Flash Photography
The EOS-1D Mark IV features the acclaimed E-TTL II flash metering system. With any of the flashes in the EX Speedlite line, E-TTL II provides reliable flash output whether shooting fill-in flash pictures in sunlight, or using flash in total darkness. The camera's new 63-zone Evaluative Metering Sensor is also used for flash metering with an improved flash metering algorithm which reduces the chances of overexposure with wide-angle shots in which the main subject occupies a small area. If you prefer a broader area for flash metering, Custom Function II-4-1 allows shifting flash metering so that all 63 zones of the sensor are used equally to calculate flash exposures.

The Speedlite 580EX II is perfectly suited to the EOS-1D Mark IV. It has improved reliability of communications through the direct contacts, has a metal flash "foot," and is dust-/water-resistant as with the 1D Mark IV. Other new features include a PC socket on the flash unit, and an external metering sensor for non-TTL autoflash if desired. With the EOS-1D Mark IV, you can set most flash settings using the camera’s menu. It has the same power as the previous Speedlite 580EX (maximum guide number of 190 ft./58m at ISO 100) and, when mounted on the camera, automatically compensates for the camera’s sensor size, enabling high output flash, with more flashes per charge. It includes an AF-assist Beam, which works in conjunction with the EOS-1D Mark IV’s focusing system, and automatically sends color temperature information to the camera when the flash fires, for more accurate white balance rendition with flash photography.

Wireless File Transmitter WFT-E2 IIA*
Canon’s new Wireless File Transmitter WFT-E2 IIA* is designed for the EOS-1D Mark IV. Powered by the camera battery, its compact, weather-resistant design easily integrates with the EOS-1D Mark IV. Packed with wireless technologies such as IEEE 802.11a/b/g, 100BASE-TX Ethernet connections and built-in WPS for secure connections and with multiple file transfer options, it helps professionals keep pace with the ever-changing demands of their jobs. The WFT-E2 IIA also supports USB host capability to attach an additional external hard drive or to add GPS support. Remote Live View also allows photographers to capture images from a remote distance using any browser-enabled device such as a smartphone or notebook computer. A Camera Linking shooting function lets photographers link up to 10 multiple WFT-E2 IIA enabled cameras for simultaneously shooting from various angles (11, including the Master).

* This device has not been authorized as required by the rules of the Federal Communications Commission. This device is not, and may not be offered for sale or lease, or sold or leased, until authorization is obtained.