Originally posted by mattt
Any experience or thoughts on what to look for/avoid?
Yeah, any 'proper' shotgun mic with 'dead cat' should do it. I'v used Røde microphone with my cameras, but something like sennheiser with battery(because there is no Phantom with Pentax) like sennheiser 600 should be also very good. Whith these you'll definetly need also proper holder for the mic. Price difference for RØDE 'better shotgun' mic is not that big, but quality might be better. I have rød nb1 and can't use that with Pentax, I'll need external recorder(which I also have, but that will allow me to place that mic somewhere closer up the action, an this is my 'proper set'. I have also røde video mic -not the pro- and it does also need the windshield. bigger the better. especially when it is very windy. Good thing about those 'basic' shotgun video mics with battery, like røde or so, is that they do come with holder which dampens any movement sounds too/most of it.
So unless you want something very specific, these are good options. When you look for more, price will go up quite fast and more likely you need to have someone monitoring the sound etc..