I am wondering what the best Boom Mic would be for the Sony FS100. I know it has XLR ports on it for input. Any help would be appreciated.
First, there is no such things as a "boom mic." Most mics can be put on a boom pole. Some mics are designed specifically for film/video work.
So, now on to the questions...
What are your applications? (what are you shooting?)
Mostly indoors or outdoors?
Budget?
I'm not a fan of Azden, too many bad experiences.
Since your camera can supply phantom power you can go with a shotgun like the Audio Technica AT875 ($180) or Rode NTG-1 ($250) for outdoor usage and perhaps the sE Electronics SE1A ($150), Rode NT-5 ($220) (not hypercardioids, but better than nothing) or the Oktava MK-012 ($300) (a little sensitive to handling noise, but a true hypercardioid - watch out for Chinese knock-offs!).
If you are going to camera mount (shame on you!!!) the sE Electronics SE4, Audio-Technica AT4021, Rode NT55, or Sennheiser ME62/K6 are possibilities to look into.
You should consider a separate recorder in the near future; get ALL the audio off of the camera.
As I always point out, the skill with which the mic is used is just as, if not more, important than the mic itself. A good boom-op is worth his/her weight in gold!
Seriously?I hate to tell you, but everyone here has led you astray, albeit unintentionally.
Seriously?
Alcove lead him astray when he said, "you can go with a shotgun like
the Audio Technica AT875 ($180) or Rode NTG-1 ($250)". That was
a fine answer. Both mic's are ones he "can go with". How is that
leading anyone astray?
There aren't "a MILLION factors" to this. There is what he can afford
and what he can use. No one answering mentioned "best". You did
sound gruff - overly so. He DID ask a sound engineer and one of the
best answered him with excellent options.
I've never used the ECM-674, nor do I know anyone who has, so I can't really comment.
It's similar to the AT897 and NTG-2 in that it can use a battery to supply its own phantom power.