Quote:
Originally Posted by Dilsh
Wow. Stopped checking this thread as no one had replied.
Martin, the reason why I asked is my average RMS is around 1.0 in my bortle 7 backyard. I am now shooting with the 925 edgeHD so was hoping for better than that. You are very kind about my images but I can see on my curves that there is considerable backlash on the RA. Also during calibration, it takes alot of steps to calibrate and I am wondering if that is also a problem with the mount. I dunno, wanted to get the best out of the eq6r pro before the "new mount" itch started.
I also get the idea of 'if it ain't broke, don't fix it"
Cheers,
Dilshan
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A couple of things …
Are you using an OAG or guide scope ? Hopefully OAG for such a long focal length scope.
What guide camera ? Ideally your main scope / guide scope image scale ratio should be around 4:1 or less if possible
Are you using PHD2 to guide ?
If so , next session use the Guide Assistant to check backlash and polar alignment values
In regard to considerable Ra backlash you can check this with the rig in the home or parked position and clutches locked. Just hold the scope and try to feel any micro movement back and forward in Ra as you apply a little bit of pressure in Ra rotation back and forth.Usually you can pick it up if it’s there, I did on both my EQ6-R rigs
You can also check your motor drive belts in Dec and Ra for any excessive deflection. The small inspection plates with 3 fixing screws are visible on the mount.Check to see if drive belt deflection at a central point between pulleys is no more than say 3 to 4mm ( use a ruler or small piece of cardboard with mm markings to check )
Ra is fairly easy to fix but Dec is definitely harder
Are you balanced “East heavy” with your rig , this helps Ra as well even with belt driven mounts. All my mounts are balanced slightly east heavy
Generally an adjustment on the worms , belts and good balance on these EQ6-R mounts will get you guiding below 0.75 total rms on average to good seeing nights
Maybe check all the above
Hope this helps
Cheers
Martin