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AVCHD for pro applications: AG-AC160, AC130 and other AVCCAM gear.


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Old October 6th, 2012, 08:18 PM   #1
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AC160 shutter control lacking

So, i'm trying out an AC160 and find that the shutter speed control jumps from 60 to 120 to 250 and up.
I try to maximize my shutter for sports shooting and i'm forced to use 12db of gain due to poor field lighting.
With my XHA1 i was able to go to 100 shutter. Am i missing something?
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Old November 21st, 2012, 01:54 AM   #2
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Re: AC160 shutter control lacking

You can set shutter speed and see it hold on this camera
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Old November 21st, 2012, 06:23 AM   #3
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Re: AC160 shutter control lacking

According to the spec sheet, the camera is capable of these speeds for each mode:
[59.94 Hz*1 mode of AG-AC160A and AG-AC130AP]
60i/60p: 1/60*, 1/100, 1/120, 1/250, 1/500, 1/1000, 1/2000 sec.
30p: 1/30, 1/50*, 1/60, 1/120, 1/250, 1/500, 1/1000, 1/2000 sec.
24p: 1/24, 1/50*, 1/60, 1/120, 1/250, 1/500, 1/1000, 1/2000 sec.

I'd expect jerky motion at anything other than 1/60 but according to the specs, you should be able to set it to 1/100 and 1/120.

Another thing that will affect light sensitivity is the shooting mode. 60i is probably the most sensitive and 60p the least (which the A1 does not have). Another difference is perhaps that the A1 is HDV (1440) and the AC160 is full frame HD (1920) which implies smaller pixels on the same size 1/3" chip.
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Old November 21st, 2012, 07:34 AM   #4
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Re: AC160 shutter control lacking

I just don't understand why more control is not available. I hope to shoot in 60p eventually; but am prevented doing so by the difficulty in getting the footage uploaded to the athletic service Hudl.com which chokes on 60p. Time is of the essence to the client.

I've had some success with customizing the scene file but i admit it's a bit of guesswork. I can't find a perfect low light setting.
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Old November 21st, 2012, 09:38 AM   #5
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Re: AC160 shutter control lacking

No surprise that HUDL is not accepting 60p. I would try 30p and try toggling Shutter On/Off to see if that gives you more control over the shutter. Can I ask why you even want a shutter speed higher than 30 or 60? I'd think the motion would be rather juddery.
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Old November 21st, 2012, 11:46 AM   #6
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Re: AC160 shutter control lacking

Quote:
Originally Posted by Les Wilson View Post
try toggling Shutter On/Off to see if that gives you more control over the shutter.
Okay, i'll explore that . . . after i figure out how.
Regarding shutter speed - i don't find averse judder/strobe effects until 250 if that, myself. It's football, i frequently use stills, stop motion, slow-mo, frame enlargement up to 200%; anything in motion is blurred at 60 - not what i'm after for Recruit cuts.

Actually, i shot a daytime game one time at about 1000 and it definitely was strobe-ish - but i liked it; crisp and detailed - almost field level positioning on that game - it was a cool one off, not for every game.

Maybe, i'd shoot soccer and equestrian at 60 but nothing else.
Thanks Les - Hey, do you shoot 60p? How's your workflow?
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Old November 21st, 2012, 12:24 PM   #7
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Re: AC160 shutter control lacking

When I shot football, the world was DV. My workflow is 24 as I do documentary work now and my EX1r and 5DMII are nicely matched that way.

When I am handheld hanging out a vehicle, filming from the back of a truck or panning from an overlook without a tripod, I shoot slo-mo 60 in 24. Playing it back at normal speed takes out a lot of the handheld wobbling. One trip I had a TM700 POV camera and shot AVCHD 60p from a truck but compared to teh EX1r and 5DMII, I found the footage uninspiring.
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