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Tuesday, November 20, 2007

Lighting 102: 4.1 - Restricting Light

Soft light is... nice.

Soft light is safe. It is flattering. It is, well, expected, for lack of a better word.

And don't get me wrong -- nice, safe, flattering and expected are good things. They put bread on the table every single day for pro shooters around the world. But the people who are doing edgy, risk-taking stuff -- fun stuff -- tend to not be the typical, umbrella-toting photographers.

Hard light -- especially hard light that has been restricted in some way or another -- can really get you out of a rut if you are looking for a way to amp your photos. Remember, using light balancing techniques, you can still control the ratio of the lit-to-unlit sections of a photo. This is true whether you are transitioning from a strobe-lit area to an ambient-lit one, or from an area lit by one strobe to an area lit by another strobe.

So, while apparent light size controls the abruptness of the transition to shadow, your various light balance levels will control how far you fall into the shadow. These two variables, used in tandem, give a wide range of control.

But the beam of the light source itself -- usually a hard light source in this context -- can be controlled via various light restricting devices. More after the jump.
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Gobos

A gobo is basically any type of a light shield. "Gobo" is a slang abbreviation for "go between." It can be either attached to the side of the light, or placed between the light and any place you do not want the light to reach.

This can be to solve a flare problem with a light that is aimed back toward the camera, or to shield light from falling onto the background, or any number of things. Gobos are extremely useful items that do not take up much room in a lighting kit. You should always have a few around.

For example, here is a group shot at one of the London seminars, in which we had just placed a warmed-up separation light in the background, aimed directly the group. As you can see, the light is also spilling onto the ceiling pretty badly.

We can solve that problem by placing a gobo on top of the flash, blocking the light from heading straight up.

The light now does what we want it to do, but not what we don't want it to do.

There is no reason you could not put a gobo on the bottom, too, for instance. In fact, you can have just about any beam pattern you want through the use of gobos, snoots, and/or grid spots. (You can see a full On Assignment write-up on this photo here.)

Any good mechanic will tell you that it is important that your car be able to go, but it is more important that your car be able to stop. This is also how I feel about light. Put the light where you want it, and keep it from going where you don't.

For instance, I could have a hard light that travels as a vertical strip by placing a gobo on each side of the flash.


Snoots

A snoot is essentially a four-sided gobo -- just a tunnel for your flash to restrict the light to a tight beam. The longer the snoot, the tighter the beam. Simple as that. But there are more controls to be had with a snoot.

You'll get fast fall-off on the edge of your beam if the inside of your snoot is black. This is because there is very little light bouncing around the inside of the snoot, contaminating the edges of the beam. You'll get softer edges to the beam if the insides are light grey, or white. And softer yet edges if the inside is silver.

You can see more on snoots and gobos in the original L101 post. I am a cardboard snoot and gobo kinda guy, but you can get ready-made (i.e., non cheapskate-looking) versions if you do not want your clients to catch a cereal box vibe from your gear.

A good example of problem-solving (including the why and the how-to) with a snoot is in this biz portrait On Assignment post.

You can also make snoots out of black foil to have teeny-tiny openings, as in this example. This gives exception light beam control, which is especially helpful with light painting.

Even with close-up photography, the ability to direct strobe light right where you want it can give you the control to light on complete different planes, even if the two planes are literally inches away from each other.


Grid Spots

Grid spots are essentially a patterned group of snoot built into one device. They offer much more beam control over the light. I have grids that will throw about an eight- by six-inch pattern at six feet. That's tight.

The longer the grid is (and the smaller the individual channels) the tighter the beam. The best two ways to make grid spots are out of black straws or coroplast, (a plastic version of corrugated cardboard.)

As an example of the level of light control with a grip spot, I bounced a light around the inside of a missing slice of cake in this photo. The light does not hit the white icing right next door. That's control. That's a grid spot.


Cookies

In addition to simple objects that are designed to block the light, you can shoot through complex objects to partially block the light, or to create a neat pattern of interest in your photos. Typically, these are colled "cookies," if they are 2-D and man-made, which is short for "cookaloris." It's an old movie lighting term.

They are usually a sheet of black cardboard, with a seemingly random pattern of holes. But my preference is to use found objects, such as potted plants, to create patterns as in the photo at left, which is explained in detail here. I cannot tell you how many times this technique has helped to elevate an otherwise boring photo.


Time to Play

So, those are my Four Horsemen of light restricting. But you'll never get feel for using them if you just read about them. So, for this session's exercise, we'll be making some light restrictors and test-driving them.

This is easy, sit-around-and-digest-the-Thanksgiving-turkey stuff. Your exercise is to make some various light restrictors and shoot some consistent photos, swapping out and/or moving the light mods.

For example, you might do something as simple as make a couple of gobo's and a few snoots of dfferent lengths and set a flash on a stand and shoot pic of the wall. By placing the different light mods on your flash, you should gain a good understanding of what it is that they do.

You'll want to be putting together a grid spot, too. It's a tad more complicated to build than the gobo and snoot, but it turns your flash's output into an amazing little beam of light. We are gonna play with that more later.

Tag your exercises as:

Strobist
Lighting102
exercise
restrict

You can view the completed exercises of others, here. There is a discussion thread set up for this post here.

NEXT: Restricting Light / Film Noir Assignment


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15 Comments:

Anonymous Luis Cruz said...

