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Why does it need so much light?
I bought a Canon 5DM2 to make better videos in studio. Lenses are the EF 16-35mm II F2.8L USM, and the EF 24-105mm F4L USM.
The 5DM2 wants something like 4 times as much light as my Canon HF S10’s (AVCHD) in order to bring the ISO down to 400 or so. I had thought that it would need less light, since the 16-35 has such a big lens (82mm vs 58mm for the HF S10’s).
I had to quadruple my lighting. I went from shooting with six each 45W fluorescent bulbs with the HF S10’s, to twenty-four each 45W fluorescent bulbs, for the 5DM2. Is that normal? Or is something wrong with my camera?
Thanks.
Norman Willis
http://www.nazareneisrael.org -
21 Replies
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Nothing wrong there. You can use much higher ISO before getting noise. You are sure that you are exposing at 1/48th shutter speed?
Director of the Institute of Media Research (IMF) at Braunschweig University of Arts
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>> You are sure that you are exposing at 1/48th shutter speed?1/60th. I usually shoot 29.97, since I don’t require a film look, and You-Tube/Vimeo is a secondary format.
>>You can use much higher ISO before getting noise.
Hm. Perhaps there is something I don’t understand. I thought the lower the ISO, the higher the quality?
What ISO is ideal for top-quality DVD/BluRay?
Norman Willis
http://www.nazareneisrael.org -
On a 5D2 you can easily go to 800 iso. I shoot with a 7D and yesterday was doing a home interior shoot with a model, using overcast window light and 10 x 45 watt daylight fluorescent lights diffused. I was getting f2 at 1/60th on 100 iso, as it got darker, I went up in stages to 200 iso.
I’m shooting stock footage so I do not want any visible noise. On the 7D multiples of iso 160 seem to have less noise.
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Sounds wrong to me. The 5D should need way less light than smaller sensor on the HFS10.
Cinematographer, Steadicam Operator, Final Cut Pro Post Production.
https://www.steadi-onfilms.com.au/ -
>>Sounds wrong to me. The 5D should need way less light than smaller sensor on the HFS10.
Yeah, me also. I think I need to contact Canon.
Thanks.
Norman Willis
http://www.nazareneisrael.org -
I guess what I’m saying is that I had twelve each 45W light fluorescents blaring at a bookcase maybe twelve feet away, with talent 7 feet from lens, and that was maybe ISO 1000 to get a good picture.
With my HF S10’s I would have had to shut over half of those lightbulbs off, or else I would have been wayyyy overexposed.
Norman Willis
http://www.nazareneisrael.org -
What was the f/stop of the lenses set to?
Also most of those small camcords have auto gain and can go as high as +18dB. So you have to shoot them side by side and compare the quality.
ISO for DVD/BluRay is the wrong thinking. Especially for DVD you do want the video to be as low noise as possible but proper exposure is still the most import, you have to learn the balance of the camera. Meaning properly exposed footage with iso 800 will look better than underexposed footage at 400.
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Norman,
How are you viewing the images? Is this on the camera LCD, external monitor, clips viewed on a computer?
I have found that the LCD may need adjustment on the 5DMII camera.
Ed
Avid and FCP Preditor
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Anything worth doing at all, is worth doing well.
– Philip Dormer Stanhope, Earl of Chesterfield -
>>Also most of those small camcords have auto gain and can go as high as +18dB. So you have to shoot them side by side and compare the quality.
Is auto-gain like ‘auto-iso’?
So I have to make sure the auto-gain (auto ISO?) is shut off, and then compare the light needs of the two?
So maybe I was using four bulbs, but could have used a lot more?
Norman Willis
http://www.nazareneisrael.org -
Good question.
The 5DM2 needs more light on all three (lcd screen, external monitor and clips viewed on the computer).
I think I need to check out what Michael was saying about the possibility that the HF S10 is applying a lot of auto-gain (automatically boosting the ISO).
Norman Willis
http://www.nazareneisrael.org
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