OK, I did a quick sketch to clarify what I said:
http://www.jcoconnell.com/temp/rearanglediagram.jpg Later, jco -----Original Message----- From: Derek [mailto:[EMAIL PROTECTED] Sent: Friday, September 09, 2005 4:36 PM To: [email protected] Subject: RE: First non DSLR digicam with 10MP APS sensor- contradiction Can I please get a diagram of this? Derek > Its very simple. If the working diameter of the rear element and the > diagonal size (format) of the sensor remain constant, then the further > the rear element is from the sensor the NARROWER the corner to corner > angle cone angle becomes eminating from the rear element and the > deviation from pendicular in the corner of the sensor becomes > smaller (better) as the lens is moved away. Do not confuse > this angle with the angle of view, they don't have to match > and will vary depending on optical design... > JCO > > -----Original Message----- > From: keith_w [mailto:[EMAIL PROTECTED] > Sent: Friday, September 09, 2005 2:18 PM > To: [email protected] > Subject: Re: First non DSLR digicam with 10MP APS sensor- contradiction > > > J. C. O'Connell wrote: > > > Isnt is a contradiction that the lens is CLOSER > > to the sensor and its an improvement because that > > means the light it hitting the corners of the sensor > > at a GREATER angle away from perpendicular which > > is BAD (perpendicular being ideal)? > > I don't understand. > The light cone exiting a lens assembly will have a certain value, in > degrees, total or half-angle, as you say, from the perpendicular. > > Move the lens along it's axis toward or further away from the sensor, > to > exactly cover the corners, it always has the same angle. The only thing > that changes is area of coverage. Not the angle of the exiting light bundle. > If you insist what you say is true, I have misunderstood you. Please > elaborate. > > keith whaley > > > > ---------------------------------------------------------------------- > ------ > > J.C. O'Connell mailto:[EMAIL PROTECTED] http://jcoconnell.com > > -------------------------------------------------------------------- > > -- > > ------ > >