I like the timing on this post - I just posted a little something on DIY grids with examples of very restricted light. I guess I'll be adding some new tags to some of those shots.

November 20, 2007 5:21 AM  
Blogger Rick said...

It's interesting that you "contrast" soft and hard lighting. Perhaps many of us use soft lighting not only because it is safe, but because it is easier. On the other hand, the same many of us are likely fans of the stylized lighting of folks like Helmut Newton or (even more radically) Greg Gorman. Maybe that could be a L102 project?

November 20, 2007 7:17 AM  
Blogger Nandes said...

I bought a box of those black straws a few months ago (1000 for $10 bucks from the restaurant I work at part time).

I've only made a 2" grid and a 1" grid. I'd like to make a full range of lengths but cutting the damn straws is bloody time consuming.

Great results so far though.

example - grid was about 10 feet away on a 285hv

November 20, 2007 8:57 AM  
Anonymous Anonymous said...

@Nandes: being both lazy and impatient (as well as reasonably true to my Scottish heritage - ie tight as a ducks ****) I set about making my grid by using a pair of sharpish scissors.

I made two grids, one 1" and one 2" in a short time. I didn't time myself, but it can't have been longer than about 15-20mins each. Thats including the gluing them together.

They bounce back into shape nicely once they are all packed tightly into the snoot.

And 1000 straws is going to make you a WHOLE LOT of grids!!! I think about 20 straws would do you a 1" grid for a Vivitar285.

Joe

November 20, 2007 12:23 PM  
Anonymous Anonymous said...

I haven't recieved it yet, the auction was last tuesday, BUT the whole kit cost me 61 bucks, With Shipping. My wife has used one that a friend of ours has with ac strobe and loves it and wanted one. I can use the mogul bulbs with my HIMH set up. too good to be true, an octabank 4 bulbs for 61 bucks? I'll keep ya posted. Here is the link for the website:
http://www.amvona.com/index.php?page=shop/flypage&view=1&product_id=2970

November 20, 2007 4:05 PM  
Blogger John said...

Great post, thanks for putting so much useful info on this site!
I've read about most of these things elsewhere on your site, but only in passing, and it's nice to have them all defined in one place - it's easy to forget what all the weird names mean.

November 20, 2007 5:57 PM  
Anonymous 2.1 said...

I just tell light where to go and where not to go, and it obeys my command. No need for cumbersone devices.

I know... full of myself. But if I'm not, then who would be ?

November 20, 2007 7:52 PM  
Anonymous Anonymous said...

Good post.

Lowell's spelling is odd. Cucoloris, or a cookie, is commonly cut from plywood mounted on a metal rod to easily attach it to a gobo head on a C-Stand (Century Stand). But that's a big cookie placed in front of a large light.

You can make them from cardboard, foam core, and other solid materials. In fact, they don't have to be solid. One company places patterns inside nets.

Once you recognize the technique, you'll notice they're used in most every seated interview shot near a wall.

It's just another Gobo, GOes Before Optics. You could customize them to light paint with a flash.

Cheers,
Charlie

November 21, 2007 3:52 AM  
Blogger KJM said...

Silly question: I went out last night with the best intentions to find black straws. I returned with multicolored straws and white straws. There is a shortage of black straws in my neighborhood. Will a grid work with white straws? Will the light obey my command?

November 21, 2007 9:03 AM  
Anonymous Luis Cruz said...

@ kjm: I've been thinking about this too, and the answer, IMO, is already somewhere in the post:

"You'll get fast fall-off on the edge of your beam if the inside of your snoot is black. This is because there is very little light bouncing around the inside of the snoot, contaminating the edges of the beam. You'll get softer edges to the beam if the insides are light grey, or white."

DH was talking about snoots here, but if you think about it, a grid is just a whole bunch of little snoots. You'll probably get a fairly soft circle of light - at least that's what I think.

Please post samples when you've made your white straw grids.

November 21, 2007 8:26 PM  
Blogger KJM said...

Luis Cruz,

I couldn't wait to find blackstraws, so I made my DIY white straw grid. I am pleased with the results, being that this grid allows me to control light in a way I didn't do before. It's a wonderful light controlling tool. I can't wait to try it on my portrait photography :)


http://www.flickr.com/photos/19343024@N07/sets/7215760326475

November 22, 2007 2:09 PM  
Blogger Elephant said...

I haven't actually done this yet, but it seems to me that you would only need one gridspot, as long as you can move it away from the flash head without losing light.

A 1" gridspot positioned 1" from the flash should do pretty much the same as a 2" gridspot. I'm thinking - sliding it up and down a foamcore snoot, with a rubber band to control any light leakage.

Does anyone have any thoughts?

January 17, 2008 9:17 AM  
Blogger Laurent said...

I just found that a Ipod USB Power Adapter BOX is a perfect fit to start a DIY Snoot for Nikon SB-900 !

I took some quick picks - Just to show the box and the difference with / without.

You can see it on my blog http://capteurs.blogspot.com
(text in french)

February 24, 2009 2:58 PM  
Blogger filipe m. said...

The European equivalent to Coroplast appears to be Correx, but I'm still trying to find a place to get some from in Portugal... until then it's black straw grid for me.

May 01, 2010 3:17 PM  
Blogger Meds Davidson said...

The wonderful beloved part to my heart restricting the light with the mods part too, wonderful clear things you do man. Thank you

July 04, 2012 6:45 PM  

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