-Gain

7DDude

7DDude

Well-known member
How do we set negative gain on the DVX200? Where in the menu? Never mind I got it. It's in the (System Mode)-(Extended Sensitivity)-(On)
Sorry guys, I should have searched first.
 
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Isn't the native ISO of the DVX200 500 which would be 0dB? So as soon as you are below ISO 500 you are technically using -dB. Am I right about that?
 
DVX200's base ISO is 500. That is 0db Gain. You increase 1 stop of exposure sensitivity when you double the ISO or increase the gain by 6dB. Therefore: +6dB Gain = 1000 ISO = +1 stop of light sensitivity over base. When you open up the Extended Sensitivity you can now use negative gain. Yes, anything below base is negative. To make it all simple, I created this stupendous chart. You're welcome. :D

-6dB Gain = ISO250
-3db Gain = ISO320
-1dB Gain = ISO400
0dB Gain = ISO500 (Sensor Base)
ISO640
ISO800
6dB Gain = ISO1000
ISO1250
9dB Gain =1600
12dB Gain =2000
ISO2500
ISO3200
ISO4000
ISO5000
ISO6400
ISO8000

I wouldn't want to go past 12dB Gain. But, if I needed it, DVX200 goes up to 64dB.
 
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With out sounding too stupid, of the 3, -db gain settings, which ones do you use the most, and why? Can you give an example of a shot type?
 
7DDude said:
JR, do you shoot -6 most of the time, except maybe low light stuff?
Click to expand...
Yes, basically.

In controlled environments there is no such thing as low light since you light it. Coming from the cinema world I prefer to overlight for a T5.6 in Super 35 terms. You can darken in post, and I prefer that to raising levels and, therefore, the noise floor. Bright outdoors is an easy ISO250 decision. Plus, I love the ~28mm FOV provided by the DVX200...including the f/2.8. I tend to shoot everything this way: wide and open. My decision making is based on if it "feels" right as I don't believe in one solution for everything.

However, in docu work I often will go to ISO2000, leaving the aperture at f/5 for zooms. Depends on the sutuation.
 
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