The cameras for that would be the Nikon 1 series, which can capture 60FPS with a shutter speed of 1/60 (obviously minus a few milliseconds) - so a 6 exposure burst would give 10 ISO, and so on. The Aptina sensor they use also has a switchable FWC, it has a high FWC (and higher read noise) for low ISOs and a low FWC (and lower read noise) for high ISOs. It's achieved with a capacitor in the pixel which can be switched in and out.
Wouldn't you need 10 exposures for ISO 10?
It doesn't seem important to implement it, given that the base ISO is higher. Rather than actually implement Heath Robinson solutions, you can simply take multiple long exposures yourself and stack them for fundamentally the same effect.
Of course, brain fart on my part.
) on this trip.Used to? My Nikon P7700, and its replacement, the P7800, both have a 3-stop ND filter built-in. It's a useful thing when trying to shoot wide open (f/2 at wide angle) outdoors on a sunny day with a max shutterspeed of 1/4000". They can also be useful for staying within the max sync shutter speed for flash, or at least minimizing the power loss when you can't get quite that slow.
Current sensors saturate one time for an exposure, so the more sensitive sensors are made, the higher the lowest practical ISO becomes. Manufacturers could make cameras so that they read and zero every line in an image in order, and add the results over time, for unlimited exposure time, but they don't seem to be interested in doing this. Kodak's Canon- and Nikon-mount DSLRs from a decade or so ago did something like this to get down to ISO 6, but that idea seemed to die with the camera.
