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Allan I reckon that the coma would drive most imagers crazy at F/3 regardless of the benefits, and collimation would also be a constant headache. As to the weight, there are much lighter alternatives if you have some ATM skills - my 10" f/5 imaging newt OTA only weighs 12.6kg, uses carbon fibre struts. There are a fair number of exotic designs emerging in the market but you have to consider the night to night use and management of the setup. The quest for ultra low F numbers is nuts in my opinion, and not worth the alledged benefits in exposure time savings. For imagers who are setup to guide their mounts the potential of shorter subs is not that great an attraction to justify the probems you would buy into at F/3.
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