Er the 16" Meade is 125lbs or 58Kgs - so its four times more than a CG 5 could carry, or more than twice what a EQ6 could carry by my understanding.
I agree that loading a mount to its maximum weight isn't likely to do wonders for your astro-photography. I presume if you are autoguiding well and your setup is fully protected from the elements and fully automated (so you never have to touch the running set-up) you can minimise the problem with a heavy load; not that it will do wonders to your bearings!
But that is just a theoretical mindset with no deep practical experience to field test it yet. Most people won't have an ideal set-up either so I'll experiment before I can even say it works for me!
With my well aligned gear - quite heavily loaded - I can leave it for three hours and a star at low magnificant remains almost dead centre, with auto-guiding this should be perfect and if the adjustments are very, very small and every say 15 seconds, I'd guess you could image to some degree on this?
The way to avoid all this is to get a bigger mount, like I say a goto EQ6 has to be a very capable, versatile and effective first platform to image from on a budget. My choice for a first Goto mount was easy, my second and/or third goto mount assuredly won't be!
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