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    Senior Member Samuel H's Avatar
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    I added the numbers for the a99 II. Not bad at all, and in particular much better than the a7r II.


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    You have some (I assume welcome) competition:
    http://www.imaging-resource.com/news...pretty-minimal


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    Senior Member Samuel H's Avatar
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    Definitely welcome. In fact, I'd gladly stop running my measurements if somebody else ran and published accurate numbers for most cameras. Hopefully imaging-resource will test video mode too... (that post is only about stills).


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    They do say they have a video article in preparation in the text.

    BTW I just wrote this somewhere else and thought worth a mention...
    If you can read the sensor fast enough you can presumably simulate an ND filter for video, internally in the camera, by taking 2, 3 or more electronic-shutter exposures during your shutter open period and merging them, to get the correct blur.
    E.g. the A9 can read the full sensor in 6.68ms so let's assume it can read the 16:9 crop in 5.64ms. A 24 fps 180 degree shutter exposure is 20.8ms so you could have 2 or 3 exposures of as short a time as you'd like and merge them together.
    For example 3 stops (20.8ms/8 = 2.6ms):
    Start first exposure. Wait 1.3ms from top line enabled and read out image.
    Wait until 1.3ms before end of 20.8ms period and start second exposure, 1.3ms after top line enabled start reading data out.
    Merge data to get more accurate blur.
    There's 13.86 ms doing nothing in the middle, so could do a 3rd exposure then (or a 4th as only want 2.6ms active time total and the final read-out is after the end of the exposure period) , e.g. to help with flickering lights, which could be an issue.


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    Senior Member Samuel H's Avatar
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    The problem with that is that you're unlikely to have the fps you need for that. With the a9, even if you can read the full sensor in 7ms, you still can only do that 20 times per second (even though you can fit 150 "7ms" bits inside a second). Make it 16:9 and you can do 24 fps with 6ms shutter. But you'd need 72 fps in order to implement what you comment.

    Either that, or you have to temporally store your analogue charge and add to it before reading its value on the ADC, but then you're talking about pixel design, and the total readout time is mostly irrelevant.


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    Curious about the Sony A9. Thank you so much for this resource!

    From :
    http://www.imaging-resource.com/news...pretty-minimal

    "Our previous (and as yet unpublished; stay tuned!) rolling shutter testing concentrated on video recording, where we found typical values ranging from 1/40 - 1/75 second. We hadn't previously paid a lot of attention to still-shooting electronic shutters, as they didn't strike us as having very strong use cases. With the A9, though, the e-shutter is the only way to get to it's astonishing 20fps full-resolution continuous-shooting frame rates, and Sony has been touting the advantages of truly silent (electronic-shutter) shooting for noise-sensitive situations and truly candid people-photography."


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    Senior Member Samuel H's Avatar
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    Yes, the a9 definitely would be interesting to test.

    Meanwhile, another interesting camera added to the list: the C200 clocks in at 16.1ms, both in 4k and 1080p, always at 25 fps.


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