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doc:appunti:hardware:olympus-e-m10-mark-ii

Olympus E-M10 Mark II

Sensor Size 17.3 mm (H) x 13.0 mm (V)
Sensor Type 4/3 Live MOS Sensor
Effective pixels Approx. 16.1 million pixels, Aspect ratio 1.33 (4:3)
File Format RAW (12-bit lossless compression), JPEG, RAW+JPEG, MPO(3D still)
Recording image size 4608 x 3456 pixels RAW or JPEG
Image Stabilisation Built-in 5-axis sensor-shift image stabilisation for movie and still photos
Finder Type Eye-level OLED viewfinder, Approx. 2.36M-dot
Monitor Type 3.0-inch tilting monitor, Approx.1040k dots (3:2), electrostatic capacitance touch panel
Anti-shock Mode Electronic First Curtain Shutter 1/320 - 60 sec. (for speeds over 1/320 sec., mechanical shutter will automatically be selected). Shutter start delay: 0 - 30 sec.
Silent Mode Electronic Shutter 1/16000 - 60 sec. Shutter start delay: 0 - 30 sec.

Anti-Shock and Silent Shutter

The Olympus E-M10 Mark II has two shutter modes called Anti-Shock and Silent. To fully understand the meaning of these modes, you need to be familiar with some concepts:

Olympus E-M10 shutter. Photo by hmx0979, dpreview.com

  • Mechanical shutter - The E-M10 has a mechanical shutter located between the lens and the sensor. The shutter is open during the Live View framing, because we need to see the image captured by the sensor, either on the monitor or into the viewfinder. When we push the shutter button, the shutter closes and all the sensor's photodiodes are powered-on; then the shutter opens just for the exposure time. All these movements produce the familiar sound of the mechanical shutter. Once the exposure is completed, the electronic can read sequentially all the rows of photodiodes, getting the values of acquired light.
  • Front and rear curtains - The mechanical shutter is composed of two curtains, made of horizontal blades. The first one, located toward the lens, is responsible of starting the sensor exposure; the second one, located toward the sensor, is responsible of ending the exposure. These two movements are both bottom-up, and they are required to allow an equal exposure of all the photodiode rows.
  • Electronic shutter - In a digital camera, a mechanical shutter is not actually required: the sensor can be read line-by-line. You start the exposure of a row of MOS photodiodes by turning it on, and you end the exposure by reading the values of the captured light. The rows are scanned one after the other, so it is called a rolling shutter. Because there are not moving mechanical parts, the operation can be very quick and there are no vibrations nor acoustic noise.
  • Electronic front-curtain shutter (EFCS) - The movement of blades of the first curtain in a mechanical shutter, can introduce a vibration which can lead to blur in the photograph, especially with very long focal length lenses. The second curtain is not so critical: its vibration occurs when the exposure is already ended. So it is possible to use the electronic shutter in place of the first curtain to start the exposure, and the mechanical second curtain to end it. This prevents the shock of the mechanical shutter and shorten the acquisition time of a fully electronic shutter.
  • The rolling shutter effect - Using a rolling electronic shutter, the photodiode rows are not exposed all at the same time, but sequentially, e.g. from top to bottom. This means that the rows are acquired at slightly different times, eventually producing artifacts with moving objects or rapid lights events (lightning or the flickering of fluorescent lamps).

Rolling shutter effects on photos from commons.wikimedia.org:

Helicopter taking off at Hat Yai Hospital, November 2010.jpg (commons.wikimedia.org) Wien-Prag rolling shutter P1270959.jpg (commons.wikimedia.org) Lightning rolling shutter.jpg (commons.wikimedia.org)

Once you understand the concepts above, you can understand the Olympus E-M10 settings.

Anti-Shock

  • Activating the Anti-Shock feature (symbolized by the diamond, from the playing cards suit), you enable the electronic front-curtain shutter.
  • The electronic front-curtain shutter is actually enabled only for exposure times from 1/320 to 60 sec. For shorter exposure times, the mechanical shutter will automatically be selected.
  • It is also possible to enable a delay from the button press to the actual shutter activation, to avoid the shake produced by the button press. The delay can be from zero to 30 sec.
  • This feature reduces the vibrations caused by the front-curtain blades movement and possibly by the button press, without incurring too much into the rolling shutter effect. The acoustic noise from the mechanical shutter remains.

Silent Shutter

  • Activating the Silent feature (symbolized by the heart, from the playing cards suit), you enable the fully electronic shutter. This feature is available for exposure times from 1/16000 to 60 sec.
  • It is also possible to enable a delay from the button press to the actual shutter activation, to avoid the shake produced by the button press. The delay can be from zero to 30 sec.
  • This feature eliminates the vibrations caused by the shutter curtains and possibly by the button press, but incur into the rolling shutter effect. The acoustic noise from the mechanical shutter is suppressed.

Settings

  • To prepare the Anti-Shock and Silent modes, press the Menu button and select Advanced shooting optionsAnti-Shock/Silent. Here you can set the time delay between button press and shutter activation, or you can disable the features altogether. (setting them to Off).
  • When the Noise Reduction for Silent mode is set to AUTO, it means that the mechanical shutter could still be activated in Silent mode, if you use exposure times of 4 seconds or more. The camera closes the shutter to acquire a black frame and to apply optical noise reduction to the image.
  • From Super Control Panel, select the Sequential shooting/Self-timer option. Here you can choose the preferred mode with eventually the Anti-Shock or Silent variant applied.

Web References

Acronyms

AEL
AFL
C-AF
EVF
HDR High Dynamic Range: technique used to reproduce a greater dynamic range of luminosity, see High-dynamic-range imaging.
MF
RC mode Remote Control Mode for external flash units.
S-AF
S-OVF

Scene Mode

Portrait According to manual, it produces beautiful skin tones.
e-Portrait The manual says about this mode that it produces smooth skin textures.

OLYMPUS Image Share

The OLYMPUS Image Share Android app has a very poor rating from users (2,7 out of 5 stars, at present). Nevertheless I downloaded the big, fat app (over 50 Mb) to give it a try.

The app will require the following Android permissions:

  • Storage read and write, used to download photos from the camera to the phone.
  • Access to camera to read the QR code used in pairing with the camera.
  • Record audio via the microphone, used for the timer? FIXME
  • Location is used only to share our position with friends. To add geotag to photos it is required to install also the OLYMPUS Image Track app (which has an orrible user's score of 1,9 out of 5!).

The app will collect usage information and send it to the vendor:

  • Model and firmware version of connected cameras.
  • Operating system and software versions.
  • Language, geographical region and app uasge statistics.

It should be possibile to disable information discolusure by disabling ImpostazioniInvia dati di utilizzo.

Web References

doc/appunti/hardware/olympus-e-m10-mark-ii.txt · Last modified: 2019/12/06 18:59 by niccolo