Sadly I'm not able to post in private conversations yet! I discovered that after typing it all out. I'll just post here; hope that's OK.
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Hello!
It totally depends on your needs. I could write for hours about all the settings and what they mean. If you're not particularly motivated to get a technical head on and 'nerd out' on DSLR settings, use manual movie exposure. That's totally fine if it meets your needs.
If you want to go for a more professional look, consider the following settings:
First set to manual exposure by looking in 'menu' then in one of the video tabs it will say something about manual/auto exposure.
1. ISO - Sensor sensitivity. Affects the amount of light. You don't want that any higher than 200 or you'll see video noise. You change it with the little ISO button on the top of your camera.
2. SHUTTER SPEED - As a rule for video, it should be double your frame rate. So if you're shooting in 1080p 24fps, you want your shutter to be 50 ideally.
3. APERTURE - Depending on your lens you will have varying numbers of f-stop available. As I said before I recommend a 50mm f1.8 Canon lens. It's only like £70 and has that nice 1.8 aperture. Set this on your camera by holding down 'AV' and scrolling the wheel on the top of your camera. By setting a low number, you'll get more light into the shot and a shallow depth of field. A higher number lets in less light but keeps everything in focus.
Play with these until you get a shot that looks nicely exposed. (Not too dark, not too light.) If you find your shot just wont get any brighter by following these tips, you may have to bump up your ISO. In the real world we would go and get more physical light rather than change ISO but it's a way round.
I might have bombarded you with a lot of DSLR jargon there? Not sure how much experience you have but shout if that's all gone over your head.
Best of luck,
James.
PS. What are you plugging your Rode Mic into? Is it Rode's videomic that plugs straight into your camera?