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lighting for large format?

 
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mfrissen



Joined: 10 Jun 2004
Posts: 25
Location: Netherlands

PostPosted: Wed Oct 27, 2004 11:55 am    Post subject: Reply with quote

Hi,

I want to start using my CG for studio work as well. I shoot mainly portraits, fashion, glamour and nudes. I have a couple of 300Ws Strobes. Since I used my digital SLR, this was plenty of light.
I guess with the CG I'd be shooting at f/11 most of the time.. Do I need stronger lights?
I'm a techno nitwit..

Marco

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David A. Goldfarb



Joined: 03 Sep 2004
Posts: 142
Location: New York City

PostPosted: Wed Oct 27, 2004 12:19 pm    Post subject: Reply with quote

You've got enough to get started and find out whether f:11 gives you enough DOF for the kinds of effects you want. If you've got room, you can always move the lights closer to the model for more light.

In the long run, more power will give you more flexibility to use softboxes, umbrellas, bounce cards, diffusers, gels, additional accent lights, smaller f-stops, etc., but best to use what you have and discover what you really need in practice before spending money on lights.
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Dan Fromm



Joined: 14 May 2001
Posts: 1884
Location: New Jersey

PostPosted: Wed Oct 27, 2004 1:37 pm    Post subject: Reply with quote

Quote:

On 2004-10-27 04:55, mfrissen wrote:
Hi,

I want to start using my CG for studio work as well. I shoot mainly portraits, fashion, glamour and nudes. I have a couple of 300Ws Strobes. Since I used my digital SLR, this was plenty of light.
I guess with the CG I'd be shooting at f/11 most of the time.. Do I need stronger lights?
I'm a techno nitwit..

Marco

I don't speak WS. WS is a measure of power entering the flash head, not of light emerging from it. What is your flashes' ISO 100 Guide Number?
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mfrissen



Joined: 10 Jun 2004
Posts: 25
Location: Netherlands

PostPosted: Wed Oct 27, 2004 1:58 pm    Post subject: Reply with quote

ah yeah.. the GN is 180ft(55m) at 100ISO if I'm not mistaken.

ah, and I think I can then calculate my own f/stop from it.. GN/distance=F, right?

[ This Message was edited by: mfrissen on 2004-10-27 07:01 ]
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Dan Fromm



Joined: 14 May 2001
Posts: 1884
Location: New Jersey

PostPosted: Wed Oct 27, 2004 3:00 pm    Post subject: Reply with quote

Quote:

On 2004-10-27 06:58, mfrissen wrote:
ah yeah.. the GN is 180ft(55m) at 100ISO if I'm not mistaken.

ah, and I think I can then calculate my own f/stop from it.. GN/distance=F, right?

[ This Message was edited by: mfrissen on 2004-10-27 07:01 ]
Exactly. Lotsa power. Two of 'em have a combined GN of 255.

One evil thought. My beloved Vivitar 283s have rated full power GN = 120, but my flash meter and film both find GN = 80 for the weakling and 90 for the strong one. So you probably should check how much light your flashes actually put out. In any case, lots.

Cheers,

Dan
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danimal



Joined: 22 Jun 2001
Posts: 48
Location: Upper Sonoran Desert

PostPosted: Thu Oct 28, 2004 4:07 pm    Post subject: Reply with quote

Hi,
with two 300WS strobes you're in business. You'll probably end up using fairly slow shutter speeds, so your models will have to hold still and you might want to keep the wind machine turned off.
    What's your flashmeter say about f-stop/shutter speed combinations? If you don't have a flashmeter, you should consider buying or renting one.
Dan


[ This Message was edited by: danimal on 2004-10-28 09:10 ]
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