Support for High Speed Sync (HSS) strobe metering (IM150 only)
The IM150 meter now supports metering high-speed sync (HSS) strobes.* HSS strobes synchronize with your camera, and are especially useful as fill lights when shooting outdoors or capturing fast motion. The app also reports the strobe’s duration. Now you can choose the perfect shutter speed to match your strobes and shooting style.
How it Works
With normal strobes, the exposure is determined by the strobe power, not your camera’s shutter speed. But normal strobes only work with shutter speeds less than approximately 1/150 sec, because of how long it takes the camera shutter to open and close. In bright light or for fast motion you need a shorter shutter speed, but normal strobes timing won’t work. You need HSS strobes, which specially synchronize with your camera’s shutter timing to produce an evenly exposed frame.
With HSS strobes, the exposure is controlled by the shutter speed instead of the strobe. To meter HSS strobes, your meter needs to know the camera shutter speed and measure the strobe duration. The IM150 can now do that.
* The HSS feature is somewhat experimental. Please report any bugs through our support page.