If light *has* to strike the sensor at an oblique angle, it would logically follow that the chip has a blind spot at the center. So this cannot be right, Bob.
IMO, it's pretty obvious that a microlens has an acceptable angle of view. Within which, the light will trigger the right response in the sensor. Beyond which, the light will behave in a way that will cause problems. Such as chromatic aberration, or that the neighbouring responds to light it should not respond to. In lenses with poor retrofocus design; ie. where the light hits the focal plane at a low angle, there should therefore be more problems than for lenses with a more proper retrofocus design. Apparently, some of the existing designs are not sufficient to solve this problem, even though they are good enough for film. cheers, Jostein ----------------------------- Pictures at: http://oksne.net ----------------------------- ----- Original Message ----- From: "Bob Blakely" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, August 09, 2003 7:05 PM Subject: Re: CCD light path angle redux > From: "Mark Erickson" <[EMAIL PROTECTED]> > > > It should be fairly clear from the figure at the bottom that light > striking > > the CCD perpendicular to the array gets focused on the sensor. What is > not > > shown is that light striking at an oblique angle will get focused adjacent > > to the sensor, not on it. > > This has to be baloney. Light *has* to strike the sensor at an oblique angle > or an image will not be formed! Only light along the axis of the lens will > be perpendicular to the array, and of this light, only the ray on axis will > be perpendicular. Of the rays forming a dot on the array along the lens > axis, even light from the edges of the aperture will be somewhat oblique. > Now, the question is: > > What oblique angle is acceptable to the array? > > This cannot be determined from the inaccurate cartoon provided. > > Regards, > Bob... > -------------------------------------------- > "Do not suppose that abuses are eliminated by destroying > the object which is abused. Men can go wrong with wine > and women. Shall we then prohibit and abolish women?" > -Martin Luther > >
