What else is happening before the first curtain on E-M1?

Started 4 months ago | Discussions thread
Ken Strain
Regular MemberPosts: 222
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Re: Shutter video
In reply to radsaq, 3 months ago

radsaq wrote:

Anders W wrote:

radsaq wrote:

If the shutter is cocked and then reopened immediately before the sensor is reset, doesn't that mean the entire process could be done in the same time that a normal shutter cycle occurs? The shutter will normally be waiting some number of milliseconds in the cocked (closed) state to let the sensor reset happen before it opens. As far as we can surmise, it's not, and so that has effectively freed up that same interval to be used for the same step, just in a different order. Right?

I would hope you are right but I am not so sure about that. I don't think the first mechanical curtain really needs to wait for the sensor to reset, at least if they've programmed things optimally from the beginning. It will take the mechanical shutter about 1/320 s to close its first curtain (since that's about how fast the blades can move on the E-M1) and in order for the EFCS to sync with the second curtain, the sensor must have the capability to reset within the same interval.

We also have the observations to which I link below from another thread:

http://www.dpreview.com/forums/post/53418777

So a slight delay compared to mechanical shutter only (but less than the 1/8 s minimum of earlier anti-shock settings) seems likely at this stage. That said, I'll be more than happy if anyone can prove me wrong.

Here's a comparison of the sound of two 1/160s exposures in manual/MF with IS off. The EFCS is on top:

Looks like it's an additional 25ms of shutter lag?

Nice measurements!  You seem to have managed to avoid echoes, which is not easy.

Ken

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