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

Started 6 months ago | Discussions thread
Anders W
Forum ProPosts: 17,966Gear list
Like?
Re: Shutter video
In reply to radsaq, 5 months ago

radsaq wrote:

Anders W wrote:

simpy wrote:

Jim Salvas wrote:

I just took that clip into iMovie, where I can slow it down to frame by frame. It definitely seems as if the first curtain is closing and then opening again, but it sure is fast. When you listen to it frame by frame, there are quite a few shutter sounds going on.

Could it be that the physical shutter sequence is not altered, but the electronic shutter makes it possible to adjust the timing of the actions?

For example, the initial curtain could close and reopen as quickly as possible, before the camera/sensor is ready to shoot. That might give a few milliseconds for things to settle down before the electronic shutter starts exposure.

Yes, it could be like that. And I think it's the best guess I can make after seeing Jim's video. There is no way to download it from youtube or viewing it frame by frame on youtube, is there?

It could be that the mechanical shutter is so constructed that there is simply no way to use the second curtain only so that they have to go through the entire sequence.

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. 

 Anders W's gear list:Anders W's gear list
Panasonic Lumix DMC-G1 Olympus OM-D E-M5 Olympus E-M1 Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS Panasonic Lumix G Vario 7-14mm F4 ASPH +21 more
Reply   Reply with quote   Complain
Post (hide subjects)Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow