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Why does it need so much light?
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[Norman Willis] “Is auto-gain like ‘auto-iso’?”
Yes. And you don’t want to use auto-iso.
We have shot with the 5DmII in office environment, using 1 Diva light (4 tubes) and had great results with similar lenses that you mentioned.
Ed
Avid and FCP Preditor
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Anything worth doing at all, is worth doing well.
– Philip Dormer Stanhope, Earl of Chesterfield -
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Hi Ed.
Let me ask this better.
You had one Diva light with four bulbs. How many watts of light is that? And far was your light source from the subject/talent? What ISO? What F-stop?
I am looking to recreate the settings here, and see if my camera gives a similar, or if something is off and I need to recalibrate.
Thanks.
Norman Willis
http://www.nazareneisrael.org -
>>What was the f/stop of the lenses set to?
F/stop was 5.6, to get both the talent (7 feet to lens) and bookcase (12 feet to lens) in focus.
So perhaps a combination of no auto-gain (like on the prosumer cam), plus f/5.6 means I need lots more light with this rig?
Norman Willis
http://www.nazareneisrael.org -
If you knew someone else with a 5D2 or even rent one to do a side by side comparison might point to a defective camera. I’m sure you know this but everything on the 5D2 should be manual settings for video.
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Canon reports that I cannot shut off the auto-gain on the prosumer HF S10’s, so I really cannot compare it to my 5DM2 🙁
I don’t know anyone else in this area who has a DSLR (it’s rural).
Twelve feet from the lens is a black duvetyn (‘commando cloth’) backdrop. Directly in front of that is a bookcase. Five feet in front of that (seven feet from lens) is the talent. 16-35mm F2.8L USM lens set to F5.6, 1/60th, ISO 400: is it reasonable that I need twenty four each 45W fluorescent light bulbs (simulating 150W each) for a total of 1080W of fluorescent light, simulating 3600W of incandescent light (24 x 2800 lumens = 67,200 lumens)?
Is that reasonable? Or do I need to follow up? Thanks.
Norman Willis
http://www.nazareneisrael.org -
From Canon:
“The 82mm measurement that you provided has nothing to do with the light gathering abilities of the lens. It has everything to do with filter diameter, which is to say that it has nothing to do with the amount if light the lens is sensitive to.
The EF 16-35mm lens has a front aperture of f/2.8 versus the lens on the VIXIA HF S10 which has a maximum aperture of about f/1.8 and a lower sensitivity, 0.3 LX in the Night illumination mode. So the HF S10 has better light gathering ability in this area.
Once again, using lights with a higher wattage output will solve this issue. You can also consider increasing the ISO range on the EOS 5D Mark II.”
So what is the maximum ISO I really want to use?
Norman Willis
http://www.nazareneisrael.org -
that is not reasonable.
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Ed,
>>We have shot with the 5DmII in office environment, using 1 Diva light (4 tubes) and had great results with similar lenses that you mentioned.
What shutter speed, F/stop and ISO, maybe? (I won’t hold you to it)
Thanks.
Norman Willis
http://www.nazareneisrael.org -
I called Canon. Basically it is the auto-gain on the small camcorders, plus the fact that I had it choked down to f5.6.
Because the depth of field on the small camcorders is very long, it can shoot at F1.8, and it does not hesitate to boost the ISO. But in order to get both the talent and backdrop in focus I had to choke the 5DM2 down to f5.6, which cut the light by 7/8ths. That plus my earlier choice of ISO 800 and it created the need for a lot of light.
So I will redesign the studio to allow for a shallower depth of field and use ISO 800. Thanks all for your help.
Norman Willis
http://www.nazareneisrael.org
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