GH4 Beginner Question: 4K 24P - How to Control Exposure?
- Thread starter Redoak
- Start date
Smoother looking as in motion or in the texture of the image?
You've got the right idea that you don't want to be mucking around with shutter speed to adjust exposure. Invest in a good variable neutral density filter, which will allow you to cut the amount of light coming in without adjusting the aperture (which changes the "look"). Then you can pick an aperture that gives you the desired look, pick an ISO as low as possible, and use the ND filter if there's still too much light coming in.
Thank you linuxizer - great advice. What about the setting the shutter at 180 and 1/40th sec as others have suggested?
thorn
Active member
abreu-canedo
Well-known member
The term shutter angle comes from the days of film when there was an element spinning in between the lens and the film. The angle of the opening determined the shutter speed at a given frame rate.
For digital, this translates roughly to doubling your shutter speed...so to speak. If you're at 50fps, set your shutter speed to 1/100ths. If at 25fps, shuttle speed should be set at 1/50ths of a second. This relation between frame rate and shutter speed will render results similar to 180 degree shutter angle...slight motion blur and smoother motion from frame to frame.
Now, for some action or sports, you want to have a faster shutter speed, in order to slightly remove blur and capture more detail. I find it helpful to also raise shutter speed for slow motion work at frame rates higher than 72fps or so. But that's not a rule. Actually, none of this is.
As far as exposure, one would greatly benefit from exposure tools such as histogram, waveform, or even just an oldschool light meter. Determine what depth of field you want for a given shot, and then adjust the rest accordingly...if you can.
For digital, this translates roughly to doubling your shutter speed...so to speak. If you're at 50fps, set your shutter speed to 1/100ths. If at 25fps, shuttle speed should be set at 1/50ths of a second. This relation between frame rate and shutter speed will render results similar to 180 degree shutter angle...slight motion blur and smoother motion from frame to frame.
Now, for some action or sports, you want to have a faster shutter speed, in order to slightly remove blur and capture more detail. I find it helpful to also raise shutter speed for slow motion work at frame rates higher than 72fps or so. But that's not a rule. Actually, none of this is.
As far as exposure, one would greatly benefit from exposure tools such as histogram, waveform, or even just an oldschool light meter. Determine what depth of field you want for a given shot, and then adjust the rest accordingly...if you can.
Using 180 degree setting keeps your shutter speed at roughly double the frames per second you are shooting at. It best to use shutter angle as opposed to shutter speed, so if (and I really mean when) you use the variable frame rate feature of the GH4 to get great slow motion, you don't have to calculate what the shutter speed needs to be changed to, and more importantly, don't have to worry about changing it back for shooting 24p.
This is the very reason why I use shutter angle over shutter speed, as I was experimenting with slo-mo and forgot to change my shutter speed back to 1/50, and was wondering why my exposures all seemed off for a real shoot I was doing.
This is the very reason why I use shutter angle over shutter speed, as I was experimenting with slo-mo and forgot to change my shutter speed back to 1/50, and was wondering why my exposures all seemed off for a real shoot I was doing.