Don't know where you got the idea that some camera lenses have no focal point. All I pointed out is that in telecentric lenses, the primary light rays leave the exit pupil in parallel lines. That is the idea conveyed in both of these sites.
Cliff Benham johnwillkie wrote:
Bad guess. I visited both sites, scanned both pages. I saw, on BOTH, a lens diagram with a focal point, and what appeared to be an image that was upside down from the source. What subtle issue did I miss with these instrumentation cameras? How macro-focusing desires all too easily lead to "bug's eye" lenses?John Willkie------------------------------------------------------------------------*De:* opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] *En nombre de *flyback1*Enviado el:* Wednesday, June 20, 2007 12:42 PM *Para:* opendtv@xxxxxxxxxxxxx *Asunto:* [opendtv] Re: Red camera lensesjohnwillkie wrote: Thee are lenses without focal points?John Willkie------------------------------------------------------------------------*De:* opendtv-bounce@xxxxxxxxxxxxx <mailto:opendtv-bounce@xxxxxxxxxxxxx> [mailto:opendtv-bounce@xxxxxxxxxxxxx] *En nombre de *flyback1*Enviado el:* Saturday, June 16, 2007 12:52 PM *Para:* opendtv@xxxxxxxxxxxxx <mailto:opendtv@xxxxxxxxxxxxx> *Asunto:* [opendtv] Re: Red camera lensesRead about Telecentric lenses:http://www.lhup.edu/~dsimanek/3d/telecent.htm <http://www.lhup.edu/%7Edsimanek/3d/telecent.htm>http://www.computeroptics.com/telecentric.html I guess you didn't bother to open and read from either URL...
