Rob Studdert wrote:
On 4 Nov 2005 at 14:25, keith_w wrote:
Alla my 35s have a solid rectangular opening in the camera body, thru
which the light rays pass.
It's THAT that forms the outline of the exposed image on the film.
That being the case, how can a different lens, with a changed light
bundle size mean anything at all? It's all chopped off by the body
opening...
Iguess it's conceivable some other cameras don't follow that design
convention, so... just a comment. And a question.
I don't know of any film body where film gate sits flush on the film, the film
generally sits on rails so there is a slight gap between it and the mirror/lens
box. If a lenses rear elements are far from the film plane it follows that the
rays will pass from the lens and onto the film at a smaller angle than that of
a lens which (particularly in the case of a RF camera) may protrude into the
body cavity.
So in short a lens will project a frame on the film relative to the angle of
the rays exiting it due to the fact that the aperture that masks the film is
slightly forward of the plane of focus.
Cheers,
Rob Studdert
Yes, I can picture that [snicker...]
But, any differences must be miniscule where they exist. I mean *SMALL*!
keith
