Electronic Shutters vs Mechanical Shutters – What Is The Difference?


Electronic shutters and mechanical shutters, so what really is the difference?

The majority of us know what a shutter is in relation to our cameras. It's the mechanism by which we expose the sensor to light for a predetermined period of time. Traditional DSLR cameras use a mechanical shutter, while the majority of mirrorless cameras have an electronic shutter.

px sec focal p shut electronic shutter vs mechanical shutter
A focal plane shutter firing at 1/500 of a second with the “gap” clearly visible. This shutter is on a Nikon film SLR. Image by  Ommnomnomgulp

However, what you might not know is that some cameras these days have two variants of the shutter, a traditional mechanical shutter, and an electronic shutter. The Fuji X-T series is an example of that. So what are the differences and pros and cons of these two different types of the shutter?

First Up, The Mechanical Shutter

Mechanical shutters use a rolling curtain that crosses the sensor at a fixed pace. There is a front curtain and a rear curtain, and a gap between the two. The gap between the two determines our shutter speed. The larger the gap, the longer the shutter speed.

On DLSR cameras, the mechanical shutter also has to synchronize with the mirror. The mirror is what reflects the light from the lens into the camera’s viewfinder. As the shutter button is pressed, the mirror rapidly flips out of the way just before the shutter curtains begin their travel across the sensor plane.

In older film cameras, the shutter traveled horizontally across the film plane, but in more recent cameras, the shutter moves through the vertical plane. This allows for much shorter shutter speeds due to the shorter travel the curtain needs to make.

electronic and mechanical shutters
Photo by Jack Gisel

As you might imagine, for a camera to do this in 1/1000th of a second or less involves some very sophisticated engineering and electronics. As with all electro-mechanical components, this can fail. For this reason, camera companies specify an actuation figure for their shutters. This is the number of shutter operations the camera can make before the shutter may fail. Let’s look at the pros and cons of the mechanical shutter. 

Pros Of Mechanical Shutter:

  • Higher Flash Synchronisation – Most mechanical shutters will allow flash to operate at higher speeds than electronic shutters
  • Rolling Shutter Reduction – Rolling shutter manifests itself as a lateral distortion in images, particularly where the camera is panned fast. This can also reduce the jello effect when shooting video.
  • They work much better with flickering light sources such as fluorescent.

Cons Of Mechanical Shutter:

  • Lower Top Shutter Speed – Due to the mechanical nature of these shutters, the maximum speed is often significantly less than an electronic shutter.
  • Limited Life Span – The moving parts of a mechanical shutter are prone to wear and tear and have the potential to fail.
  • Shutter Shock/mirror Slap – These two issues can cause slight camera shake in images if not controlled. 
  • Response Time – mechanical shutters in some cameras have slightly slower response time due to the delay in time between pressing the shutter release button and when the camera takes the photo.

Mechanical shutters are best for portrait, wedding, events photography, as you may use a flash when needed. When there is artificial light in the scene, again, use a mechanical shutter to avoid rolling shutter issues. Sports, cityscape, night photography will do best with mechanical shutters, as you may have to shoot in situations where you are dealing with artificial light.

front curtain shutter bird photography
Photo by Jason Row

The Electronic Shutter 

If you own a mirrorless camera, you will have probably noticed that with the lens off, you can see straight through to the sensor. The way the electronic shutter works is to simply switch the sensor on and off again. However, most cameras use a rolling electronic shutter where the sensor is switched on and off, row by row.

The lack of mechanical features makes them completely silent. However, there are a number of issues with electronic shutters. Let's look at the pros and cons. 

electronic shutter operates differently wildlife photography fast shutter speeds
Photo by Vincent van Zalinge

Pros Of Electronic Shutter:

  • Totally silent, ideal for wildlife photographers and other genres where the photographer needs to be quiet.
  • Capable of much higher top shutter speeds than traditional mechanical shutters. 1/32000th of a second is not unusual
  • Capable of much higher continuous shooting rates as the camera does not have to wait for the shutter to close and the mirror to return.
  • Electronic shutters in mirrorless cameras can eliminate viewfinder blackout, making it a significant advantage during continuous shooting.
  • It can reduce vibrations, thereby avoiding blurry photos at specific shutter speeds.

Cons Of Electronic Shutter:

  • Due to the line-by-line pixel scanning of an electronic shutter, a rolling shutter can be much more pronounced, particularly in fast-moving subjects.
  • Electronic shutters do not deal well with flickering light sources. Often banding can be seen around such lights and is difficult to remove.
  • Flash sync speeds are often much lower with electronic shutters.
  • An electronic shutter may sometimes prevent you from using certain menu items or features in specific cameras.

Unless there is artificial light or any other moving objects, when shooting landscapes you can use an electronic shutter. Street and documentary photography can do with an electronic shutter, as you can shoot quietly. However, if there is artificial light in the scene, switch to a mechanical shutter.

front curtain shutter electronic shutters sports photography fast shutter speeds
Photo by Jason Row

Which One Should I Use?

Not all cameras will offer both an electronic and mechanical shutter however; there are increasing numbers that do.

Unless you subject your cameras to huge numbers of shutter actuations or have a need for absolutely silent operation, then the mechanical option is most likely to be the better option.

There are some cameras that now allow you to have a combined hybrid electronic and mechanical shutter. This gives you the pros of both but also some of the cons of both. For the average everyday user, the mechanical shutter, if available, will be the best option.

Let us know in the comments below which type of shutter you prefer.

Further Reading:

About Author

Jason has more than 35 years of experience as a professional photographer, videographer and stock shooter. You can get to know him better here.

Thanks for the informative summary Jason. Question, when you have exceeded a mechanical shutter rating, are you at the risk of having to replace the camera. I am looking at an OLYMPUS OMD EM 1 MII, used, and it is rated for 200,000 mechanical shutter (whatever the units are) and this camera is at 6600.

Depending upon the specific manufacturer, shutter ratings may (or may not) be MTBF calculations. As with many electro-mechanical devices built to fairly high tolerances, some will fail much earlier than predicted while others will last much longer. The majority will be inside the bell curve closer to the predictions.

The good news is that most mechanical shutter replacements only cost a few hundred dollars for cameras that cost several thousands of dollars. The shutter in a lower end APS-C might cost $200-300 to replace, while shutter s for higher end FF cameras can run about $500-700.

In the case of Olympus, though, it might be a bit riskier assuming the needed shutter assembly will be available in a few years when you might need one. But a camera with only 6,600 activations is practically brand new. That’s about like a car with only about 3,000 miles on the odometer.

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