locsta
Posts: 288
Joined: Fri Sep 08, 2006 9:53 am

High FPS Camera Question?

Thu Mar 11, 2010 4:00 am

Hi,

Does anyone know the amount of time it takes for the shutter to close and open again during a high speed burst (10fps)?
In particular, the 1D mk III.

I imagine no matter what shutter speed you use there will be the constant of the actual time it takes the shutter to close and reopen for the next exposure, or is it somehow connected to the selected shutter speed?

Cheers,

Kevin
Missed 4 chasing 1
 
Stealthz
Posts: 5550
Joined: Wed Feb 02, 2005 11:43 am

RE: High FPS Camera Question?

Thu Mar 11, 2010 5:19 am

Quoting LOCsta (Thread starter):
Does anyone know the amount of time it takes for the shutter to close and open again during a high speed burst (10fps)?
In particular, the 1D mk III.

The Canon 1D MkIII white paper ( Available here http://www.usa.canon.com/uploadedima...ite%20Papers/EOS-1D_MarkIII_WP.pdf ) states the following-

Quote:
Shutter release time lag approx. 55 ms. (approximately 40 ms. at maximum aperture with C. Fn IV -13-1) and viewfinder blackout time 80 ms. at 1/250 or higher

I am not sure that exactly answers your question but is likely as close an answer as you might get(or need)

Cheers
If your camera sends text messages, that could explain why your photos are rubbish!
 
oly720man
Posts: 5801
Joined: Fri May 21, 2004 7:13 am

RE: High FPS Camera Question?

Thu Mar 11, 2010 10:29 am

What you need is a calibrated spinning disk, or similar moving object, and from the position of the markings you could work out the time between shots.

But if it says 10fps then I'd expect the shutter to open every 1/10 sec, as long as the shutter speed is faster than that, so the time between shots will be 1/10s minus the shutter speed used.
wheat and dairy can screw up your brain
 
AndyEastMids
Posts: 1069
Joined: Wed Jan 24, 2001 10:24 pm

RE: High FPS Camera Question?

Thu Mar 11, 2010 2:33 pm

Quoting LOCsta (Thread starter):
I imagine no matter what shutter speed you use there will be the constant of the actual time it takes the shutter to close and reopen for the next exposure, or is it somehow connected to the selected shutter speed?

Most shutters don't open completely at higher shutter speeds (usually above 1/250sec or so)... The two shutter curtains move in parallel a certain distanceapart (from top-to-bottom or side-to-other-side depending on whether its a vertical or horizontal shutter mechanism), exposing just a section/slot of the film or sensor as they move - imagine the shutters as being two curtains, one starting to travelling first and uncovering a part of the width or height of the sensor, and then the second one starting travelling very shortly afterwards, resulting on a portion of the sensor/film - either a vertical or horizontal slot - being exposed at any given moment.

This is why flash will not sync at all shutter speeds - the fastest shutter speed that results in the entire frame being open at once is best flash sync speed. Because the duration of the flash is very brief, any shutter speed above that exposing the entire frame at once would result in a portion of the image being covered by the shutter blades at the time the flash fired.

Having said that, there is the time it takes for the shutter curtains to move back to their start position having previously moved across the frame during the exposure, which will form a lag before the next photo can be taken.

Andy

[Edited 2010-03-11 06:34:45]

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