at the start of each night. Clear skies Paul
  8. I use my CEM40 for imaging. So I don't set or clear alignment points, I just plate solve. I'd agree with all the points above. I'd also add in answer to your third point that I use the "goto zero position" at the end of each night before I pack up. You either have to do this, or "set zero position" at the start of each night with the mount physically in the zero position. What you MUST NOT do, which is also not explained except very indirectly in the manual, is to turn the mount off with it not in zero position, return it to zero by unlocking both axes & physically moving the mount, and then start imaging on the next night without performing a set zero. The mount remembers where it was when unpowered. Life will get very confusing. You will give yourself a nasty scare. Paul
  9. No worries and hope that we both get some clear skies. Enjoy the HEQ5! Paul
  10. Yes, I'm using ascom and a Win 10 Pro laptop. I control my sessions using APT / PHD2. The only issue I've noticed is that on first attempt to use the iPolar it sometimes hangs, but I just close it down and restart when that happens. It always connects ok 2nd time. Oh yes - and always park the mount to zero position at the end of the night. Don't turn it off and then move it to zero manually. It remembers where it was when powered off, so if you move the axes while unpowered, bad things happen next time you turn it on. Wonder how I know that? :-). Once you have a workflow sorted and stick to it, life is easy and simple. Meridian flip functionality works well also. Good luck Paul
  11. Hi. I have a CEM40 (nonEC) and I image with an RC6 + guidescope, main and guidecams, motor focuser - so slightly over 8kg. I do use 2 counterweights. I could get away with one at the end of the shaft (just) but I prefer to use 2 closer in. EQ5 counterweights fit the CEM40 shaft a treat :-). My guidescope focal length is 280mm with an ASI290mini as a guidescope. I use PHD2 to guide and on rare good nights (still air and good seeing) the combo will do 0.5arcsec RMS guiding for hours at a stretch. On more typical nights (average seeing and wind gusts) it will still stay around 0.7 - 0.8 arcsec. I set up and take down each night and the iPolar makes it super easy to get good PA quickly, which obviously helps the guiding. Let me know if you need any more info. Paul
  12. At last some clear skies in Manchester, got 3.5 hrs on M81 and M82 the other night. 294MC pro on an RC6, stacked in DSS and processed in StarTools. C&C welcomed. Paul
  13. Got a couple of hours in last night. Re-used the same iPolar calibration as last time (centre reported as X=488.7, Y=613.7) and again polar alignment was super easy and PHD2 log viewer reports PA error of 0.9 arcmins. So far so good. The guiding was not great, but I think that's more down to suburban rubbish seeing than anything the mount is doing. Paul
  14. Interesting. I hope to be imaging again tonight so I'll see how the previous calibration holds up when I re-use it. Did hear back from iOptron support, who advised always moving mount by motors not by hand when calibrating - sounds like you're doing this though - and said they would investigate whether the software had a bug. I spent most of my career working with software and it does feel like an "undocumented feature" to me..:-) Paul
  15. Yes, very curious. Although the current manual only describes two position calibration, the software still supports (and seems from my limited experience to work much better with) 3 position calibration. Ah well - looks like it is going to be well into next week before I get a chance to do any more imaging. Astrophotography in NW England is not for the impatient! Paul
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