Does 7D really have custom shutter speeds ?

[Kholi]

Originally Posted by zcream

I had my CF1 : Exposure setting to 1/2 stop increments. So it moves 30, 45, 60 etc.

I changed it to 1/3 stop increments and now I get 30, 40, 50 etc.

That 1/45 I must try. Might come in handy one day, for whatever reason. Thanks.

[bwwd]

Originally Posted by zephyrize

Shutter speeds increase or decrease by FRACTIONS, values such as 1/7 or 1/22 do not exist in any camera.
it's like f-numbers, there are f2, f2.8, f3.2, but no such thing as f2.1 or f3.0 ...

I have a lens where aperture goes smoothly without stoping from f2 to f 8
And in between im sure i woould hit f3.2-3.3-3.4 or f4.3-4.4-4.5 ,why i wouldnt if ring works smooth like focus ?
I actually have it in my hands right now and its a long way between f2 and f2.8 ,i can stop anywhere inbetween,on like f2.6 or f2.2.

[Jester2138]

Originally Posted by Martti Ekstrand

Wrong. It was filmed at 1/2 second shutter speed.

Erm... I'll say it again... It's physically impossibly to expose a frame for longer than 1/24 if your at 24p (it's like saying your playing half-notes on an instrument that's only capable of eighth notes...). If your camera says "1/2" then it's not actually shooting 24p...

[Jester2138]

Originally Posted by bwwd

I have a lens where aperture goes smoothly without stoping from f2 to f 8
And in between im sure i woould hit f3.2-3.3-3.4 or f4.3-4.4-4.5 ,why i wouldnt if ring works smooth like focus ?
I actually have it in my hands right now and its a long way between f2 and f2.8 ,i can stop anywhere inbetween,on like f2.6 or f2.2.

You could use shutter speeds like 1/27 1/28 etc., it's just the standards that have developed use fractions and ratios and such so that there are similar increments between f stops and shutter speeds, so cameras only support those standard increments.

[bwwd]

and its retarded IMO,we should be able to set any shutter speed between 30 and 4k

[mhood]

Originally Posted by Jester2138

Erm... I'll say it again... It's physically impossibly to expose a frame for longer than 1/24 if your at 24p (it's like saying your playing half-notes on an instrument that's only capable of eighth notes...). If your camera says "1/2" then it's not actually shooting 24p...

Go here and watch his incredible short if you haven't. Nobody said anything about 1/2 shooting at 24p.

http://www.dvxuser.com/V6/showthread.php?t=177342

[NoxNoctus]

The math, it is escaping you. Think about it.

[dvxusr]

Is it just me or can we change shutter speeds while filming? Just tried from 30 to 4000 at f1.4

[Blackout]

Originally Posted by Jester2138

Erm... I'll say it again... It's physically impossibly to expose a frame for longer than 1/24 if your at 24p (it's like saying your playing half-notes on an instrument that's only capable of eighth notes...). If your camera says "1/2" then it's not actually shooting 24p...

This is not true. The frame rate of 24p is the rate of the capture of the image, not the shutter, so you have 24p (all films) capturing at 24 frames per second all sorts of different shutter speeds, from very fast to much much slower than the 24p rate. You could have a shutter wide open getting big blurs, written to 24 frames per second.

For instance, the normal motion characteristics of films that everyone is used to seeing during normal scenes is double the rate of the capture, so a 24p film usually has a shutter of 1/48. This is what I don't get about the 7D.. it doesn't offer a 48 shutter does it? Weird.

[Jester2138]

Originally Posted by Blackout

This is not true. The frame rate of 24p is the rate of the capture of the image, not the shutter, so you have 24p (all films) capturing at 24 frames per second all sorts of different shutter speeds, from very fast to much much slower than the 24p rate. You could have a shutter wide open getting big blurs, written to 24 frames per second.

I think we must be having a mis-communication issue. On a film camera, I'd love to hear how it's possible to open a mechanical shutter for half a second 24 separate times... but only take a total of 1 second for all 24 half-second frames... It should take 12 seconds, not just 1.

"The frame rate of 24p is the rate of the capture of the image, not the shutter" But... OK, look at it this way. Take a "normal" video camera on which you can set a shutter speed lower than 1/24. There is no mechanical shutter like on a film camera. If the cam pulls an image off the sensor 24 times a second, no ONE of those images can last longer than 1/24th of a second. Thus, effectively, you have a shutter speed FASTER than or EQUAL TO 1/24.

On the cameras I've seen that do a low shutter speed like this, if you set, say, 1/4, it will be jerkier and blurrier, likes it's recording at 4 fps instead of 24.