7 ms·
It’s not a “very SLIGHT improvement” as you write. It’s VERY SIGNIFICANT. Even the Nikon Z9 has roughly 4ms rolling shutter speed. Light travels faster than you
by lvl102 3y ago
It’s not a “very SLIGHT improvement” as you write. It’s VERY SIGNIFICANT. Even the Nikon Z9 has roughly 4ms rolling shutter speed. Light travels faster than you imply here. A lot faster.
- sixothree 3y agoAt 120 fps that’s half the frame time and probably the entire shutter time.
- davidgay 3y agoThe Z9 has no (mechanical) shutter.
- sixothree 3y agoI mean is 1/250 "shutter speed" which seems more normal for lighting than 1/120. But I guess for video it doesn't matter and could be 1/120.
- yakubin 3y agoFor video you typically set shutter speed to half a frame. The most common frame rate is 24FPS, so you get 1/50 shutter speed. It’s lousy for a photo, but good for video , since you want motion blur, so that the video isn’t janky. You control light through ND filters and LED/tungsten lights, not through shutter speed, since shutter speed affects motion blur and you want to make that choice independently of exposure. 120FPS is good for sports or wildlife, but those are special. For normal stuff, 24FPS is good. And even with wildlife, you’re probably not recording at 120FPS all the time, only during quick action. Otherwise you’re just wasting space on your memory card with identical frames. Battery as well.
- AnimalMuppet 3y agoIt's not the speed of light that matters. It's the speed of objects in the field of view (or, more specifically, the speed of their image on the sensor compared to the speed of the shutter across the sensor).
- zero_iq 3y agoAlso worth noting that, unlike physical objects, images are not bound by the speed of light. Patterns of light and shadow can move across a sensor at unrestricted speeds.
- neogodless 3y agoI'm confused what this means. Are patterns of light and shadow not also light, and bound by the speed of light (on the upper end)? How can patterns consisting of light (or the absence of it) move faster than light?
- yakubin 3y agohttps://physics.stackexchange.com/a/48329 https://physics.stackexchange.com/a/48329 In other words, speed of a projection of light from 3d space to 2d space may be higher than the original speed in 3d. (Because one dimension gets squished to 0, so movement in this dimension is perceived to be instant.) It's like a diagonal of a cube 1x1x1 has length sqrt(3), but if you apply orthogonal projection onto R^2, its image will be a diagonal of a square and it will have length sqrt(2). Shorter distance -> shorter time to travel.
- jmholla 3y ago> It's like a diagonal of a cube 1x1x1 has length sqrt(3), but if you apply orthogonal projection onto R^2, its image will be a diagonal of a square and it will have length sqrt(2). Shorter distance -> shorter time to travel. This example doesn't make sense to me. In that analogy, wouldn't anything on that diagonal appear to move more slowly in 2D than the same thing moving along the diagonal of a face? The cube diagonal would make it move farther than it does in 2D space. I remember seeing a simulator in my optics class that combined multiple wavelengths of light. The interference pattern moved faster than the speed of light, but that was fine because information wasn't moving faster. That was just the result of adding them together.
- 3y ago