Shutter Shock - Size DOES Matter!

Started 6 months ago | Discussions thread
Anders W
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Re: Shutter Shock - Sony FF A7R
In reply to 453C, 6 months ago

453C wrote:

Anders W wrote:

453C wrote:

skyglider wrote:

kbouk wrote:

skyglider wrote:

Thinking about this shutter shock problem, more mass would dampen vibration and result in less blur. But there may be another factor in play which is sensor size. With a larger sensor, vibration is a smaller percentage of the image.

So it stands to reason that micro 4/3 sensors would exhibit more blur due to shutter shock, APS-C sensors less blur, and FF sensors the least amount of blur.

Sky

I don't think so, the new FF Sony A7R has big problems :

http://www.diglloyd.com/blog/2014/20140123_2-SonyA7R-shutterVibration-CallForAction.html

Correcto mundo. Guess with a larger sensor the shutter has to travel a longer distance which results in more impact when the shutter bottoms out, resulting in a larger shock wave. Compared to less impact on a smaller micro 4/3 sensor.

Funny how Sony knew enough to include an electronic first curtain shutter in the Alpha 7 which came "first" and made a purposeful decision to omit it in the Alpha 7R which came "second". Sony works in mysterious ways.

I don't think the distance travelled is a factor. Everything else being constant, two identical cars striking a wall at the same speed impart the same amount of force, regardless of their starting point from the wall.

Hi there. Long time no see. Glad to see ya' back.

The distance travelled is a factor in the sense that the shutter blades of an FF camera have to travel nearly twice as fast as those of an MFT shutter in order to reach the same flash sync speed. They also have to cover roughly four times the area. So everything else equal, we should expect significantly more kinetic energy and momentum at play with an FF shutter than with an MFT shutter.

Thanks. After handling an E-M1, I had to see how it was holding up for the 1041 horde.

Ah, yes, that makes sense. Throw in the necessarily larger mechanism and I can see more energy being generated, and needing to be managed. I'm guessing it's going to be easier for manufacturers to develop a fully electronic shutter than it will be to completely address shutter induced vibrations in such small cameras. At least, I hope that's the way they go.

Hopefully and probably we will eventually see a "global electronic shutter", i.e., one that can complete reset and readout for the entire frame fast enough to completely replace the mechanical shutter. In the short run, however, I think the most realistic hope is a shutter with an electronic first curtain, such as those already available on some Sony and Canon cameras.

With such a shutter, the two first phases of shutter action on a mirrorless camera (or a DSLR in live view) can be eliminated (shutter closing to reset the sensor, shutter opening for exposure) so that only the two last ones remain (shutter closing for readout, shutter opening to resume live view). Based on the tests I have seen, such a shutter comes close to completely eliminating the shutter shock issue.

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