Best lens for video (interviews) with GH3

20 1.7 would be good. 25 1.8 would probably be better as it would have the silent af. If you have more space then the 45 can't really be beat either, lot's of options  

 

That depends entirely how you like to frame your interview shots. Are they medium shots? Medium close-ups? Full close-ups? Long shots? A combination? I've seen all kinds of angles and framing used in documentary work, so some specificity would help.

Generally, I'd point you toward the 25 for a mix of medium shots and medium close-ups (or if you need a closer working distance), and the 45 for medium and full close-ups (or if you prefer placing the camera further away), but you could use almost anything if it serves the ideas you want to convey.

It's an artistic choice. I'd prefer to keep my camera further from the subject to draw the most honest, natural interview out of them as I can. Roger Deakins (Skyfall, No Country for Old Men) prefers to put his camera closer to the subject with a wider lens to give a more realistic sense of proximity--a closer feeling to his close-ups. Both are equally valid, but it's down to the artist to decide how to interpret a scene. Give it some thought.  

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Double post.

 

I would say that zoom would be the best bet. You can always add a prime later if you need a larger aperture or find you always shoot at a specific focal length.

Is your $200 budget for the lights or the lens? That price would be doable for lights if you improvise or use cheap made-in- China gear. It appears that they used a 2 light set-up of key and fill. $200 for a lens is fairly limiting - kit lens or a very low priced used lens would be your options.

You are also going to need a good tripod and don't forget mics!

To do a video like that one would require two cameras. One is set fairly tight and the other is a bit wider. Are you actually wanting to do the reverse angle or just a single?

I would recommend shooting in manual focus or at least S-AF and set the focus at the front of the clip. The thing I hate the most about a lot of internet videos is the hunting focus.

 

I would suggest you start with a single angle and then once you get the hang of it and have a budget, then you can add a second if needed. It can be done with just one camera if you are willing to do multiple takes and edit them however. I just finished doing a video of three ladies promoting a ladies event{I work for a church}. I shot all three together and recorded the whole thing through. Then I shoot each lady doing her part of the same speech in close-up. It works very good for scripted interviews but not as well for a "man-on-the-street" style.

I would avoid mixing lower quality video with higher. It can be done but may give problems and will be lots of work in edit to make it look right{unless as you suggest you make it obviously different}. Adding "insert" stills or b-roll footage is a great way to cut the monotony of a long interview.

That light kit would be a good start. Softboxes do make things so much better for interview type shooting. Why do you need 2 audio recorders? If you need dual inputs get a recorder with dual inputs! It is a lot easier to mix it when recording, than in post. I use a Tascam DR100 and Sennheiser mics but this is a little beyond your budget. However the Tascam DR40 has dual inputs - combo 1/4" and XLR inputs to be exact. XLR mics are better than 1/4" jacked mics as they have much better sound{balanced verses non-balanced - http://en.wikipedia.org/wiki/Balanced_audio }. What mics were you looking at?

 

I highly recommend the Oly 17mm f1.8. It is a nice versatile focal length - 35mm full frame equivalent. The auto focus is excellent. It is fast, quiet, and very sharp. As a 1.8 is is great for those dimmer locations. I got mine for $400 here in Canada.

 

On the recorder - do what you like but I still think a single one would work better. My Tascam DR100 can easily be carried on a belt{if you add a clip or pouch}.

XLR inputs have WAY better audio than a jack of any size. The reason is that they are balanced. I run sound as part of my job at a church so trust me I know for a FACT that it does especially if you run a cable longer than a few feet.

The Shure would work for you if you get an XLR to jack converter{which often add noise BTW} or you use an XLR recorder.

Lastly on the LED light - no! Either you buy Chinese made and save some bucks or you buy made some place else and pay through the nose.

 

I'm surprised nobody has recommended the 14-42 PZ if you are looking for a budget solution.

Edit: Just saw manual focus is a must... that lens is hard to focus manually. Maybe not a good option.