[LargeFormat] Re: Center filters vs Gray grads vs. Neutral density filters for 4x5

[Guy Glorieux]

On the subject of ND filters, can anyone provide information on center
filters used to reduce vignetting with very-wide angle lenses.  In
particular, how quickly does the density decline from center to edges?
Thanks,
Guy
----- Original Message -----
From: "Jim Brick"

> A graduated ND is used to balance a bright sky with a dark foreground.
> That's why it is graduated. A ND filter is used to reduce the total
amount
> of light reaching the film, usually so you can use a wider f/stop
(reduce
> DOF) or for a longer shutter speed (to make water look silky.) ND
grads and
> ND filters are different and used for completely different purposes.
>
> Jim
>