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Guest Message by DevFuse
 

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Shutter Lag - Verdict


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23 replies to this topic

#1 markopa

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Posted 03 June 2012 - 03:47 PM

As announced I've tried to measure the shutter lag. This could be done in two ways without being intrusive into the camera:

a) Each camera action consumes battery power. That said one could measure the current drain from the battery. The current waveform directly follows the camera actions. However this approach is more com0plicated as you have to solder few wires t othe battery plus teh current waveform could be smoothed by the internal electronics capacitors and power managment circuitry.

B) The second method is by recording the sounds. Every mechanical action of the camera emits sound. By recording the sound and measuring the intervals one could figure out what the camera is doing. And that was the method for measuring shutter lag.

Below is a typical audio footprint of the cpro1 taking a shot. Camera setting were:

- MF, prefocusued
- Manual expsure 1/4s
- EVF
- ISO1600 (manual)
- Latest camera and lens firmware, 35mm lens

Posted Image

So let examine the audio fingerprint:

The part highlighted by the red circle is the X-Pro1 taking an exposure:

Posted Image

Taking into account the sampling frequency of 44100 samples per second we can observe the exposure time:

Posted Image

The grayed region is approx 11132 samples which leads to (1/44100)*11132 = 252ms. So we are pretty accurate as our manual exposure time was set to 1/4s.

Moving further we can measure the part before the exposure - the shutter lag:

Posted Image

Again, the grayed region is 2132 samples which yields to a shutter lag of 48ms. Hum. Not as declared, but not so bad.

So why I'm missing shots if the lag is only 48ms ? Lets examine again the first audio fingerprint. We can notice tow small dots after the exposure has been taken. Intrigued by this I started to observe what the X-Pro1 is doing in that moment ? Yes, those are the blades returning after you depress the button.

Posted Image

We can observe this movement after the first and second exposure. After each exposure I was again half pressing the shutter button preparing the camera for the next shot. So far so good. But, hey ? What happening after the third exposure ? The blades were not returned into the typical position, but just half of the operation was performed by the xpor1. Whoups ? :blink:

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Bankg ! Pressing the button in such situation the X-Pro1 has to first move the blade to its final position and than take the shot. Let's measure the "lag":

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There are 9924 samples grayed which leads to 225ms. Ajajaj ! :huh:

Verdict:

- The shutter lag is contained below 50ms
- For some reason after you take one shot you don't allow the xpor1 to take its time and settle down, but you half press the shutter button as soon as you can an anomaly happens which results in a consequent lag of 225ms after you press the button all the way down. An eternity.
- Not confirmed, but it looks we have also a ~100ms of the delay in the EVF. I can't measure this, but is there for sure !
- If you have noticed we have about 1 to 3s between each shot. Pretty slow.

Fuji :angry: ?! Its time to release a firmware fix for this as I'm missing decisive moments and my kinds are growing !!!
  • jknights, click() and flysurfer like this

#2 flysurfer

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Posted 03 June 2012 - 04:34 PM

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#3 EvilTed

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Posted 03 June 2012 - 06:41 PM

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#4 flysurfer

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Posted 03 June 2012 - 07:51 PM

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#5 Arjay

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Posted 03 June 2012 - 11:47 PM

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#6 Machspeed

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Posted 04 June 2012 - 12:50 AM

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#7 WillemH

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Posted 04 June 2012 - 01:22 AM

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#8 Ivophoto

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Posted 04 June 2012 - 01:23 AM

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#9 markopa

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Posted 04 June 2012 - 01:32 AM

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#10 Machspeed

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Posted 04 June 2012 - 02:05 AM

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#11 markopa

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Posted 04 June 2012 - 02:16 AM

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#12 Machspeed

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Posted 04 June 2012 - 02:47 AM

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#13 Sergio

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Posted 05 June 2012 - 10:15 AM

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#14 flysurfer

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Posted 05 June 2012 - 10:22 AM

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#15 jknights

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Posted 05 June 2012 - 10:43 AM

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