Recommend On-Camera Light for use in the sun at

Go Back   DV Info Net > The Tools of DV and HD Production > Photon Management

Photon Management
Shine an ever-loving light on you.

Thread Tools Search this Thread
Old January 1st, 2008, 02:52 PM   #1
Major Player
Join Date: Sep 2002
Location: US & THEM
Posts: 827
Recommend On-Camera Light for use in the sun

This requires a little explanation, here goes:

I want to use a daylight balanced on-camera light (12volt is OK) to fill-in back lit subjects. A worst case scenario of a typical sunny day would follow the F16 rule on my FX1E (ISO approx. 125) if I shoot shutter 1/125s.

To keep the energy requirement down I propose to clamp at F2.8 and let the shutter rise by 5 stops to 1/4000s. The effect on motion doesnt concern me because I can add the correct motion blur in post to give true 1/50s motion blur.

So my question is, assuming a distance of say 10 feet to subject at F2.8, what power in LUX or watts do I need to correctly expose the subject against a correctly exposed background?
John Jay

Beware ***PLUGGER-BYTES***
John Jay is offline   Reply With Quote
Old January 1st, 2008, 03:32 PM   #2
Join Date: Jan 2006
Location: New York, NY
Posts: 1,267
I don't think there are any on camera lights which will give you enough light at 10 Feet in daylight to balance the subject to the background.
As for your increasing the shutter to open the iris more that will not change how much light you need to fill in as the shorter shutter speed balances out the effect of the wider F Stop.
Try looking at reflectors and think about getting Large off camera HMI lights if you really want to make a serious dent in the contrast range when it is Sunny.
Daniel Epstein is offline   Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

(800) 223-2500
New York, NY

B&H Photo Video
(866) 521-7381
New York, NY

Texas Media Systems
(512) 440-1400
Austin, TX

Precision Camera
(800) 677-1023
Austin, TX

(800) 323-2325
Mineola, NY

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > Photon Management

Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -6. The time now is 04:08 PM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2018 The Digital Video Information Network