With the increased popularity of small form-factor interchangeable-lens cameras comes the need for better audio. The internal mic’s on mirrorless cameras and DSLR’s are typically only good enough for audio sync. That said, most using those cameras don’t have the capacity for a recordist or a boom operator.
The Azden SMX-30 is a video microphone with both mono and stereo capabilities, offering two separate capsules for switchable function. Have some dialogue to capture? Put it in mono mode and you will have a camera-mounted, super-cardioid shotgun mic. Need to capture the atmosphere for your scene to come alive? Switch it to stereo mode and you’ll record a stereo image with 120 degrees of coverage via two cardioid mics working in tandem.