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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 06 Apr 2005 (Wednesday) 09:05
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Fill light at sunset

 
PhotosGuy
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Post edited over 3 years ago by PhotosGuy.
     
Apr 06, 2005 09:05 |  #1

These are copies of 35mm slides. (Made with the slide duplicator here) https://photography-on-the.net/forum/showthre​ad.php?t=58609
We needed a shot that illustrated many products that could be made from the bypoducts of coal-gassification. Seemed a pretty dry subject so we decided to take it outside. This shot used a 750 watt quartz fill light, but similar results could be had using a flash with a warming filter. The trick is to get the light far enough away so the light fall-off is minimized.

"Standard" f-stops: f/1, f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22, f/32, f/45, f/64, f/90, f/128, etc.

EDIT: "light fall-off is minimized" What I mean is, if the light is 2.8' away, the intensity changes 1 stop between 2'-2.8' & 1 stop between 2.8' to 4'. Not much "depth-of-light"?
But at 35', the intensity changes 1 stop between 32'-45' & 1 stop between 22' to 32'. Much better, no?

This should clarify that concept...
Here's something that will help you figure light fall-off in your head:
The difference between a light at 2.8 feet & the same light at 4 feet is 1 stop.
Same for 8 feet to 11 feet.
Same for 16 feet to 22 feet.

Do you see where the difference between those numbers come from? They come from the The Rule of Inverse Squares & also correspond with f-stop numbers.
4 to 5.6 to 8 to 11 to 16 to 22 to 32 to 45; there's one stop difference in fall-off between them.

So, if you're 6' from the subject using a fixed output flash & you want to use f/4 but the fixed flash output requires a setting of f/5.6, then just back up to 8' & zoom in a bit. (Or you could just ND gell the flash.)

If you're shooting something at a great distance, like sports, you could choose a setting for 45' & everything within 32' & 60' would be within one stop, which can easily (usually) be fixed in RAW processing. I've done that with football & hockey & it works well.

My favorite location flash, & there are a lot of links in here:
Simple "every-day-emergency" location lighting

Curtis has a great thread on FLASH PHOTOGRAPHY 101 – A BEGINNER’S GUIDE that includes an example. Check it out.

The background math, for the Measurebaters among us: Digital Photography One on One: Episode 59: Inverse Square Law (external link)

More manual & auto flash info here: Settings?? Help Needed!
Low cost off camera flash tutorial for beginners

Easy tip to find your starting exposure: Guide Number: Your Free Flash Meter (external link)

How to Shoot Flash Into a Sunset (external link) - Strobist

(Below)
The first shot is sort of what we had in mind (but we shot it later). Then I saw the sailboat coming & there was a mad scramble to set up for it. (The assistant had her feet in the water while she held the sail.) ;) Another happy accident happened, too. A skin diver came out of the water & we borrowed him for another variation.

So the moral of the story is, when you've "got the shot", don't stop. Look around & keep shooting. Chances are that you'll have some happy accidents, too!:D


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FrankC - 20D, RAW, Manual everything...
Classic Carz, Racing, Air Show, Flowers.
Find the light... A few Car Lighting Tips, and MOVE YOUR FEET!
Have you thought about making your own book? // Need an exposure crutch?
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PhotosGuy
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Apr 06, 2005 09:10 |  #2

Afterthought: Here's the shot with the skindiver & another example using flash fill, illustrating "Coal, energy from the sun".


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FrankC - 20D, RAW, Manual everything...
Classic Carz, Racing, Air Show, Flowers.
Find the light... A few Car Lighting Tips, and MOVE YOUR FEET!
Have you thought about making your own book? // Need an exposure crutch?
New Image Size Limits: Image must not exceed 1600 pixels on any side.

  
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2goldens
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Apr 06, 2005 19:57 |  #3

I am going to make a copy of that information. Thanks.


Remember to "See what the camera sees".

Anthony
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jcw122
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Sep 10, 2006 17:01 |  #4

Great explanation, thanks!


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jsvphoto
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Dec 27, 2010 22:35 |  #5

Helpful info - thanks for sharing!


Canon 7D Gripped; Canon 7D ii Gripped; Canon 17-55 f/2.8 IS USM; Canon 70-200 f/2.8 L; Canon TS-E 24 f/3.5 L; Sigma 85 f/1.4; Rokinon 8mm f/3.5; various lights & gizmos
Website: www.jsvphotography.com (external link)

  
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happyattacks
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Apr 23, 2011 16:09 |  #6

Great info. I had to read this twice or three times though. I'm afraid I'm still so new to all this. =/
Thanks for sharing!




  
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Fill light at sunset
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