Shutter Speed in Film Cam

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danielc

Well-known member
I am wondering if someone could clarify the shutter speed on the af100 in film cam. once closed down past 180 degrees, should the motion blur not be predominant around 270 or 355 for that matter? perhaps i am missing something but for me, there isnt a lot of motion blur effect when closing down the shutter. thanks for the help.
 
Degrees work opposite to fractions in that aspect too. In fractions, the smaller the denominator, the longer the exposure time and therefore the more motion blur. So 1/60th is a longer exposure time than 1/120, and therefore has more blur.

In the angles, the smaller the number, the shorter the exposure time. 90 degrees is a much shorter exposure time than 180 degrees.
 
thanks for the replies. so my interpretation of degree shutter is correct. though im wondering if you know barry, does the af100 do a good job at recreating the motion blur effect. on my camera 270 past is not a noticeable effect, which on say my old xha1, below 1/24 the motion blur was evident. i just thought that closed it would be much greater. thanks!
 
What are some instances that you'd use angled shutter with? I've heard of it, but never owned a camera that did this until now with my AF100.
 
with the hvx and redrock, last fall i shot a lot of nature stuff for a school doc, locked off water and stream shots looked pretty with the blur, also at 12fps we had a busy city timelapse shot of our subject in the middle of the crowd. when sped up the the people at some blur or 'trail' to them. it worked well for the situations, though i dont seem to see it much yet on the af100. could be doing something wrong or it is just the way it works.
 
Jon Furtado said:
What are some instances that you'd use angled shutter with? I've heard of it, but never owned a camera that did this until now with my AF100.
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Film cameras measure their exposure time in terms of the angle of degrees of the opening in the shutter. A film camera's shutter is a rotating disc, with a wedge cut out of it. That cutout is when the light gets through, as the shutter rotates the disc covers the film, and then the cutout wedge spins by and light gets through, and then the solid part of the disc rotates by and covers it again, etc. The size of that wedge is expressed in terms of degrees of an angle, with a full circle being 360 degrees. Common film shutters will expose at around 180 degrees, ranging from around 144 to 220 degrees in total. So if you want to operate your AF100 like a film camera, and emulate a film camera with a 220-degree shutter, you'd use the syncro scan to dial in that size of a shutter opening.

The key differentiation here is that when in film cam mode, the syncro scan adjusts with the frame rate, just like a film camera would. When you run a film camera faster, the shutter disc spins faster too, which means the exposure time is less. When you run at a slower frame rate, the shutter spins slower, and the film is exposed longer. The AF100's film-cam shutter works the same way. It ensures that you'll get film-style motion blur at whatever frame rate you choose.
 
So if I want 180 degree motion blur, but want to avoid the issue with rolling bars from certain lights what should the degree be set to when using a 1/60 shutter? I noticed with 180 degree and 1/60 the motion blur doesn't appear like normal 24fps motion blur you get when shooting film at 180 degrees, or even the HVX at 180 degrees in Film Mode.
 
You cannot have 180 and 1/60 at the same time (unless shooting 30p, of course). You choose your shutter speed by EITHER choosing a fractional speed, OR by using the Syncro Scan speed.

The syncro scan angles only come into play when you use the shutter wheel to choose the Syncro Scan speed, which is found between the fastest and slowest shutter speeds (usually, it's after 1/2000 and before 1/24).
 
So what degree would you set if trying to shoot a time-lapse and wanted something close/equivalent to a 1 sec shutter?
 
You can't get that. You'd have to shoot at 1fps with a 360 degree shutter.

Best you can do is shoot interval at 1 frame and manually set the shutter to 1/2 second.
 
groveChuck, how did you get the shutter down to 1/2 in film cam? i 1/2 shutter speed only in video cam mode
 
sunny_j said:
groveChuck, how did you get the shutter down to 1/2 in film cam? i 1/2 shutter speed only in video cam mode
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Sorry, I was mistaken in my post above, I was in VIDEO CAM.

To get 1/2 sec shutter, you have to be in VIDEO CAM mode, not FILM CAM.

FILM CAM mode is for using SYNCRO SCAN (degrees) shutter.

There's no downside to being in VIDEO CAM mode in this case, since if you're you're shooting at 1/2 second shutter, you're obviously trying to maximize motion blur, as opposed to shooting in FILM CAM, where you're trying to maintain a film-like motion blur (typically 180 degree shutter).

HTH
 
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