Studio head power output and aperture

JackAllTog (e2 Member)

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6 Feb 2012 - 6:26 PM

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I have recently decided i want to close down the aperture a bit on my lens for studio work.
So need more power in my studio lights.

Question - (assuming everything else stays equal) if i'm shooting f8 but want f11, is it true my lights need to be twice as powerful - e.g. go from 150W to 300W?
or of i want f16 then if i need 600W lights.

I'm assuming single Fstops of 2, 2.8, 4, 5.6, 8, 11, 16, 22 and each one needs twice as much power.

newfocus (e2 Member)

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6 Feb 2012 - 9:56 PM

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Quote: if i'm shooting f8 but want f11, is it true my lights need to be twice as powerful - e.g. go from 150W to 300W?

Sounds right


Quote: or move your lights 50% closer

If the lights are half as far away, they'll light the subject 4x more brightly

Sooty_1

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6 Feb 2012 - 10:07 PM

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If your lights are about 10 feet away, move them to about 7 feet or so.

ade_mcfade (Critique Team)

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7 Feb 2012 - 10:27 AM

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good call - in many studio setups, you get a massive octobox softbox really really close to the model so you get no shadow at all... move the same light source several feet away, it'll be rather different

MeanGreeny

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7 Feb 2012 - 5:19 PM

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Quote: Hmmm, the logic sounds correct, but is it actully true in practice?

Yes.