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Long exposures with electronic shutter?

Discussion in 'General X Camera Forum' started by ojporqpojrewpo, Jun 13, 2018 at 2:45 PM.

  1. ojporqpojrewpo

    ojporqpojrewpo Premium Member

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    Does anybody know if there are drawbacks when you take long exposures (>30s) with electronic shutter? I know there can be artifacts with very short exposures but how about long ones?
     
  2. lawsofphysics

    lawsofphysics Premium Member

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    Yes, artifacts can appear when the ES shutter read-out rate aliases with camera or subject motion and, or light affected by modulation.

    For instance, some LED lights are controlled using pulse-width modulation. The modulation rate aliases with the ES read-out rate. The most common result is color banding.
     
  3. ojporqpojrewpo

    ojporqpojrewpo Premium Member

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    Would that apply to something like star trails or Milky Way shots?
     
  4. specLegacy

    specLegacy Premium Member

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    I haven't used ES that much, but my thought is that most of the drawbacks of ES happen under artificial light or with fast-moving subjects.

    ES might also introduce more noise than MS, but that's probably negligible if you're stacking a lot of images to create star trails.

    Milky Way shots are usually under a minute, so it would be worth trying both the ES and MS to see if there's any difference. One simple advantage for MS is that you can hear when the exposure is done :)
     
  5. ojporqpojrewpo

    ojporqpojrewpo Premium Member

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    That's one of the reasons I am asking. The shutter noise bothers me when I do stacked star trails and also it feels like it adds wear to the shutter mechanism. Probably not a real concern but something that made me think ...
     
  6. dem

    dem Premium Member

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    I don't think there are any drawbacks as far as the image quality is concerned.
    I wonder if there is an explanation for why this might happen, test shots?
     
  7. specLegacy

    specLegacy Premium Member

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    I think I have to take my comment back. I got this misconception from Sony cameras, which drop to 12-bit mode when using electronic shutter, whereas they use 14-bit mode for images taken with the mechanical shutter. It seems that there's no image quality penalty for Fujis. Not that I could find after a quick search, anyway.
     
    lawsofphysics and dem like this.
  8. lawsofphysics

    lawsofphysics Premium Member

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    I doubt it. The earth's motion is very slow compared to the ES read-out speed.
     
  9. lawsofphysics

    lawsofphysics Premium Member

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    I doubt the input-referred read noise level is higher with the ES.

    Here is a blog article Please login or register to view links that documents one person's ES problems with a SONY A7s. It is entirely possible these results are irrelevant to FUJIFILM's ES design.
     
  10. Doug Pardee

    Doug Pardee Premium Member

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    The next time someone asks how fast the sensor readout speed is, I think I'm going to reply, "at least it's faster than the earth's motion"! ;)
     
  11. ojporqpojrewpo

    ojporqpojrewpo Premium Member

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    Tried some long exposures with ES last week and it worked flawlessly.


    Please login or register to view links
     

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