[LargeFormat] A simple Yellow Filter
Les Newcomer
largeformat@f32.net
Sun Dec 30 11:16:07 2001
Jay Allen wrote:
>
> The Yellow filter --------
>
> So they would use a yellow filter to make the lens sharp like an Apo
> lens.
>
> And, just when you thought it was just to make the clouds show in a
> photograph.
>
> Does any one know why -- the yellow filter makes the older lens extra
> sharp?
>
Sure, some of the old lenses exhibited blue fringing, particularly the
convertables. add a yellow filter to eliminate the blue and you
eliminate the double image or halo and thus a sharper image, add to that
it decreased the blue for the blue sensitive film of the time and it
brought in the clouds to a certain degree.
Les