----- Original Message ----- From: Doug Franklin Subject: Re: Pentax Upgrade Follow-Up & Q
> On Wed, 20 Nov 2002 23:20:25 -0600, William Robb wrote: > > > If you take a picture with a curved field lens, the point of > > focus will be a curve, with the in focus area all the same > > distance from the film. > > Won't the curve be a specific distance from the rear element of the > lens (or the rear nodal point) regardless of the position of the film? > And intersect with the film as a circle or ellipsis (if at all)? Well, yes, the rear nodal point, to be specific, but I was trying to keep it simple, so that I could understand the explanation. William Robb
