Using ND filters to create DOF?

MatthewC

MatthewC

Well-known member
I was reading about how you can use ND filters to create less DOF.
Now the DVX has the ND filter switches on it, do those create less DOF or do you have to actually have a ND filter mounted to the front?

Also, how does using it create more DOF? What makes it do that?
 
Anything that makes it open the iris up, will decrease the DOF. The ND filter lets you open the iris, without overexposing. It's a modest change, nothing huge like using a 35mm adaptor. Still, combine it with a long zoom, and it'll help.

Good luck!
 
CineAlta said:
Anything that makes it open the iris up, will decrease the DOF. The ND filter lets you open the iris, without overexposing. It's a modest change, nothing huge like using a 35mm adaptor. Still, combine it with a long zoom, and it'll help.

Good luck!
Click to expand...

So I set my camera up to be at 1/64 ND filter on the side, then open my Iris up to compensate it makes for smaller DOF?

If so, that is pretty sweet!
 
It's all about the size of the iris. The more-open the iris, the shallower the DOF.

Using an ND filter cuts the amount of light that reaches the chips, so for equivalent exposure you need to open up the iris. Opening up the iris makes shallower DOF.

The inbuilt NDs and external NDs both function the same way.
 
Barry_Green said:
It's all about the size of the iris. The more-open the iris, the shallower the DOF.

Using an ND filter cuts the amount of light that reaches the chips, so for equivalent exposure you need to open up the iris. Opening up the iris makes shallower DOF.

The inbuilt NDs and external NDs both function the same way.
Click to expand...

Thanks Barry, that's the perfect explanation, and pretty much how I figure'd it was working out. God, I love this camera.
 
of course if you use a long zoom you will facial flatten the features of your subject. Use a modest zoom from maybe 6-8 feet back on a cu to keep deeper demensions. Don't believe me, try it out, too much zoom-in to put your bg out of focus is a killer.
 
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