I'm working on a production next week we're I'll be booming inside a diner but I only have a Rode NTG-3 , Blue Bluebird, MXL 991 SDC. I don't have any hypercardioid microphones, but would it be possible in the future to get an Oktava MK 012 hypercardioid capsule and replace the one in the MXL 991 with it? I'm trying to go for the cheapest solution since I'm a recent college grad and am on a very tight budget. Thanks!
I would honestly worry less about your mic and more about your mic position. Recording for a film, your priority should be clear dialogue and making sure the camera crew allow you near to the actors to get the best recording of their lines. If you get a good clear recording then you can be satisfied that you will have done your job.
I'm going to echo Shaun and say rent a mic. Rent a Schoeps MK-41 capsule if you can - I did a shoot in a giant metal building, and it sounds beautiful with great rejection of all the reflections you'll get in a space like that. I rented mine for $35, and it was a small price to pay for the quality of the microphone.
As an aside, this will always be my advice to folks starting out - do NOT buy anything until you can justify the cost with the income it is CURRENTLY producing. If it's cheaper to rent per job than to eat the cost of purchasing, then rent until it doesn't make sense to do so. Getting cheap gear, or, worse, going into debt to buy expensive, quality gear, is a mistake. You pay way more in interest than you should. Things you should buy - good headphones ($100), a boom pole ($250 or so for a decent aluminum pole), and maybe a mixer, although those are quite expensive depending on what you get. Other than that, quality mics and recorders are very expensive.
I know that was unsolicited, but I don't want to see young folks making financial mistakes that will hamper you in the future.
Good luck on your shoot!
I'll post what I sent you in an e-mail last night, just in case there's anything in there someone else around here can find useful:
I don’t really know anything about the 991.
As for the shotgun situation...yes, hypercardioids usually are preferred for indoor use, but shotguns can work fine as well. Make sure you listen to the mic, preferably through the final record monitor (always listen to what’s going onto tape/disc), and adjust placement as necessary. Try to keep it from getting too close to the ceiling. If the ceiling has those drop tiles, try taking out the ones the rear axis is pointing at. If you don’t pick up more noise travelling through the plenum, just leave them out and that should help cut down on reflections.
I use the Rode NTG-3 all the time (it's my work horse at the moment) and have been well impressed with it's performance. Haven't used the others so I can't comment on those.
My advice recording indoors, regardless of the mic used would be to listen to the space through the mic and eliminate as many unwanted noise sources as possible.
Singe has some sage advice also.