I built a dual imaging system over the past 8 months mostly due to extreme boredom caused by the past year. I choose to go with a WO GT81 IV f/5.9 that I can step down to f/4.72 using the WO 6AIII FR/FF going from 478mm to 382mm for the focal length. The other scope is a AT 152EDT at f/8 running 1200mm for a focal length that will with the .72 FR/FF go down to f/5.76 for an 864mm focal length. It took a bit to collect the pieces and on Feb 8th I was able to run both and collect a couple of hours of photons. For me at least I set this up as a test bed to eventually have a remote rig somewhere it is darker than where I live, not to mention weather challenges as it has been snowing the past week with not much of a break being forecast for the next week. Both scopes have ZWO EAF's for automatic focusing and SGP was set to refocus at .5 C temp changes and that happens often during a imaging session during the winter. In the past I always used drizzle but have to figure out how to use it when shooting with two cameras at different sub lengths. The cameras are both based on the Sony IMX571 APS-C chip with one being an Orion G26 OSC and the other a ZWO ASI2600MC-P that has a ZWO EFF attached to it that has some narrowband dual and tri-band filters. While I do not use a FF in the 152 I am using one on the GT81 and it is one I have had for years and is the AT2FF. I did crop the GT81 picture just to bring the objects into view better but the stars did look pretty good all the way to the edge. Guiding is a ASI120MM-S in a WO 50mm Uniguide scope mounted in the Saddle Handle Bar on the GT81. The total weight is 53.4 lbs on a mount rated for 75 lbs of imaging gear. All power and USB is run off of a Pegasus UBP v2 attached to a dovetail plate and the rig is run from a mini PC mounted to the eyepiece tray on the mount. Two wires from the scopes come down in a soft wire loom with one being a USB to PC and the other being 12v DC running to the UPB.
I like you don't really care what others think of my hardware choices as they were arrived at based on what was available at the time as I am not one who likes to wait lol and health issues have told me to just do it and yes other equipment choices are possible and time will tell if I make them but this has been fun and a learning experience. For me last week it felt like something was accomplished lol mind you on something 99.99999% of humans will not nor do they care about but I'm in it for myself and with only a few message boards, videos and the stars aligning this was put together and works. When the snow stops and the skies clear I'll be back out in the backyard getting more photons collected to add to these pictures.
So native focal lengths on the 2 pictures. Two nights of subs for 2h 29m for the 152 and one night for 1h 29m on the GT81. Took the first night to work out the kinks when it came to running three cameras and two focusers at the same time but between software and ASCOM drivers it all worked.