Here's another dumb question; 180 degree?

RieniO

RieniO

Well-known member
This is another thing that's totally new to me, since I come from videocamera land.

I have no clue what "180 degree shutter" stands for. I see this option in the shutter rate menu when the camera is in film mode. What does this mean exactly and does this mean that the AF100 has a mechanical shutter or is it some kind of electronic simulation? There is probably info about this on the web but google brings up so much crap nowadays so a useful link would be great too.
 
You're still changing the shutter speed - 1/48 being 180 degrees for 24 frames per second.
 
So is this the setting I should chose when shooting VFR? Whatever frame rate I pick, the shutter speed will always be right? For example I don't want to shoot 50fps with a shutter speed of 1/25, right?
 
Based on what I read in Barry's book I don't believe you can choose a shutter speed that's slower than the frame rate.
 
you oculd but youd be shooting half the frames
shooting 1/12 on 24p would be 12 frames recorded on a 24p time
 
the degree shutter is an historic thing coming from the old mechanical technology.
old style camera have a circular shutter that is made from a round mirror that has a slice cut into.
Look at it like an apple pie where you cut slice.
The target of doing so is to get the mirror part reflecting the picture into the viewer, and the windows sclice passing
light to film.
On camera without "live view" there is even no mirror part, just a black surface.
So a 180 degree slice means you cut half of the pie (from noon to six if you prefer the clock analogy).
The advantage of this is whatever the speed of the film, you know how much light is going to film.
since the wheel make one turn per image.
for a 24 fps, you then got 1/24 of sec to make a full rotation, then if only half of it transparent, it means
you get a shutter working at 1/48.
since with digital camera you get that rolling shutter stuff, there are limitation on the ratio you can use,
but with film camera, you can set any realistic value (like 80 degree) if you want.
 
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