You should use lavs.
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If you don't want to spend the money to do it right (shame on you!) you should use the ATR-6550 for the interviewer and the AT897 for the interviewee, as the interviewee will be giving the long answers. Mount them overhead on booms, or on short stands on a table between them.
Thank you Alcove, I really appreciate the help. It's not a matter of "want" to right now, but have to. I
do not wear $90 jeans, $11-15 dollars at Wal-mart... I do not drink Star-bucks every day (would love to though), it's a pot of store brand atm, whatever's on sale, dark roast. I also don't own a pair of shoes over $50 in value... I did not anticipate needing lav.s as I never thought I'd do a documentary style video. I was interested in getting some a while back when my "hobby" budget wasn't gone, but now is a different story.
I may just have to have the mic.s show in order to get nicer sound, about 16-18"s away (max?) right? I don't have booms, only one boom pole... I do have some small tripods and the mic clamps that will fit. Should I run both mics into the DR-40? Really appreciate all your input, it's been a great help.
If I did get a few dollars to put into the project (episode 2, 3, or later) would it be better to get lav.s for the DR-40 or replace the DR-40 and use the shotguns? This won't be a paying gig so hiring someone seems less.... uh... of an investment? I know the end result would be way better, but for a hack like me, in a controlled environment, might I be able to get a reasonable audio capture??? I am looking for sponsors and donations for the project, so far the location is the first generous gift.