jfulton wrote:
Hmm. It's unfortunate that we can't shoot slower than 1/30th. I actually shoot my HD cam (720/60p) at 1/15 and 1/7.5 for effect, to raise the ambient light level on a dark and static scene, or to eliminate computer screen flicker.
With any professional video camera, it is not a good idea to shoot at shutter speeds higher than 1/60 under fluorescent lights as you will have a noticeable roll on your white balance. I'm assuming it is true of the 5DmkII. Can anyone vouch for this??
i got roll last night from my LCDs projecting out light into a dark room at anything faster than 1/40th actually.
If you shot at 1/15th and 1/7.5 I assume that HD cam then has adjustable frame rate and lets you go lower than 24fps? Because it is impossible to havea longer exposure time than 1/fps.
skibum5 wrote:
i got roll last night from my LCDs projecting out light into a dark room at anything faster than 1/40th actually.
If you shot at 1/15th and 1/7.5 I assume that HD cam then has adjustable frame rate and lets you go lower than 24fps? Because it is impossible to havea longer exposure time than 1/fps.
Not entirely sure how it works. But it does keep it at 60 fps. I'd have to upconvert + render those clips if it didn't when editing on a 60fps timeline in FCP.
jfulton wrote:
With any professional video camera, it is not a good idea to shoot at shutter speeds higher than 1/60 under fluorescent lights as you will have a noticeable roll on your white balance. I'm assuming it is true of the 5DmkII. Can anyone vouch for this??
Sure can.
At 1/50th of a second, here in Australia, I'm seeing the rolling effect. And we're at 50hz here....
It's not visible at 1/30th.
Am I right in assuming that either my lights are weird or Canon's 1/50th isn't spot-on?
skibum5 wrote:
If you shot at 1/15th and 1/7.5 I assume that HD cam then has adjustable frame rate and lets you go lower than 24fps? Because it is impossible to havea longer exposure time than 1/fps.
skibum5 wrote:
...If you shot at 1/15th and 1/7.5 I assume that HD cam then has adjustable frame rate and lets you go lower than 24fps? Because it is impossible to havea longer exposure time than 1/fps.
That's what I thought, too, until today. Then I read this:
"One of the hazards of using a shutter speed other than 1/60th of a second is that the resulting image may look unnatural. Your television is playing back 60 images a second. If the camera's shutter speed is set to 1/15th of a second...one exposure is covering four frames of time. A quickly moving object will appear as a series of strobed, blurred frames."
BrianO wrote:
That's what I thought, too, until today. Then I read this:
"One of the hazards of using a shutter speed other than 1/60th of a second is that the resulting image may look unnatural. Your television is playing back 60 images a second. If the camera's shutter speed is set to 1/15th of a second...one exposure is covering four frames of time. A quickly moving object will appear as a series of strobed, blurred frames."
At 1/50th of a second, here in Australia, I'm seeing the rolling effect. And we're at 50hz here....
It's not visible at 1/30th.
Am I right in assuming that either my lights are weird or Canon's 1/50th isn't spot-on?
well here in the states i had to go to 1/30th or 1/40th to 100% stop any of the effect coming of my LCD (one has a double rate bulb though 120Hz not 60Hz)
BrianO wrote:
Apperently so. I Googled it a few minures ago, and that's what I read.
I've only shot motion pictures on film, so the concept seems very strange to me. I guess I'll have to study up on video technology.
It's scanning every other line anyways, so the images are constructed. If there were never film movie cameras the concept of shutter for digital motion picture might not exist.
Well, my 5DmkII went on the fritz an hour or so after loading the firmware last night. Thick banding/lines appeared horizontally across the video (could see during recording). It was more pronounced when using faster shutter speeds (which may be shutter related). I shot HD, then shot SD, then mounted a 50/1.4 and it all started to go down hill. It still appeared after removing the battery, re-installing the firmware, resetting all functions, to no avail. I returned my camera today for a new copy.
Before I re-install the new firmware, has anyone experience any like issues??
jfulton wrote:
Well, my 5DmkII went on the fritz an hour or so after loading the firmware last night. Thick banding/lines appeared horizontally across the video (could see during recording). It was more pronounced when using faster shutter speeds (which may be shutter related). I shot HD, then shot SD, then mounted a 50/1.4 and it all started to go down hill. It still appeared after removing the battery, re-installing the firmware, resetting all functions, to no avail. I returned my camera today for a new copy.
Before I re-install the new firmware, has anyone experience any like issues??
sounds like you are shooting near fluorescent lighting of some sort, even light shining off LCD monitors and TVs can cause that.
Drop shutter to 1/30th or 1/40th and I bet it goes away or go shoot outside under the sun or turn off the fluorescent lighting and any LCD projecting a significant percetange of the room lighting.
If that is what it is then it is 100% normal (and since you mention last night that implies indoor lighting so I bet you had some LCD shine or some fluorescent overheards or those energy saver compact fluorescents on and that is all it was, nothing wrong with your 5d).
Could have been. Unfortunately it showed up under normal tungsten lighting as well (where it had no problems before). Hopefully this new body won't show issues. If it does, I'll pay more attention to exactly which light source/shutter speed combo I'm using.
