first I want to say this is a great video for those who are looking to understand the info. its also interesting and a fun presentation. saw this posted on a filmmakers website I am involved on.

Just a minor addition - Gain is a means to increase or decrease the video signal. (Some cameras can + or – gain) It is only an amplification tool not an increase in the actual sensor sensitivity.
Now trying to give the short lesson for video: Video sensitivity varies because of the engineering of the chips. Chips are not film stock, so they are slightly different in each camera. Roughly – Video sensitivity is around 320 ISO/ASA; and this can change based on your camera, chip size, (and if you own the RED) internal ISO/ASA/EI selection. This is what I have been told; how ever you want to rate it is up to you (I have seen it rated at 250, 320 and 400). It depends on how you treat it; broadcast video or narrative film. Gain is an internal boosting like when developing the stock you could push (+db gain) or pull (-db gain) a film stock.

I’m going to cut myself off because the topic on how this info is what it is becomes long winded and eventually pointless. I don't want to appear to be some online jerk. SO i apologize if this came off that way.

I only wanted to add some additional information to perhaps help, in what i saw, as a slight unclear lesson of Gain.

So again, great informative video.

Hey Edward. Thanks for taking the time to write that out. And I'm glad that you liked the video too. I'm a little embarrassed to have not researched gain better before deciding to present it here, but I'm happy you decided to say something. It's an interesting technical detail worth including in a future video.

Thanks again.