On Fri, Sep 09, 2005 at 06:07:37PM +0200, Dario Bonazza wrote: > Isn'it it possible that a large rear element force rays perpendicular to > the sensor? This will allow a better image on the sensor and if such an > element is part of the lens design, it won't affect lens performance.
No. To a first approximation light rays from every part of the rear element contribute to every point of the image. The larger the rear element, the wider this cone of rays is, and so the more deviation there is from the perpendicular (and the wider the range of angles, which makes it hard to compensate by angling the sensor pits).
