Mirrorless Camera Shutter Shock: Physical Mechanism and Guide to Eliminating Micro-Vibration Blur

1. Shutter Shock physical microshock mechanism

After many high-pixel mirrorless mirrorless cameras became popular (such as 45-61 million pixels), photographers often encountered strange things: even though they used a super-heavy tripod, turned off anti-shake, and fired with a shutter release, when checked at 100% magnification, the fine edges of the picture still showed an extremely slight "one-way horizontal or vertical trailing double shadow blur":

1. High-speed mechanical shock wave of mechanical front curtain:

• For a fully mechanical shutter, the front curtain blades are in a tense standby state before the exposure begins;
• The moment the shutter is pressed, a powerful spring drives the mechanical front curtain to slam downward at extremely high acceleration;
• When the curtain reaches the end of its stroke, it hits the metal stopper inside the fuselage at high speed, and a tiny kinetic energy mechanical shockwave (Mechanical Shockwave) explodes!

2. Resonance disaster of suspension anti-shake mechanism:

• The CMOS sensor of modern mirrorless cameras is not fixed to the chassis with rigid screws, but is suspended in a micron-level magnetic field guide by electromagnets (five-axis anti-shake mechanism IBIS);
• The mechanical shock wave from the front curtain impact penetrates the fuselage and instantly excites the sensor anti-shake suspension component to produce high-frequency simple harmonic forced microscopic resonance;
• During the few milliseconds when the sensor is shaking violently, the exposure is in progress and the details of the photo are irreversibly blurred and defocused.

2. Fatal danger shutter speed sensitive range (1/60s to 1/250s)

Shutter shock does not destroy the picture at all shutter speeds. It has an extremely narrow but fatal resonance time window:

1. Ultra-fast shutter (>1/500s) - no impact:

• The shutter exposure time is extremely short (less than 2 milliseconds). The mechanical shock wave has not had time to be transmitted to the core of the sensor. The exposure has already ended, and the picture is clear and sharp.

2. Super slow long exposure (>2 seconds) - no effect:

• Mechanical shock only occurs in the first 10 milliseconds of the front curtain falling;
• In the total exposure of several seconds, this 10 millisecond microshock only accounts for 0.1% of the total exposure energy, and is completely diluted and overwhelmed by the subsequent 99.9% stable and clear light.

3. Fatal dead zone (1/60s ~ 1/250s) - devastating blow:

• It is exactly in the peak range of the mechanical resonance damping waveform, and the exposure time (4ms~16ms) just covers the entire microseismic process;
• Shooting with a fully mechanical shutter at this shutter speed, the center limit resolution of high-pixel bodies plummets by more than 40%!

3. Three golden ultimate strategies to eliminate shutter vibration

1. Resident opening: Electronic front curtain shutter (EFCS) - the most perfect anti-shock weapon:

• In-camera settings: Change the shutter mode to "Electronic Front-Curtain Shutter";
• Physical revolution: When the exposure starts, the mechanical front curtain does not move at all, and the sensor chip charge is cleared directly to start the exposure; it is not until the exposure ends that the mechanical rear curtain slides down and closes.
• Due to zero mechanical impact and zero vibration energy release at the start of the exposure, shutter shock is 100% completely eliminated from its physical source!

2. Tripod slow door time-lapse shooting (Shutter Delay/Self-Timer):

• Turn on "Exposure Delay Mode (Exposure Delay Mode, set to 0.5 seconds to 2 seconds)" in the camera;
• Completely avoids the external human body torque exerted on the body by pressing the shutter button with your finger.

3. Full electronic shutter silent mode (Silent Shooting):

• When shooting completely still indoor still life, macro and scenery, turn on the purely electronic shutter without any mechanical movement, achieving absolutely zero physical vibration and the highest resolution output.

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