Not Your Everyday Banana

by Bart Arondson

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Why don't they make all DSLRs with an electronic shutter? Is it technically possible?

Surely this would allow easier syncing with flashes (rather than the usual 1/200s or 1/250s max).

I could even imagine a special RAW format that basically recorded all data from the CCD for, say, a second and then in software you could retrospectively shorten that time window. eg. only use data recorded in the first 1/100h of a second...

Or am I being stupid?

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3  
No need to say you're being stupid - it's a good question. –  Reid Jul 16 '10 at 15:38
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Actually no. Electronic shutters have slower sync-speeds because of the time it takes to shift data out of the exposed area. Cameras that have both types of shutters will easily show you this. –  Itai Nov 4 '13 at 21:23
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really? then why do Basler ACE CCD and CMOS, 1/4" through 1 inch sensors, global and rolling electronic shutters alike all have: "The minimum allowed exposure time for all camera models is 24 μs.", with framerates that far exceed DSLRS, exposure start delay 20-850us depending on the model . (Seems to me there is a bandwidth issue more than a synch speed issue). –  Michael Nielsen Nov 4 '13 at 23:51
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3 Answers 3

up vote 18 down vote accepted

Sounds nice but apparently there are currently some technical limitations:

An electronic shutter requires the sensor to be equipped with what is commonly called "snap shutter" circuitry. Basically, this is a second set of diodes, as big as the light gathering photodiodes, but shielded under a dark cover, and some additional switches. To shoot, the photodiodes are cleared of charge, exposure starts, and at the end of exposure, the charge in the diodes is transferred over to the shielded storage part of the cell. The cell is already full of stuff, so the only way to make space for this extra circuitry is to cut the size of the photodiode in half. Which cuts dynamic range and low light, high ISO performance.

Source: Joseph Wisniewski

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Wouldn't DSLRs with live view and video capability already have these diodes? –  Evan Krall Dec 30 '10 at 1:59
    
No, because they don't readout every line and pixel the same in Live View/Video as when the 18-24 MP picture is taken. –  Michael Clark Jan 6 at 6:02
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Some good readin' here.

Some key notes...

Cameras, typically smaller point-and-shoot cameras, that use no mechanical shutters typically use an interline transfer sensor. An interline transfer sensor dedicates a portion of each pixel to store the charge for that pixel. The added electronics necessary to be able to store the charge for each pixel reduces the fill factor of the pixel, in turn reducing it's ability to capture light since a portion of each pixel is not light sensitive.

Interline transfer sensor's typically have higher noise levels and lower sensitivity than the full frame sensor's used in high end digital SLR's.

So, basically, the electronics required for an electronic shutter result in compromised image quality.

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Cameras without mirrors, and especially without focal-plane shutters, are silent. as are cameras with leaf shutters like the FUJI X100, The Sony RX10, the Canon GX etc. When cameras get interchangeable lenses, they must have a focal plane shutter.

Some 4/3 cameras like two or three models of the high-priced Panasonics, especially the GX7, can use an additional built-in electronic shutter.

The focal-plane shutters of current cameras tend to be louder when they are designed to achieve very short exposures as 1/4000 or 1/8000, because the blades translation is made at a greater velocity; the new Olympus OMD M1 is thus louder than the older one (M5). The Sony Nexes are loud, because they are small. Mass can dampen the noise.

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Welcome to Stack Exchange! It sounds like you know a lot about this particular topic. The question at hand, though, is why don't all DSLRs use electronic shutters. And I don't think this really answers that. –  mattdm Nov 4 '13 at 23:02
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