I just bought a 7D + 50mm 1.8 and I immediately started shooting with it but I've encountered a problem. So, I've read that if I want to create the cinematic effect I always have to set the shutter speed the double of the frames I'm using (eg if I use 30 frames I should set shutter speed at 1/60). That's what I did. Since I want to create that beautiful bokeh effect I have the aperture at 1.8 but the thing is, there's just too much light and the image is all white. I'm doing anything wrong or is it like that?
Help me out please!
Your combination ( 7D & 1.8 ) is capable of producing some powerful video results. Just treat that 1.8 very gently -- it's not know for its durability.
The neutral density filter advice is correct. If you want to save money, buy simple ND filters -- from memory I think, think, the one to start out with for daylight shots is the 4 stop filter. I use a variable ND, and it cost much more. It's the difference between thirty bucks and two hundred.
Stopping your nifty-fifty down to 2.8 is also good advice. After you get your ND filter and shoot something outside, the difference in sharpness between 1.8 and 2.8 will be shockingly apparent.
The "cinema" look on your 7D is shutter at 1/50th at 1080/24p. But, don't get too chained down by the "shutter rules." Experiment, be free, be bold. The shutter speed isn't what's creating a "cinematic" look -- it's your frame rate (60p, 30p, 24p) that has the most obvious effect. 24p is the "movie" frame rate, 30p is the TV frame rate, and 60p (at 720) is the HD cable news network look frame rate.
I think someone in this thread asked if the 5D or 7D is being used more for productions. The honest answer is they're both being used -- and everyone who's using them both is waiting for the 5Dm3. Currently, either is a good option relative to HDSLR video. For example, Philip Bloom, the guru-extraordinaire of HDSLR video, his favorite camera is the 5D. However, according to him, almost everything he shot for George Lucas on "Red Tails" was done on a 7D because you can mount a PL lens on a 7D -- but can't on a 5D.
So -- can you use your nifty-fifty and 7D to make a feature film? Absolutely yes. Your issue isn't lack of equipment, it's lack of experience. Learn, learn, learn, practice, practice, practice, test, test, test...... Your only barriers are your skills and imagination.