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Greg this is fire wire. USB3 is not yet available for anything but a CMOS sensor. I am sure in the coming years large format CCD's will be used with USB3 cameras.
A RAM drive is an software drive that utilises the RAM of your machine to prevent dropped frames. It allows all the frames to be gathered and then downloaded after recording stops. It can take some time to do this though.
The camera price is $1995 US plus postage.
Ken Newtons rings don't seem at this stage to be affecting this camera model. I found that the rings become most evident at high magnification with use of a 3x barlow and upwards. Sometimes simply rotating the blocking filter helps to reduce the problem but flat framing works best to eliminate the issue.
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