Re: G-11 vs EXOS-2 #G11 #EXOS2 #TECHNICAL

Jerry Hubbell - Explore Scientific VP Engineering

On Sun, May 26, 2019 at 12:32 PM, Jennifer Shelly wrote:
I was getting very frustrated with the EXOS-2, so I took the plunge and purchased an ES PMC-8 G-11 and the difference between the performance of these mounts is night and day.
Hi Jennifer,

First I want to thank you for sticking with the PMC-Eight system on your new G11 mount. I know you could have purchased it from Losmandy with the Gemini system, so I appreciate that. I think as you said you will find the guiding results improved as compared to your EXOS 2 PMC-Eight mount. If you are powering your mount with the AC adapter you might want to upgrade the PMC-Eight firmware for the G11 to the 9T12 version which provided more motor current boosting it from 900 mA  to 1300 mA per motor. This upgrade will provide a small improvement in tracking smoothness and improve the auto-guiding performance a bit also. When I updated the firmware for the G11 PMC-Eight in our observatory, the tracking rate improved (using the TDM, not auto-guiding) from 0.5 - 0.6 RMS to 0.35 RMS. YMMV depending on how you tune your auto-guiding system.

Thanks again, I look forward to seeing further good reports from you in the future.
Jerry Hubbell
Vice President of Engineering

Explore Scientific, LLC.
jrh at
1010 S. 48th Street
Springdale, AR 72762

Author: Scientific Astrophotography: How Amateurs Can Generate and Use Professional Imaging Data
             Remote Observatories for Amateur Astronomers: Using High-Powered Telescopes From Home

Mark Slade Remote Observatory (MSRO) IAU MPC W54 Equipment
Wilderness, VA
: ES PMC-Eight G11 + Telescope Drive Master (TDM)
Scopes: ES 165 FPL-53 ED APO CF, ES 102 FCD100 ED APO CF
Cameras:  QHY174M-GPS + FW, QHY163C
Misc: 3-inch 0.7x Focal Reducer Field Flattener, Filters: Luminance,
Red, V-band Photometric, Diffuser, 200 lpmm Spectral Grating

Software: MaxIm DL 6, Cartes du Ciel, Astrometrica, AstroImageJ, AutoStakkert!

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