Exposure and 24p 1/50

M

Mojito

Hey guys,
Pretty new to DSLR filming so advanced apologies.

I have my 7D set up at 1080p 24p 1/50 ISO 125 using a Tokina 11-17 and a Craft Works MKII ND Filter and i am having to max out the ND Filter to get the exposure on target in sunny weather.

In very bright sun (aimed in the sky), it becomes slightly over exposed, but i am unable to correct this whilst keeping the 24p 1/50 settings.

Is there something i am doing wrong or is it that the ND Filter is not good enough for what i am using it for?

Thanks.
 
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ClockworkNinja said:
The rule of thumb is f/8 and forget it for sunny weather, but anything between f/7 and f/11 should be good enough depending on your other variables as far as your aperture goes.
Click to expand...


This is not true for every lens. It's a general rule for when you don't know.


for the Tokina (it's the 11-16, not 17) f2.8 is pretty crazy already. But in sunny time you can lower it (don't go after 11) and if it's still not enough (supposing your iso is at 100), don't hesitate to bring down the shutter speed. The 180 rule is not really important.
 
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I think he was refering to me as I said that.

Higher shutter speed just takes off a bit of the motion blur. I've seen so many people on Vimeo ignoring the 180 rule and having super beautiful footage.
 
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Sure people can set what ever SS they want, but it does have an effect on motion in the image. It should be manipulated for a creative purpose, not to correct for lighting conditions. Otherwise untended consequences will result. Imagine what happens if you adjust SS to make up for LOW lighting..
 
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You DO NOT know what that footage really looks like at the time you are shooting it. You will potentially get into the edit and it will look stroby and odd, especially cut with footage you shot at the correct shutter speed.

Around 100 years now, that's how long people have been shooting films. Rules don't become rules for no reason. There are times it might well be OK, but to say that it really doesn't matter and just don't worry about it, is really really really bad advice.
 
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I've shot a lot of footage at 1/100. For really slow-moving scenes (dialog-heavy), honestly, nobody can notice, except for maybe DPs. For action-scenes, the difference is rather pronounced. I think even non-filmmakers can tell that something is just...off.

There was a ways back when we had a BIG-ol' debate on the merits of the 180-rule. I really just wanted someone to explain to me WHY we followed it -- what was the link between shutter speed and frame rate?

The general consensus we reached is this -- there is no link between shutter speed and frame rate (except that your shutter speed obviously can't be slower than your frame rate). The 180 rule exists simply because of the history of how cameras were made, and more importantly -- audiences have grown accustomed to it. As a general rule, it's good to keep your shutter speed at or near 1/50 or 1/60, simply because it creates a motion blur that audiences accept as normal, and anything different will weird them out, consciously or not.

Disclaimer: there's always an exception to the rule, Private Ryan, yadda yadda. :)

Anyway, to answer the OP's question -- if you can't up your f-stop, yeah, you're gonna need more ND filters. Keep in mind that this of course is gonna keep you at a really shallow depth of field; maybe you want that, maybe you don't.
 
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order of operations?

Decide your shutter speed based on the look you want.
Decide your fstop based on the depth of field you want.

Set your SS as decided
Set you fstop as decided
Look through the viewfinder and check the exposure:
If its too dark add some light
If its too bright take away some light.
  • literally take away the light, using flags, scrims etc..
  • use ND filters to lower the light amount entering the lens


Now, if your not dead set on a specific DOF, then you can try lowering or raising the fstop to see if you can get the exposure right. Understanding that doing so will change the DOF.
 
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I went with 1/50 for 24p for most of my footage. I feel like it's a tiny bit soft. I think we are trending away from the look really. Folks are getting so many impressions on clearer and more definition the old style rules will feel fairly dated in a few years.
 
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