The IQ4 back has the same basic design as the IQ3—a modular brick which attaches to the back of an XF (or other) camera. It retains the same basic interface—four physical buttons and touch input support—but swaps the aging Compact Flash memory format for dual XQD and UHS-II SDXC slots, and now uses USB-C or Ethernet for tethered shooting. One quirk of note—you will absolutely need to use an XQD for non-tethered shooting, as the SD slot is only used as a real-time backup. Phase One includes a pair of 64GB cards, one XQD and one SDXC, with the kit.
Tethering over Wi-Fi is also an option, so you don't have to plug a cable into your computer to get it going. I tested it with a MacBook Pro and Capture One Pro 12 and my 802.11ac home network (peer-to-peer connections are not an option). I was able to connect to my 5GHz network by selecting it from the camera's screen and typing in the password. The on-screen keyboard is a little tight and I had to use the backspace button a few times, but once it was set up, the wireless tethering worked.
Speed is a big concern for tethered operation, and it's an issue when working wirelessly. There's about a 15-second delay between making an exposure and its appearing in Capture One. With a wired connection, there's no delay. But you do get the option of showing a live feed from the sensor on your computer screen with no lag of note, just as you would with a wired tether. The IQ4 doesn't work with the iPad control app at press time—its support is limited to the IQ3 generation.
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