OP Home > Columns > Tech Tips > Cross With Purpose


Tuesday, June 19, 2012

Cross With Purpose

Reflecting On Reflections • The Triggertrap App • Stacked Converters • Autofocus At F/8

Labels: ColumnTech Tips
Place the polarizing material over the flashes, making sure they're positioned to match each other and are aligned horizontally. Place the polarizer on the lens, and look through the camera into a mirror. While looking through the viewfinder, rotate the lens polarizer until you see the flash polarizers go black. Mark that position on the lens polarizer so the next time the setup will be easier to adjust for maximum cross-polarization without the need for a mirror.

Use a TTL flash exposure and check the results on the camera's LCD. Be aware that you'll be losing from three to five stops of light. The increased clarity and color you'll achieve are well worth the investment and effort involved in cross-polarization.

The Triggertrap App
A new app has surfaced that turns your smartphone into a sophisticated DSLR controller. As I write this, Triggertrap is available only for the iPhone, but my bet is that by the time you read this column, Triggertrap also will work with Android phones.

The Triggertrap app could actually save you money—really!—over the cost of buying your DSLR manufacturers' accessories to accomplish the same functions. In order to use it with your cameras, you'll need the mobile app at $9.99. The app by itself will do many things using your iPhone camera, but we serious photographers want to use it with our DSLRs. To make the connection between the phone and your particular camera, you'll need a dongle and cable, ordered for $19.99 from Triggertrap's website (triggertrap.com).

So what great things will this app accomplish? More than you thought possible. Here's what the Triggertrap is capable of doing with your DSLR attached to your iPhone:

Cable Release. You can use it as a simple release, or place the camera on Bulb and control it for long exposures.

Sound Trigger. Set the phone to a preset sound level; when the phone hears a sound above that, it fires the camera.

Time-Lapse. This is a sophisticated intervalometer. Select the number of images over a set time, or set the camera to go off at intervals of your choosing.

Eased Time-Lapse. Your time-lapse can ease in, then accelerate, then ease out again.


Add Comment


Popular OP Articles