gardog541 wrote:
was wonders if anybody had experience with a shotgun mic for recording video from a dslr.
Yes.
A "shotgun" mic is a hypercardioid mic with an especially tight pattern of sensitivity. About 80% of what it picks up comes from directly in front, and close to 20% comes from directly BEHIND the mic.
These mics only work WELL when kept within three feet of humans speaking normally. It's best to put them on boom poles above the subject, and point them down at the subject, especially when the ground or flooring is highly absorptive (grass or carpet).
Most pro audio folks will scoff quietly when they see a shotgun used on a camera shoe. Besides picking up noises made by the photographer, on-camera shotgun mics pick up noise behind both the photographer AND the subject. And because sound dissipates with the inverse of the square of the subject distance (1/D^2), the signal to noise ratio is awful at distances greater than three feet. There is only 1% of the sound at ten feet as there is at one foot from the source!
Indoors, pointing the mic down gets the sound source. Ceilings are usually not sound sources, so that's good. Floors are often absorptive, which is good, too.
Outdoors, pointing the mic down gets the sound source, and the ground typically absorbs noise better than carpet. But if aircraft fly overhead, behind the rear of the mic, that's a problem! Keep the back of the mic pointed opposite the plane...
Use a "dead cat" furry windscreen over a shotgun used outdoors. If the mic has a built-in "high pass" filter, turn it on to roll off (reduce) the low frequency wind noises.
I hope that helps... You can spend good money on a shotgun mic, but if you use it improperly, it sounds only a little better than in-camera mics.
Often, when you just want to record an interview, you can use a $30 Omni-directional lapel mic with better results (compared to a camera-mounted shotgun mic).