GH3 40% Question

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Ianscreations

Well-known member
I know the general rule of thumb for shutter angle is to double your frame rate. Yes, there are many reasons to not follow this tenat, but for the purpose of this question, I wanted a bit better understanding.

I noticed the GH3 locks the 40% slo mo rate at 60fps. Why is this the case? The footage looks fantastic so I'm not sure why I would need to shoot 60fps at 1/125. Can you help me understand? And if 60fps with 1/60 works so well, why wouldn't 24fps with 1/25? This would give me a bit more exposure when shooting in low-light.
 
The shutter speed will affect motion blur. 1/48 is a standard in the movie business. So many will use this rule of thumb (shutter speed = double the frame rate) to get the same amount of motion blur.
 
There are no rules only aesthetics.

I think you will find 1/25 at 25fps has noticable blur which most would not find nice.

Certainly some shots will work at 1/25 where your other trade offs (ramping ISO) will also have a negative impact on aesthetic.

S
 
morgan_moore said:
There are no rules only aesthetics.

I think you will find 1/25 at 25fps has noticable blur which most would not find nice.

Certainly some shots will work at 1/25 where your other trade offs (ramping ISO) will also have a negative impact on aesthetic.

S
Click to expand...

So I guess to answer my own question: If I want motion blur that is typical of what the average viewer is used to, I should double the shutter speed. But if I am shooting for slow motion, motion blur doesn't matter as much so it is okay to reduce the shutter speed as long as I don't go below the frame rate. This is good to know when I am shooting in low light situations and know I will be using the footage at 40%.
 
I recently read/heard one would want faster shutter for slow mo so there IS LESS blur. because each of the individual frames is shown on screen longer than originally taken - created LESS blur, and BETTER images in slo mo. I have yet to test this, but it deoes make sense.

Your self answer makes sense as well. I don't think I've ever shot at the double frame rate shutter, because I always see the digital jitter. I'm going for slightly smoother (looks like film, maybe?) blur than digital.
 
Film with a 180 degree shutter/mirror is double the frame rate. Half exposes film, half reflects to viewfinder.
 
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