Sekonic L-758cine and Shutter Speed

drewmaw

drewmaw

Well-known member
Hey guys,

I've been trying to figure out how to use Shutter Speed, opposed to Shutter Angle on my Sekonic L-758cine in cine mode (i.e. f/s mode). I know the Spectra IV does it. Does the L-758cine do it? It's difficult to figure out the calculations from angle to speed on set. I've been shooting on the Canon 7D and RED ONE, and sometimes I like to shoot at a super fast shutter speed if the director wants it. Thanks!

Drew.
 
I don't understand quite what you're asking.

In the case of the 7d wouldn't you just set the shutter speed on the Sekonic equal to the shutter speed on the 7d?

If you're asking for it to convert for you then there's no reason, if you're looking an angle, dial in an angle, if you're looking for a shutter speed, dial in a shutter speed.
 
are you asking how to convert shutter angle numbers to shutter fractions because the light meter is in one while the camera reads the other way of measurement? (or vice versa)

Because that is simply just a conversion. No biggie.
 
Found this online...

Default Exposure Time - Speed vs Angles
Following up on the question about exposure time when in ramps, here is a quick comparison of exposure times when expressed in 1 / xx seconds v’s xx degrees. Calculations are at 24 fps.

If you want to convert shutter speed to shutter angles at 24 fps the math is:
(24 x 360) / Time Fraction (i.e 8640 / xx where xx is 1/ xx sec)

So the equivalent shutter angle for 1/50 sec shutter speed is:
8640 / 50 = 172.8 (i.e 172.8 degrees)

Here’s a handy cheat sheet with seconds and the equivalent conversion in degrees:
1/32 = 270
1/48 = 180
1/50 = 172.8
1/60 = 144
1/96 = 90
1/120 = 72

The camera’s Sync Scan function permits any shutter speed in the range 1/32 - 1/2000 (or equivalent angles) - i.e these are not preset speeds but fully variable.

To find a shutter speed that relates to a known shutter angle, do the math in reverse. At 24 fps the equation would be:
(24 x 360) / Shutter Angle (i.e 8640 / xx where xx is xx degrees).

So the shutter speed for 144 degrees:
8640 / 144 = 60 (i.e 1/60th sec)

Another cheat sheet with degrees and the equivalent conversion to seconds:
270 = 1/32
180 = 1/48
178.8 = 1/50
144 = 1/60
90 = 1/96
72 = 1/120
45 = 1/198
22.5 = 1/348
11 = 1/696
8.6 = 1/1000
Click to expand...
 
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