Using a separate shutter cable with Promote Control offers the following benefits:

• Enables Mirror Lock-Up functionality
• Allows automated exposures longer than 30 seconds
• Ensures faster camera reaction to shutter release, especially in "High Dynamic Range" mode
• Activates "Manual Hold" mode
• Enables arbitrary shutter speeds in "One Shot" and "Time Lapse" modes
• Allows pre-focusing the camera using the Promote Control "Focus" button
• Enables basic Promote Control shutter release functionality even when out of battery power

This shutter cable is compatible with the following cameras:

Canon 400D, 450D, 500D, 1000D.

NOTE: Canon 550D camera is not supported with shutter cable due to the hardware limitations of the camera. The 550D cannot release its shutter via shutter cable while also connected via USB cable. USB-only operation with Promote Control is fully supported.