Hi Kelvin,
I don't have a side-by-side set up yet. I'm just testing the individual components one at a time on a Star Adventurer. I have an Astro-Physics AP900 that I'll use for the dual system.
Cameras are an ASI1600mm and ASI294mc which I'll be using with camera lenses (lots of them... Samyang 135mm f/2, Nikon 85mm f/1.4, Nikon 50mm f/1.2, Zeiss 21mm, 35mm and 100mm, etc.) and a Borg 55FL f/3.6 scope that should ship from the US shortly. At present I'm just trying to sort out spacing and tilt so that I can get decent looking stars in the corners.
I hope to do a lot of narrowband from home with the ASI1600mm and then, like you suggest, suck down photons as quickly as possible with both systems on the rare occasion that I get out to a dark site.
Cheers,
Rick.
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