开云体育

Okay so I went out Saturday night with halfway decent seeing, no wind, transparency not great.
Mount was adjusted according to videos.
Was tweaking the little screw next to the spring screw, ended up about half to three quarters a turn extra, meshing the worm tighter.
Ran guiding assist in PHD2 then did a quick four worm PEMPro curved program into the mount.

WOW! I think I have this thing dialed in pretty good now. Except for the random DEC excursions.
Attached are some PHD2 screenshots showing the guiding and the DEC excursions.
Also log files from PEMPro and PHD2.
I couldn't believe when I actually had sub .3 guiding for a little while.

I don't know if it is a software issue are not, but when I would have the guiding go bad, I would stop PHD2 guiding, quickly restart,
in the guiding would resume perfectly again. Kind of strange.

Guiding was pretty great all night except when I hit the deck excursions, which you can see jacked up the PHD2 to the .5 - .6 range.
Long PHD2 runs were 19, 20, 23, 25, 26. You can see it was guiding great and then it hit the DEC excursions.
Please excuse the choppy PHD2 log, I was working on camera tilt first.? It's nice to be able to do actual imaging.

Attached are also a quick picture of M13. 46 minutes of 30 second subs.
Iris Nebula total of two hours and 10 minutes mostly 30 subs.
Then I decided to experiment and did a quick 10 minute single sub of the Iris Nebula.
Once I get rid of the DEC excursions it will be nice to be able to do 5 minutes subs.
I was actually also able to incorporate dithering after building confidence in seeing the guiding.
Previously dithering, the mount would never settle down after a dither.

So with the logs posted, I would be interesting to hear back whether it could possibly be the worm too tight,
dirt somewhere or some other recognizable problem. In the PHD2 logs, I can't seem to find any repeatable time
for the excursions but some of them do look like they have the same pattern i.e. shape.

Here is my equipment profile:

Orion EON 115mm Triplet Refractor 805 focal length F/7 -? Feather Touch Focuser
Losmandy G11G
QHY247c? Pegasus Focus Cube V2
QHY-Medium OAG? ZWO asi174mm
GPS, Ioptron Ipolar
2X 12v Deep Cycle Batteries? Pure Sine Wave Inverter
Lenovo Mini PC M710Q 16GB RAM 256GB SSD W10P with a router connecting Via Ethernet to laptop in toasty warm car
SharpCap Pro, NINA, Pixinsight, PHD2, DSS, Photoshop, PEMPro V3.

Thank you in advance for all the help.

Sorry, forgot how great 1990s technology Email lists are so here is a link to the full size photos.

David,

Without even looking at your logs, it appears you are on the right path. For a scope of this focal length, this guiding should be more than good. Now you may be in the way of just tweaking PHD2 settings for best performance. You probably have the PHD2 troubleshooting guide already.? As far as Dec going off sometimes you might be able to attribute to atmospheric turbulence, increasing exposure to 1.5 or 2 may help. My guiding error can range from 1.0 at 30 degrees altitude to 0.5 or less at the zenith on the same night. My Dec balance is always camera heavy. If you are too well balanced you could be bouncing back and forth between gear faces and having some Dec oscillations. The majority of your scatter plots are nicely centered, and your stars are pretty round as far as I can see. You seem to be set for doing some nice imaging going forward. Image quality is more satisfying to me than chasing numerical perfections :).

Good luck!??

Your screen shots have too large a scale on the guiding plots, so it's hard to make out anything.
Based on the guide logs, you have too much backlash compensation

Fantastic results David, congratulations, great images.? ?I will need to try PHD2 next time and see if that is better than Ekos where I got to about 0.6" total RMS last time.? This is with a 12" Newt of course, over 50 lbs total.? ?I guess what one can achieve also depends heavily on the seeing.