UPDATE, JUNE 2024: Strobist was archived in 2021. Here is what I am up to now. -DH


Lighting 102: Assignment - Balance

We have spent the last three weeks studying light balancing and producing photos in fairly restrictive exercises. We have a lot of people doing the work it takes begin to understand the complete and subtle controls you have over the dance that happens in your photos between strobe and ambient.

You have shot into sunsets, flashed against harsh sun and built up your backgrounds with ambient indoor light. These were three very specific techniques, but they all point to a better understanding of ambient/flash control and balance.

Later, we'll be playing with more than one strobe at a time. But for now, this balance stuff should start to be getting intuitive if you are using one strobe.

I want to detail the techniques for balancing flash and ambient as they relate to actual camera operation, and this send you off on an assignment with a little twist -- and a nice, long deadline.

(More after the jump.)

Controlling Your Light from the Camera

Assuming just one flash and ambient light, there are only three combinations with which to control the two variables.

1. To alter flash and ambient levels together:

Remember, flash cares about the aperture and ambient cares about both the aperture and the shutter speed. So to lighten or darken both at once, we adjust the aperture.

If, for instance, our whole scene (flash and ambient) is too dark at f/8, we could move to f/5.6. This would lighten everything by a stop -- flash and ambient alike. Conversely, we could darken the entire scene by going from f/8 to f/11.

2. To alter the ambient level but not the flash:

As we said, flash cares about aperture and ambient cares about both aperture and shutter. So to control the ambient only, we will adjust the shutter but leave the aperture as is. Assuming you are within your sync speed, this will alter only the ambient-lit portions of your photo, as in our coffee table camera shots.

3. To alter the flash-lit area but not the ambient:

This is the most complicated of the three, but only as much as "chocolate/vanilla twist" ice cream is more complicated than either of its components.

Flash cares about aperture, and ambient cares about both aperture and shutter speed. So to alter flash only, we are going to adjust the aperture (which alters both) and compensate for the ambient by adjusting the shutter the other way.

(Sound of 2,000 heads exploding.)

This is not hard at all. Say our ambient is fine, but our flash is not bright enough. Aperture is at f/8 and shutter is at 1/60th, for the sake of argument.

So we open the flash up to f/5.6, which brightens the flash-lit area -- and the ambient, too -- by one stop. Then we close down the shutter to 1/125th, which brings the ambient exposure back to its original exposure value. (1/125 @ f/5.6 = 1/60 @ f/8, right?)

Piece of cake.

To darken only the flash but preserve the ambient exposure component, we would close down the aperture and open the shutter speed by the equal amount.

Three slick moves which add up to total control of your lighting world. All in manual. All from the camera.

And Now for the Twist

Everyone will be doing this assignment in the nude.

No, no -- kidding. But I had you for a minute, huh?

No, the twist in this assignment is akin to the difference between algebra and physics. Stay with me on this one.

Algebra is pure math -- or pure torture if you were not a "math person" when you got to algebra. Math as an end to itself. ThisCrapWon'tEvenHelpMeBalanceMyCheckbook math. Math for math's sake.

Whereas physics is math with a purpose. Physics is math getting something done. We are talking "1/2 AT squared tells me where the water balloon will land" math. And that's cool. And your third assignment will hopefully get something done, too.

Assignment #3: Balance

Two of my friends, Rissa Miller and Nathaniel Corn, are both photographers who also happen to be married to each other. A few weeks ago, Rissa sent me an email about a project that she and Nathaniel had been working on along with two other people who I have not yet met. It's called the Thank You Calendar. It is a calendar designed for (and to raise money for) members of the armed services who are recovering from wounds sustained in a very politicized war.

Politics and opinion are the last things on Rissa's and Nate's mind. In fact, they make it a point for the Thank You Calendar to be politically neutral. Which makes this project all the more special, IMO. They are not doing the calendar for the war, or against the war. They are doing it for the people who are caught up in the war. They are neutral, yet they are trying to do some good. (Boy, that's a 180 from most people with a "for" or "against" stake in this thing...)

One hundred percent of the money raised by the Thank You Calendar will go to wounded service members recovering at Walter Reed Medical Center and to their families. The money will go to help fund visits, and buy personal items that they may need as they recover, etc.

What a neat idea. Isn't it amazing what a few people with the ability to make cool pictures can dream up? And here's the thing: There are easily 10,000 people reading this post who are working at this level, photographically. The trick is to look beyond taking pictures of, say, a camera on a coffee table and figure out how you can make the world a little better place with your camera.

So, here's your assignment with the twist:

Photograph someone in mixed flash and ambient light, using what you have learned in the Balance section to control your variables in the manner that you choose. But more important, produce a photo that makes a difference to someone. How it makes a difference, and for whom, is completely up to you.

Try to look beyond the technique to make a photo that is special in some way. Do not get so hung up on the technique that you fail to make a real picture.

Maybe there is a local organization (like a charitable foundation) whose director could use a nice portrait for an annual report.

Perhaps there is a family you know -- a single parent facing tough economic times -- who would love to have a high-quality family portrait for the holidays.

Maybe there is a centenarian in your town that deserves to have their achievement marked with a photograph.

The specifics do not matter. The magnitude of the result is not what is important. The idea matters. And the idea is, what a waste it is to be learning to do such great work only to have it sit on a Flickr page as an end-all.

If you don't want to do this, it is completely your choice. But in the same way it would be a waste of your ability to do a fine photo of a mannequin as an exercise, it would be a wasted opportunity for me not to at least attempt to harness the wonderful pool of talent and goodwill we have built together in this community in such a way as to do some good.

You want time? You got time. The single photo is not due until November 3rd. That's plenty of time to put some thought into it and pull off something neat. We'll take a little breather on the L102 new material to give you time to concentrate on applying what we have learned to an assignment with a little more depth and potential than he first two had.

Here are your tags:


and for your best shot, include the tag:


You can see all of the take here. You can see the final edits here. Discussion is here -- and please use this as a clearing house for ideas. You are spread all over the world -- people from 176 countries logged on in September. Duplication of good ideas is fine, even encouraged.

It's a really good feeling to make a good picture. It is a much better feeling to make a good picture that makes a good difference. Thanks for your consideration.

And if you have time, please take a moment to check out the Thank You Calendar as an example of what a few photos can potentially accomplish.

NEXT: Balance Assignment: Discussion


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