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09-20-2016, 07:44 AM   #1
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EFCS: electronic front curtain shutter

Does anyone knows what are the limitation of EFCS, and why is can't be enabled all the time?

09-20-2016, 08:00 AM   #2
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If the sensor is exposed to light, it's constantly generating a current that accumulates in the photosite pixels. The EFCS has to drain that charge so that the photosite has zero charge at the beginning of the exposure. But such circuits always have some resistance which means that the pixel begins the exposure with some residual charge in proportion to the pre-shutter intensity of light.

In photographic terms, the sensor will have a faint ghost of a image of the light from before the official shutter time.
09-20-2016, 09:48 AM   #3
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QuoteOriginally posted by photoptimist Quote
In photographic terms, the sensor will have a faint ghost of a image of the light from before the official shutter time.
Not suitable for subjects in motion then.
09-20-2016, 10:03 AM   #4
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QuoteOriginally posted by biz-engineer Quote
Not suitable for subjects in motion then.
No, and mostly because of a rolling shutter effect.

09-20-2016, 10:12 AM   #5
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QuoteOriginally posted by Gimbal Quote
No, and mostly because of a rolling shutter effect.
I thought the rolling shutter effect we see in video was due to the electronic second curtain (basically the long time to acquire information from the photosites after exposure).
09-20-2016, 10:43 AM   #6
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The information we have so far does not say it is a first curtain only implementation though. PS uses electronic curtains only. So most likely it will be something similar.
09-20-2016, 03:03 PM   #7
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Second curtain too with the firmware upgrade, and yes, unsuited to moving objects.

Cheap P&S cameras are often electronic shutter only and suffer accordingly.

09-20-2016, 10:16 PM   #8
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QuoteOriginally posted by clackers Quote
Second curtain too with the firmware upgra
Where do you read this?

09-21-2016, 01:55 AM   #9
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QuoteOriginally posted by biz-engineer Quote
Where do you read this?
I now don't know how I came to think that. The Ricoh press release says electronic shutter, but the forum news says it's only EFSC.

Forget I said it! 😀

Edit: It was the speculation here:

https://www.pentaxforums.com/forums/190-pentax-k-1/330063-firmware-1-30-new-functions-post3777766.html
09-21-2016, 03:27 AM   #10
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The message from Pentax is a bit confusing since they reference both electronic first curtain and electronic shutter.

EFC enabled in Live View is what I believe will be added. But as someone has pointed out in pixel shift mode the camera appears to use a full electronic shutter as you don't here and focal shutter noise during the operation.

So it might be possible to enable a full electronic shutter for normal use in Live View. If so this would be a first as far as I know.

Nikon allows EFC only and its use is a bit restrictive.

Paul C
09-21-2016, 04:20 AM   #11
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Both have their uses. Fully electronic would be cool during multiexposure series.
09-21-2016, 04:48 AM   #12
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QuoteOriginally posted by Paul2660 Quote
But as someone has pointed out in pixel shift mode the camera appears to use a full electronic shutter as you don't here and focal shutter noise during the operation.
Yes, correct. Pixel shift used uses "first curtain" and "second curtain" electronic shutter but we actually don't know if the implmentation of the electronic shutter in live view mode will be the same as the one used for pixel shift.

---------- Post added 21-09-16 at 13:49 ----------

QuoteOriginally posted by MJKoski Quote
Fully electronic would be cool during multiexposure series.
Yes... I'd welcome this... if it is also implemented for multiexposure , that would be awesome.
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