Rolling Shutter VS FPS confusion

Started 3 months ago | Discussions thread
Dem Bell Regular Member • Posts: 343
Re: Rolling Shutter VS FPS confusion

sybersitizen wrote:

Dem Bell wrote:

If you use a camera with a high FPS rating, say 20+, you will struggle to spot any jello effect in your shots of dancers.

The frame rate is not an indication of the electronic shutter sensor readout speed.

Well, it is if you have to wait for the previous frame to finish before starting a new frame. For example, in Fuji land (model, readout time, FPS):

X-T100, 1/6 sec, 3 FPS

X-T1, 1/15 sec, 8 FPS

X-T2, 1/25 sec, 14 FPS

X-T3, 1/40 sec, 20 FPS

There is a pattern, right? If the readout time is 1/100 sec no manufacturer would advertise their camera as 10 FPS, when they could probably do about 50 FPS. I suppose if the first electronic curtain is not required for the whole sensor, then it is possible to read the sensor line by line, clear each line immediately and start reading next frame achieving phenomenal FPS with slow read out times. Does any manufacturer do that?

The first can be relatively fast while the second remains relatively slow, and the second is what makes the Jello. For example, 1/30s readout speed is definitely Jello territory in many situations.

I don't actually know what sensor readout speed is required to mostly avoid rolling shutter issues with human dancers. That's the factor that ought to be clarified.

Agreed. Are there many CMOS sensors that can do much better than 1/40 sec?

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