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    Measuring rolling shutter: put a number on this issue!
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    Senior Member Samuel H's Avatar
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    So, in the D5200 thread here, we're kind of worried that this exceptional little toy may have more rolling shutter issues than other cameras.

    This should be a measurable thing: if we knew how many ms it takes each camera to read the sensor, we wouldn't have to be looking at all those piles of not-really-comparable youtube tests.
    Also, when a new camera comes out, we would just have to measure it: no need to compare the D5200 first against a GH2, then against a D800, then a 5D3, then...

    In order to get a half-decent measure of this, I would need to get a very short clip from each camera, shot following these instructions:
    * camera on a tripod, well levelled, set at 24p and 1/50s shutter
    * a vertical line somewhere in the frame, crossing it completely from top to bottom (it can be a pole, or a corner, or a door, etc; if it is clearly tilted it will distort my measure)
    * start recording, do a quick pan left at constant speed, then a quick pan right at constant speed, repeat, reapeat, then stop recording
    (that's a total of 3 pans left and 3 pans right, which will help average off the measurement errors)

    If you want to know how your camera fares in relation to others, record that, then send me a link to the unedited file to similaar.feedback@gmail.com (or through a PM on dvxuser) and I'll use two consecutive frames to measure top-to-bottom delay in relation to frame-to-frame delay.

    Using the left-to-right and right-to-left measures, the camera-is-not-really-level and vertical-line-is-not-really-vertical issues should be averaged out. And averaging several clilps should smooth out any issues related with the pan speed not being constant (in any case, to get a constant speed, do a long pan that goes on for a while, even if it has to be slower, instead of just a quick whip-and-stop; if you can't find two consecutive frames where the skew is the same, then the pan is not good).




    RX100 V 250 fps ---- 3.8 ms (3.8-3.8)
    BM 4.6K (2K crop)--- 6.3 ms (official)
    1DX II 1080p 60&120- 6.7 ms (6.6-6.7)
    NX1 1080p ---------- 7.9 ms (7.7-8.0-8.1-7.8)
    NX500 2.5k --------- 8.6 ms (8.2-8.8-8.9)
    BM MicroStudio 4K--- 9.9 ms (official)
    a7r II 1080p S35--- 10.5 ms (11.0-10.0)
    a7r II 1080p FF---- 10.8 ms (11.0-10.5)
    1DX II 1080p 24 --- 11.1 ms (11.1-11.2)
    a6000 1080p24&30--- 12.2 ms (13.9-11.1-11.5)
    BM 4.6K (4K crop)-- 12.6 ms (official)
    BMMCC ------------- 13.3 ms (official) my measurement was 13.4 ms (13.7-13.5-12.9)
    GH4 1080p --------- 13.7 ms (13.7-13.5-13.1-14.0-13.9-13.5-13.5-13.9)
    RX100 V 1080p ----- 13.9 ms (14.4-14.0---14.2-13.1) (first 2 with stabilization, last 2 without)
    D750 -------------- 14.5 ms (14.6-14.1-14.6-14.8)
    1DX II 4k 24&60 --- 14.7 ms (14.6-14.9-14.9-14.6)
    RX10 -------------- 14.8 ms (14.5-14.8-15.0)
    GH5 --------------- 15.0 ms (official, preproduction)
    BM 4.6K ----------- 15.2 ms (official) my measurement was 16.3 ms (16.3-15.9-16.8)
    a6300 1080p24 ----- 15.2 ms (15.8-14.6)
    GX85 1080p -------- 15.4 ms (13.8-16.7-15.7)
    GH3 --------------- 15.5 ms (15.4-15.7-15.4)
    G7 1080p ---------- 16.9 ms (17.5-16.3)
    XT2 1080p --------- 16.9 ms (16.9-16.0-17.4-17.3)
    RX100 IV 1080p ---- 16.9 ms (16.5-17.3) (without stabilization it's slightly faster: 16.1)
    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)
    BMPCC ------------- 17.7 ms (official) my measurement was 17.8 ms (17.7-17.7-20.0-20.0)
    a7s APS-C 1080p --- 19.5 ms (20.3-18.4-19.5-19.5)
    a7R II 4K FF ------ 19.9 ms (19.3-19.6-19.4-21.2)
    5D3 --------------- 20.5 ms (20.7-20.5-20.4)
    D5200 ------------- 22.4 ms (22.5-22.1-22.6)
    GH4 4K/UHD -------- 22.0 ms (official) my measurement was 22.5 ms(23.2-22.3-22.7-22.7-22.4-21.8-22.4-22.8-22.6)
    BMC --------------- 23.6 ms (official) my measurement was 25.0 ms (26.7-24.8-23.5)
    5D2 --------------- 25.9 ms (25.5-26.4-25.8)
    5Dsr -------------- 27.7 ms (27.5-27.9-27.6)
    G7 4k ------------- 28.1 ms (27.8-28.5)
    GX85 4k ----------- 28.9 ms (30.2-29.0-28.8-27.5)
    NEX-5N ------------ 29.4 ms (28.8-29.6-28.9-29.8-29.8-29.1-29.7)
    a7s II FF 1080p --- 30.3 ms (29.5-31.2)
    a7s II FF 4K ------ 30.4 ms (30.2-30.6)
    a7s FF 1080p ------ 30.5 ms (30.1-32.0-30.5-30.3-29.2-30.9)
    XT2 4k ------------ 30.7 ms (30.5-30.7-31.2-31.2-30.8-29.9)
    NX1 4K ------------ 30.9 ms (30.6-31.6-31.4-30.7-30.2)
    NX1 UHD ----------- 32.6 ms (32.9-32.0-32.9-32.5)
    a7R II 4K S35 ----- 33.3 ms (35.6-32.2-32.8-35.3-32.6-31.1)
    RX100 IV 4K ------- 36.6 ms (36.4-36.7) (without stabilization it's slightly faster: 35.7)
    a6300 4K 24fps ---- 39.0 ms (39.2-38.9)

    OTHER NUMBERS, MOST OF THEM FOUND BY SQUIG SOMEWHERE ON THE WEB:

    Film --------------- 5 ms? (here)
    Scarlet ----------- 14 ms
    F65 --------------- 14 ms
    AF100 ------------- 14.85 ms
    FS100 ------------- 15 ms
    FS7 --------------- 15 ms (here)
    C300 -------------- 16 ms
    Red One MX -------- 16.6 ms
    7D ---------------- 21 ms
    5D MKII ----------- 25 ms
    GH1 --------------- 25 ms
    D90 --------------- 33 ms

    Last edited by Samuel H; 06-24-2017 at 01:22 AM.


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