Setting f-stop dvx / film iso

T

TheJackyl

Active member
Since film needs more light to expose than video does (the DVX) is there a way to set the fstop or would you want to use ND filters, in order to make the dvx as sensitive as film stocks, to compare how much light film needs to how much video can shoot with, only in ballpark figures nothing exact

instance if you use iso 100 film, you need much more light than iso 800, is there a way to see on the dvx a ball park on how much light iso 100 film would need to expose?

thanks
 
Well... consider that the DVX is 640 ISO.

Each f-stop cuts the amount of light in half.

Each doubling of the ISO results in needing half as much light (so ISO 200 needs half as much light as ISO 100 for the same exposure).

So if you took a reading of the DVX and got, say, f8.0, then you'd know that 320 ISO film would need f/5.6, 160 ISO film would need f/4.0, and 80 ISO film would need f/2.8.

Approximately. It's not exact because the DVX's exposure curve isn't strictly linear (either that, or the f-stops at the open end of the lens are very optimistic and don't match the actual t-stops at all). But if you stick between 2.8 and 11, it should be basically linear and reasonably accurate in comparison to film speeds.
 
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