HVx-200 and Shutter Speed options

S

samyork21

Member
I have a question, I have been messing around with the shutter options and realized that you get better detail at 1/64 instead of 180.0 shutter speed. Why is that?

I can't remember the order of the shutter speeds, but I think it is 1/24, 1/60, 1/120, 1/250, 1/500, 1/1000 sec. At 1/1000 the iris is closed more right? what are they all for?

Its seems like at 1/24 you get more detail. and if you are recording 720/24pn at 1/60 shutter or 1/250 it seems like the subject is strobing and moving faster. I swear it looks like most action films when they are fighting or running or car scenes. Is this what they do? Or do they actually bring down the frame rate to like 18 fps or 22 fps for that kind of stuff?

Or I'm I wrong about everything? Does anyone know some tips about shutter speeds that can add to a scene or enhance a subject.

thanks a lot
 
Sam,

Here is some summarized information that will hopefully help answer your questions.

For those of you more knowledgeable types who are reading, please remember that this is meant only as a primer. I acknowledge that much more (volumes) can be said.

1. Detail

Let's assume you have your FPS set to 24. A 180 degree shutter angle yields a 1/48 shutter speed. This is obviously slower than 1/64.

The slower your shutter speed, the brighter the image and the more motion blur you will see. This explains why the 1/64 shutter speed footage is sharper than 1/48.

2. Shutter Speeds and Iris

The iris (also known as aperture) is neither more closed nor open as shutter speed changes - it is something completely different. When you use a faster shutter speed, there is less time for the camera to take in light using the particular iris setting. This means that using a faster shutter speed for any given iris setting requires a brighter environment.

The corollary of this is that where you have too much light, you can use a faster shutter speed to reduce overexposure. And where you have too little light, you can try using a slower shutter speed to reduce underexposure.

The problem with using shutter speed to tailor brightness is the introduction/elimination of motion blur. If you have more than a little motion in your scene, changing the shutter angle will affect how natural the motion looks. A shutter angle which is too high will produce too much blur, and one that is too low will result in strobing (aka the "Saving Private Ryan" effect).

The iris will affect both your exposure and your depth of field, but will not affect the amount of motion blur you see in your footage. This is why you should first rely on the iris if all you are doing is trying to get the correct exposure.

Although the camera provides a limited number of different shutter speeds, by understanding and using the shutter angle settings you can fine tune the shutter speeds (and thus do not have to rely on the presets).

The formula for shutter speed is: 1/[(360/X) * Y],

where X is shutter angle and Y is your frame rate.

Thus, if you have a shutter angle of, say, 90 degrees and a frame rate of 24 fps, you will have a shutter speed of:

1/[(360/90) * 24] = 1/96 sec.

3. Frame Rate

Changing the frame rate using one of the camera's native modes will allow you to create slow or fast motion. But using variable frame rates will not allow you tailor brightness or motion blur - that is what shutter angle does for you.

PLEASE NOTE: The foregoing discussion only applies where the camera is in FILM CAM mode. It does not apply where the camera is in VIDEO CAM mode.
 
Thanks!




Nexis said:
Sam,

Here is some summarized information that will hopefully help answer your questions.

For those of you more knowledgeable types who are reading, please remember that this is meant only as a primer. I acknowledge that much more (volumes) can be said.

1. Detail

Let's assume you have your FPS set to 24. A 180 degree shutter angle yields a 1/48 shutter speed. This is obviously slower than 1/64.

The slower your shutter speed, the brighter the image and the more motion blur you will see. This explains why the 1/64 shutter speed footage is sharper than 1/48.

2. Shutter Speeds and Iris

The iris (also known as aperture) is neither more closed nor open as shutter speed changes - it is something completely different. When you use a faster shutter speed, there is less time for the camera to take in light using the particular iris setting. This means that using a faster shutter speed for any given iris setting requires a brighter environment.

The corollary of this is that where you have too much light, you can use a faster shutter speed to reduce overexposure. And where you have too little light, you can try using a slower shutter speed to reduce underexposure.

The problem with using shutter speed to tailor brightness is the introduction/elimination of motion blur. If you have more than a little motion in your scene, changing the shutter angle will affect how natural the motion looks. A shutter angle which is too high will produce too much blur, and one that is too low will result in strobing (aka the "Saving Private Ryan" effect).

The iris will affect both your exposure and your depth of field, but will not affect the amount of motion blur you see in your footage. This is why you should first rely on the iris if all you are doing is trying to get the correct exposure.

Although the camera provides a limited number of different shutter speeds, by understanding and using the shutter angle settings you can fine tune the shutter speeds (and thus do not have to rely on the presets).

The formula for shutter speed is: 1/[(360/X) * Y],

where X is shutter angle and Y is your frame rate.

Thus, if you have a shutter angle of, say, 90 degrees and a frame rate of 24 fps, you will have a shutter speed of:

1/[(360/90) * 24] = 1/96 sec.

3. Frame Rate

Changing the frame rate using one of the camera's native modes will allow you to create slow or fast motion. But using variable frame rates will not allow you tailor brightness or motion blur - that is what shutter angle does for you.

PLEASE NOTE: The foregoing discussion only applies where the camera is in FILM CAM mode. It does not apply where the camera is in VIDEO CAM mode.
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