Blair S. Paulsen
Well-known member
- Joined
- Dec 28, 2006
- Messages
- 5,503
- Reaction score
- 34
- Points
- 48
- Location
- San Diego, CA
- Website
- www.alacritymedia.com
Motion Mount love
Motion Mount love
While the convenience and hoped for neutrality of the motion mount is welcome, it also does something far more important:
The Motion Mount produces a sine wave shaped shutter characteristic similar to the Tessive Time Filter Tony Davis developed. Imagine a 180° shutter at 24 fps with a typical square wave shutter characteristic, like a row of teeth with every other tooth missing - during the time the shutter is open exposure of elements in motion and/or camera movement is captured with the motion blur evenly distributed in terms of density from the beginning until the end of the open time period, typically 1/48th of a second, picking up where the last frame "left off" positionally. This virtually instantaneous on/off property promotes easily perceived "judder", also referred to as strobing, because the eye has to "jump" the positional changes that happen while the shutter is closed.
With a sine wave shutter characteristic the shutter is only completely closed for an instant, with the exposure rising and falling over the "open" period of 1/24th of a second (assuming 24fps) such that the same amount of total exposure occurs one would have with a square wave. The difference is that exposure is distributed over time so that early in the "open" period the light hitting the sensor is less so the motion blur is more transparent, in the middle of the open period the exposure is greatest resulting in the strongest contribution to the frame with the most density, then as the "open" period is ending the density fades proportionally.
The effect of this is the the eye tends to track the position at the height of the open time period with just enough exposure during the time in between the peaks to provide a more faintly represented and motion blurred presentation of what would otherwise be missed during the closed portion of a square wave shutter. This yields a much smoother motion characteristic that one might describe as "more organic" and highly resistant to perceivable judder. IMO it also increases apparent resolution of shots with moving elements or moving camera as the "peak" exposure moment has more defined edges than the time in between allowing it to step "up front" visually.
For shots with a lot of movement, motion representation should be far more natural and much easier for the eye to track. IMO, this is a BIG DEAL.
Cheers - #19
Motion Mount love
While the convenience and hoped for neutrality of the motion mount is welcome, it also does something far more important:
The Motion Mount produces a sine wave shaped shutter characteristic similar to the Tessive Time Filter Tony Davis developed. Imagine a 180° shutter at 24 fps with a typical square wave shutter characteristic, like a row of teeth with every other tooth missing - during the time the shutter is open exposure of elements in motion and/or camera movement is captured with the motion blur evenly distributed in terms of density from the beginning until the end of the open time period, typically 1/48th of a second, picking up where the last frame "left off" positionally. This virtually instantaneous on/off property promotes easily perceived "judder", also referred to as strobing, because the eye has to "jump" the positional changes that happen while the shutter is closed.
With a sine wave shutter characteristic the shutter is only completely closed for an instant, with the exposure rising and falling over the "open" period of 1/24th of a second (assuming 24fps) such that the same amount of total exposure occurs one would have with a square wave. The difference is that exposure is distributed over time so that early in the "open" period the light hitting the sensor is less so the motion blur is more transparent, in the middle of the open period the exposure is greatest resulting in the strongest contribution to the frame with the most density, then as the "open" period is ending the density fades proportionally.
The effect of this is the the eye tends to track the position at the height of the open time period with just enough exposure during the time in between the peaks to provide a more faintly represented and motion blurred presentation of what would otherwise be missed during the closed portion of a square wave shutter. This yields a much smoother motion characteristic that one might describe as "more organic" and highly resistant to perceivable judder. IMO it also increases apparent resolution of shots with moving elements or moving camera as the "peak" exposure moment has more defined edges than the time in between allowing it to step "up front" visually.
For shots with a lot of movement, motion representation should be far more natural and much easier for the eye to track. IMO, this is a BIG DEAL.
Cheers - #19
