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Hi Glen,
If you are going to use this telescope primarily for deep space astrophotography, then given that it will sit on EQ6 and that your camera has 3.8 micron pixels, I would personally not venture over 500mm fl, unless you like babysitting your mount and tweaking guiding settings during most sessions, if of course you aim for the best possible data. At 500mm fl your camera will give you a comfortable 1.57" per pixel, and honestly, I would probably even aim towards around 2" per pixel with EQ6 for enjoyable astrophotography and use drizzle in my workflow.
A second hand FSQ85 would tick all boxes for me with this mount and this camera.
Just my five cents.
Suavi
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