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In the advice on using different cameras for another angle.
I've found using different cameras resulted in different video quality in lighting, white balance, and sharpness to be seriously impacting between cuts during editing reultin in some creative techniques to try to hide the differences in video footage.
Even with using same cameras, differences in camera position where lighting was totally different such as a shot fom behind a speaker perspective were also challenging.
An excellent suggestion to use stand alone device for picking up audio is also key. I've found that nice crispy quality audio is 80 percent the juice in the editing of visually bland stuff like documentary or public speaking events.
Don't just give away the audio recording task to just one device either. I use a Marantz PMD661 with XLR input ability attached to a Rode NTG-3 mic at the podium. You could then attach a wireless transmitter to the subject (or podium) and transmit that back to your camera position at the back of the room/hall plugging into at least one of your channels letting the other channel pic up stuff at omert� location or from some other attached mic. Also place a audio recorder somewhere in the facility to record ambient audio which could also act as a master audio.
Get there early and record several minutes of the location with no action or "quiet room" recording. This could serve as the audio track base between two distinct clips where audio is very distinctively different even when not speaking because ambient sound change because of audience noise.
Only well organized locations and cooperative staff result in being able to acquire audio fom in house pa systems unless well planned in advance.
Get stand alone interviews of key note speakers either before or after the event. Ask them there full name title spelling and a contact email tel no in case you need it, on camera - written down stuff gets lost.
The one on ones That change the dynamic of the recording of the event from more than just what took place before the audience. In fact you could get a better condensed version of the event using interviews and then use the video of the event as secondary cut material. This is your challenge back in edit.
Also get audience interviews to. Take a few good quality photos during the event.
Check your date time on all recording devces video/stll/audio so you can archive the raw material properly.
Try to use some kind of video slate or just a piece of paper or a flyer of the event with names, date, and location info. Shoot it along with other information like street signs, building addresses, buiness cards so the reference material follows the material to the computer instead of getting lost in your bag.
Emphasis is on audio quality. Use a wind screen - don't just settle for the foam. Get mini dead cat versions that can be slid over standard mic size. May need a couple for podium as well as lapel, and ambient recorders.
Use a small digital camera in back of room placed high "the cathedral looking down from a rear balcony shot" as a master coverage backup for awkward cuts during broad based action such as when speakers enter the room, or audience assembly, and when the event comes to an end and every body starts to leave. Just let it roll the entire event.
Get a friend to roam around with another camera "or you do it" after locking cam 1 on the podium shot to get remote in action shots of audience faces and questioners.
Be ready for any awards or other on stage presentations. Take charge and have them stand, look, or arranged properly. They know your in charge and want to get a good shot. They can blame it on you for "hamming it up" during a group photo vs them looking like a self promoter for wanting to organize a group.
On and on and on. Can't over per-produce your event. Previsualize the event and anticipate the activity, action to mentally story board the action so you can be there before it happens.
Like at a birthday party - at some point you know the cake is going to be brought out with the candles lit (maybe you can get back into the kitchen while they are lighting it, and cover the bringing of the cake into the party area shot from behind), the birthday song is sang, the candles are blown out, a speech is given (adult) or applause and laughter. etc. - Where will you be at that moment? (way in the back? Or at a key strategic position because you did you mental homework?)