Video and shutter count
May 21, 2015 08:24:57 #
jerryc41 wrote:
Mirror flips up - no shutter action.
Trying to get back on the subject if that is possible. I do not understand video and am trying to figure this out. Video, as I know it, is made up of still images. Generally at the rate of 30 frames per second. If the shutter stays open, how are the frames isolated? If the shutter stays open, it seems to me that everything would be a blur from the movement or overexposed.
Hoping that I can get some help and not end up with off topic chat.
May 21, 2015 09:29:36 #
David Kay wrote:
Trying to get back on the subject if that is possible. I do not understand video and am trying to figure this out. Video, as I know it, is made up of still images. Generally at the rate of 30 frames per second. If the shutter stays open, how are the frames isolated? If the shutter stays open, it seems to me that everything would be a blur from the movement or overexposed.
Hoping that I can get some help and not end up with off topic chat.
Hoping that I can get some help and not end up with off topic chat.
The sensor samples the image at the specified frame rate. Think of it as the shutter staying open and the sensor turning on and off.
May 21, 2015 09:58:34 #
LFingar wrote:
The sensor samples the image at the specified frame rate. Think of it as the shutter staying open and the sensor turning on and off.
Very unique process this digital stuff. :) Quite different from the old movie camera. LOL
May 21, 2015 10:00:21 #
OK, sticking to the subject, LFingar is correct. When you shoot a long exposure (non video) the mirror flips up and the sensor records a single exposure, including movement and blur until the mirror drops. With video, the mirror goes up, exposing the sensor, which electronically goes on and off, creating a series of "captures" or frames.
I did not learn that at Best Buy. :)
I did not learn that at Best Buy. :)
May 21, 2015 10:59:11 #
David Kay wrote:
Very unique process this digital stuff. :) Quite different from the old movie camera. LOL
My explanation was quite simplified. I doubt that the sensor actually turns on and off. It probably stays on throughout the video shoot with the processor grabbing the images at the appropriate intervals to produce the frame rate. That would also explain why on some cameras sensor heat was an issue, although that particular problem seems to have been overcome.
May 21, 2015 11:39:46 #
David Kay wrote:
Very unique process this digital stuff. :) Quite different from the old movie camera. LOL
Yeah, can you imagine your DSLR mirror slamming away at 60 cycles per second? ;)
May 21, 2015 12:07:59 #
OddJobber wrote:
Yeah, can you imagine your DSLR mirror slamming away at 60 cycles per second? ;)
With it flapping like that I can just picture the camera lifting off and flying away! With the photographer chasing after it! :shock:
May 21, 2015 15:30:03 #
jerryc41 wrote:
Ooooh! You got me! :D
I wish you'd hire more help in your store. You're not posting enough any more.
I wish you'd hire more help in your store. You're not posting enough any more.
Jerryc41 said:
"You're not posting enough any more."
He's got a way to catch up to the poster with the mostest. Only 17,113 to your UHH high of 50,325.
Also, he has a theoretical disadvantage because of his time zone.
May 22, 2015 02:07:00 #
The sound of 60 or even 30 shutter actuations per second
is something Id like to hear :-)
is something Id like to hear :-)
Jun 16, 2016 08:30:46 #
jerryc41 wrote:
Mirror flips up - no shutter action.
Now that makes sense.
Jun 16, 2016 11:07:32 #
So, along that same thought then...
If shooting with live view, does each image taken count as a shutter actuation since the mirror doesn't flop up and down?
If shooting with live view, does each image taken count as a shutter actuation since the mirror doesn't flop up and down?
Jun 16, 2016 11:40:33 #
For still image. The sensor is reset and then exposed to the image formed by the lens. After the shutter close the A/D conversion circuit will readout row by row and save in memory. The sensor is then reset ready for next shot.
For video the sensor is continuosly exposed. The A/D circuit would readout one row and clear it for the next frame. After the last row is done it starts again for the new frame.
For video the sensor is continuosly exposed. The A/D circuit would readout one row and clear it for the next frame. After the last row is done it starts again for the new frame.
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