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    Senior Member Samuel H's Avatar
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    (I read this and downloaded the clip, but haven't had time to run the numbers, and won't have it for at least a week more, maybe two)


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    Looks like this test vid might work for the GH5's 4K numbers. Wish they'd done 1080p modes too.

    https://www.youtube.com/watch?v=F1xs-2plgU4


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    Senior Member Samuel H's Avatar
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    Quote Originally Posted by geffyb View Post
    Did some testing with my A7r II. The 1080p FF mode is a great performer.

    https://vimeo.com/210155204/c8b9845da7
    Finally got to measuring this. Great performer indeed: 10.8 ms (same as in 1080p S35)


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    I'm curious as to what the T7i's rolling shutter ms is. How do you measure it. The 1DX II seems to perform very nicely.


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    Okay please note but these are 25p (I hope that's okay) from my RX100-V, which is supposed to be a noticeable improvement on the RX100-IV, so let's see if that's true...
    4k, SteadyShot On: https://vimeo.com/222000789 (Note I'm not a Pro member so the original files can only be downloaded for a couple of weeks.)
    4k, SteadyShot Off: https://vimeo.com/222001054
    FHD, SteadyShot On: https://vimeo.com/222001319
    FHD, SteadyShot Off: (To follow as I've used this week's upload allowance)
    HFR250 (note 250fps conformed to 25fps; Quality priority; 1/250 sec !), SteadyShot On: (To follow)
    Last edited by Dr_Jon; 06-17-2017 at 06:18 AM.


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    Senior Member Samuel H's Avatar
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    Thanks! I'll try to download and process these in a day or two


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    My upload limit resets early Sunday, so they other two will be a while I'm afraid. (I can WeTransfer them if you'd like, just PM me an e-mail address to send them to.)


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    BTW this is quite interesting - looks like GH5 rolling shutter is ISO-variant for stills, but possibly not for video (only 6k video was tested)!
    https://www.dpreview.com/forums/post/59729984
    (The 6k one must come from a video stream.)
    I wonder which other cameras do this and if any do it for video?


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    Senior Member Samuel H's Avatar
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    Quote Originally Posted by Dr_Jon View Post
    Okay please note but these are 25p (I hope that's okay) from my RX100-V, which is supposed to be a noticeable improvement on the RX100-IV, so let's see if that's true...
    4k, SteadyShot On: https://vimeo.com/222000789 (Note I'm not a Pro member so the original files can only be downloaded for a couple of weeks.)
    4k, SteadyShot Off: https://vimeo.com/222001054
    FHD, SteadyShot On: https://vimeo.com/222001319
    FHD, SteadyShot Off: (To follow as I've used this week's upload allowance)
    HFR250 (note 250fps conformed to 25fps; Quality priority; 1/250 sec !), SteadyShot On: (To follow)
    I finally got to measuring this, and wow, is that a big improvement. It's gone from the bottom of the chart to a solid mid range. I could already see it was good by looking at the footage but the numbers are pretty impressive.

    I don't see a measurable difference between steadyshot on or off, so I'm putting those together.

    Thanks a lot!


    RX100 V 250 fps ---- 3.8 ms (3.8-3.8)
    RX100 V 1080p ----- 13.9 ms (14.4-14.0---14.2-13.1) (first 2 with stabilization, last 2 without)
    RX100 V 4k -------- 17.5 ms (18.1-16.3-17.7---17.7-16.9-18.5) (first 3 with stabilization, last 3 without)

    RX100 IV 1080p ---- 16.9 ms (16.5-17.3) (without stabilization it's slightly faster: 16.1)
    RX100 IV 4K ------- 36.6 ms (36.4-36.7) (without stabilization it's slightly faster: 35.7)


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    Thanks, that's interesting. I assume as the 250fps is so much faster it's skipping a lot of pixels (of course it HAS to be less than 4ms or it would be in trouble). Although I should have said it's actually 1,8241,026 scaled up to FHD so it is usually described as a mild sensor crop - actually the FoV seems identical to the standard FHD to me. Also it has two 250fps modes, the one I used is quality priority which should perhaps be mentioned (the other is speed priority and shoots at 1,824616, but for nearly twice as long).

    Ah, some maths says 1,8241,026 is exactly 1 pixel in 3 horizontally and vertically (so 1 in 9 in total, although not necessarily evenly spaced due to the Bayer array). Also the rolling shutter is about a third, so I guess that's what happens.

    Long version...

    Quality Priority:

    NTSC/PAL
    240fps/250fps @ 1,8241,026 (about 4 seconds recording) 1 pixel in 3 H and V
    480fps/500fps @ 1,824616 (about 3 secs) 1 pixel in 3 H, 1 in 5 V
    960fps/1000fps @ 1,244420 (about 3 secs)

    Shoot Time Priority:

    NTSC/PAL
    240fps/250fps @ 1,824616 (about 7 seconds recording)
    480fps/500fps @ 1,292436 (about 7/6 secs)
    960fps/1000fps @ 912308 (about 6 secs)

    Note all are stored at FHD (by scaling) and can be saved at 24p/30p/60p (NTSC) or 25p/50p (PAL) - these set the degree of slowmotion, so 250fps shooting and 25p on card is 10x, etc.
    Last edited by Dr_Jon; 06-24-2017 at 02:52 PM.


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