Appropriate shutter speed
 

I have been watching the Doug Jensen video's on Mastering the EX1. He suggested that the best shutter speed for HD 1080 50i and 25p is 1/50 second. That setting does not exist on my selection list (firmware 1.11). Which would you consider then the most suitable 1/60 or 1/100 sec. and the reason?
Thanking you in advance.

Harro.

I too watched the DVD and switched to 1/50 th on his recommendation. I have a 1.1 version and the 1/50 is definately there in the menu. Are you sure you've selected 1080 and 50?

I'm thinking that maybe the 'NTSC' version has its default at 1/60th, whereas we people in PAL land have 1/50th.

Depending if you are shooting using tungsten lighting, if you are in a 50 or 60 amps area then match the shutter speed to your area amps, a mismatch may or will result in a rolling lines effect.

Selecting either Pal or NTSC, to sort the problem out.

I am in PAL land, and my settings are definitely for PAL. The shutter speeds that I have shown under the SPEED setting are: 1/60, 1/100, 1/120, 1/125, 1/250, 1/500, 1/1000, 1/2000.

My camera is set to PAL country, HD and 1080 50i. Love to know where the lower settings have gone. As mentioned the firmware on the camera is v1.11.

To get 1/50th, switch shutter off (it will be 1/25th in 25p, and 1/50th in 50i mode).

So the camera's more light sensitive in interlaced, then.

Harro - if you film at 1/100th sec you can open the iris a stop but the footage will be very slightly choppier. You may not notice the effect till you shoot at 1/250th sec or so, but it's there, and pans and zooms will show it up.

tom.

With shutter off, the camera is equally sensitive in interlaced and progressive.

Of course with NTSC Area settings, switching shutter off gives:

- 1/24th for 24p
- 1/30th for 30p
- 1/60th for 60i.

Interlaced seems to be more sensitive, but since the exposure is half of progressive when shutter is off, one does not gain anything when switching either way.

Perhaps I should have added that everything else equal, the EX camera is more sensitive in interlaced than in progressive mode (due to line doubling).

However, with shutter off, the two modes equally sensitive.

So to clear things up in my mind, filming in 1920x1080 50i, to get a shutter speed of 1/50 I need to turn the shutter switch off. If I use were to use a shutter angle of 180 degrees, will this be exactly the same as a setting of 1/50 sec (if it was available to be set), or having the shutter switch turned off? or is a shutter angle of 180 degrees equivalent to 1/100 sec when in 50i mode, if so does a setting of 1/100 sec actually apply to each field or is it the total time for a frame?

Thanking you all for clearing up some of these things for me.

Harro.

In interlaced PAL video, 1/50th sec is a shutter angle of 358 degrees, where effectively everything that happens in front of the camera is recorded. 180 degrees is indeed 1/100th sec, where only half of everything is recorded - which makes subject or camera movement slightly jerky.

Thank you for clearing things up for me.

Harro.