Banding with electronic shutter?

[Rezinator]

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I took some photos a few nights ago at ISO 3200 and 6400. I used the electronic shutter to minimize movement, but got a few terrible results. Here is one example. 
is this normal with the SL/rolling shutter or is something wrong here? My Q never did this in similar lighting conditions. 
 

 

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[jaapv]

That is quite possible with some kinds of light and electronic shutter.

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[Rezinator]

Thank you for the quick response!

[scott kirkpatrick]

The electronic shutter needs about 1/30 sec to scan the whole image,, so if the band was working under disco strobe lights at, say, 250 flashes a second you might get 8 black lines across the image.  In this case there seem to be two different flashing sources, on the left and on the right.  If you get a chance before the event to see what the lighting will throw at you this is something to check for as rapid flashing is not always visible to the eye.

[Rezinator]

Thank you Scott for the explanation!

 

[andyturk]

10 hours ago, scott kirkpatrick said:

The electronic shutter needs about 1/30 sec to scan the whole image,, so if the band was working under disco strobe lights at, say, 250 flashes a second you might get 8 black lines across the image.  In this case there seem to be two different flashing sources, on the left and on the right.  If you get a chance before the event to see what the lighting will throw at you this is something to check for as rapid flashing is not always visible to the eye.

"... two different flashing sources..." PWM?

[scott kirkpatrick]

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22 minutes ago, andyturk said:

"... two different flashing sources..." PWM?

There are two sets of partial lines on the musician in front, but only one more continuous set on the barrel behind him.  What's PWM?

[andyturk]

1 hour ago, scott kirkpatrick said:

There are two sets of partial lines on the musician in front, but only one more continuous set on the barrel behind him.  What's PWM?

Oh, I was guessing about the kind of illumination that might generate very short pulses of light. PWM is short for Pulse Width Modulation. It's how most LED based lights appear to have varying brightness. In reality,  LEDs are either completely on or completely off, but they're "modulated" so quickly that the eye perceives only the average brightness.

[scott kirkpatrick]

Right.  Flourescents flicker at twice the power line frequency, but LEDs (which are common in stage and show lighting because they can change color and aim all under remote control) can be working at any frequency, and that would be a good explanation of the partial width blackouts in your picture.

Electronic shutters are a good way to learn about how lights really work, and LEDs if you can know their controls, are a good way to find out about electronic shutters.

[nicci78]

Don’t use electronic shutter. It will make your life easier 😉