Sunday, January 29, 2012

Snoots and Grids


I spend a lot of time "playing" with new techniques, and just as much time refining old ones. It look upon these as tools that may, when applied judiciously at the right time, provide a photograph with more visual information to help the viewer more nearly "experience" the moment I attempted to capture.

Light Shaping: Light shaping has become something of an obsession with me. Whenever some new light shaping tool comes out, I respond in the same way as a carp approaching a doughball. One sniff, and cah-ching! It's mine.

Light modifiers fall into two categories: broad source and narrow source. Broad sources includes softboxes, umbrellas, and diffusion panels. They all allow the light to spread over a broader area resulting in a softer delineation between light and shadow. At the other end, there are light restrictors such as snoots and grids. Basically, a snoot can be a simple tube attached to the head of the speedlight. When it comes to light containment, a snoot only "suggests" where the photons will land.

Grids: Grids give you the ability to contain you light within a relatively small area. Their honeycomb construction constricts the light into tight cylinders with minimal spill on the edges. One such grid is the Rogue Grid from Expo Imaging. As you can see from the illustration on the manufacturer's web site, it consist of two grid disks that can be used together or separately. If you watch the video, you can see that the beam angle can be controlled to add light to a relatively small region. Unlike the snoot, it "directs" where the photon should go. For a detailed evaluation of the Rogue Grid, click here.

In The Field: I used a Rogue Grid for this shot at the Cantor Art Center on the Stanford University campus in Palo Alto, California.  "The Thinker" had just returned from a two-year loan to the North Carolina Museum of Art, and I was sent to photograph the homecoming.

Making an available light shot was pretty easy, but for this image I used two speedlights: One camera mounted SB-800 was used as a Commander/Fill light, and a hand-held SB-900 with the Rogue Grid would be used as a hand-held accent light. I had both of the Rogue's inserts in place to produce the narrowest beam possible. To make the shot, my D300 was set to manual (1/50 @ F 5.6, ISO 800, Cloudy WB). The lens was an 11-16mm Tokina. I wanted to add a very small amount of fill from the on-camera flash and some additional specular highlights on the Thinker's face from the gridded speed light. Because of the relatively high ISO, the speedlight power settings were set manually to 1/64 (with dome) for the SB-800 and 1/8 power for the gridded SB-900.


Pointing my gridded "spotlight" was a trial-and-error affair. I was standing next to one of the grand pillars surrounding the rotunda, which I used to support my wrist while I made test shots to "walk" the light onto the statue's face. I found that my first shots were poorly directed, blasting light into places I didn't want it to go. This, coupled with the constantly moving ensemble of workers demanded a lot of attention if I was to make a good shot. The submitted photograph, shown below, was number 91 of the 92 shots made during the assignment, which included earlier shots made from different angles.



The grid actually did two things: It kept light on the Thinker's face, and off the face of the worker beside him. Granted, there was some spill on the latter, but not so much as to be distracting. The high/camera left position of the gridded speedlight threw the shadow behind the statue, invisible to the viewer.

The photo ran the next day on the front page. I was pleasantly surprised how nicely the gridded speedlight added detail to the Thinker's face, making the iconic statue easy to recognize.

The Cantor Art Museum is located on the Stanford campus. Admission is free. And if you're over fifty and remember the pink section of the San Francisco Chronicle, as I am and do, you'll forgive my saying,

"Joe Bob says check it out."

To learn more about Joe Bob Briggs, click here.

Sunday, January 22, 2012

Field Expedient Sand Bag


Every now and then a sandbag can be very helpful. Let's say you're using a speed light on a portable portable light stand. You'll find the slightest breeze may cause the whole thing to topple over. What you need is some ballast to keep you light in place.

Obviously, carry a filled sandbag is not a viable option unless you have a strong and willing entourage following you about. I don't know about you, but I tend to find myself alone when I'm in the field, so I'm pretty much on  my own. But I've found an easy way to use my camera bag as ballast by carrying a simple accessory.

I normally carry a flashlight carrying ring snapped on the strap of my camera bag. I found it in a hardware store next to the Maglight flashlights. You may (or may not) know that for many years Maglites have been employed as batons by law enforcement personnel until the PR-24 became the standard issue for most departments. Now I'm been known to carry my monopod in exactly the same manner. But these carrying ring can also be used to turn your camera bag into a handy form of ballast.



Here's a close-up of the the ring hanging on one of the tension knobs of a typical light stand. For the purpose of the photo, the bag is hung much higher on the light stand that prudent, since any weight so high on the stand doesn't provide optimal ballast. The ring is not designed to hold much weight, but if you can allow the camera bag to rest partially on the ground, you'll be fine.

You may ask yourself why I don't just use the shoulder strap. Having the flashlight carrying ring gives me the flexibility to use a variety of attachment points that one might find on the bag such as the D rings or the carrying handle itself (as seen here).

Anyway, it's an inexpensive addition to you "kit" that just might come in handy. However, when I discussed this with a friend, reminded me that an inexpensive carabiner will do exactly the same thing.

For my Chinese readers, Gung Hay Fat Choy!

If you're wondering, those are droplets of rain that you see in the photos.