Re: Recent image with G-11 PMC-8 & ES 127 FCD-100 #G11 #astrophotography


Jerry Hubbell - Explore Scientific VP Engineering
 

On Sat, Nov 9, 2019 at 10:16 AM, Jennifer Shelly wrote:
Additionally I am having a hard time finding the correct spacing for the FF/FR as my search results have yielded anywhere between 55 mm to 65 mm.
Hi Jennifer,

We use the 3-inch 0.7x FRFF on the 6.5-inch ES 165 FPL53 ED APO CF scope (with a Moonlite focuser - I think they are the best) in the MSRO and it works pretty well. The scope is F/7 and with the FRFF it is f/5.2. The design spacing is 55 mm which is what we use. Our imaging train is a QHY163C camera with QHY FW-S and the FRFF.  It's pretty flat in the middle but the field curvature starts to increase towards the corners when using larger chip cameras. 

--
Jerry Hubbell
Vice President of Engineering

Explore Scientific, LLC.
jrh at explorescientific.com

www.explorescientificusa.com
1010 S. 48th Street
Springdale, AR 72762
1-866-252-3811

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
Mounts
: 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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