On 15 Mar 2004 at 18:39, frank theriault wrote: > AFAIK, the human eye does not "alter its focal length by changing it's > shape". It doesn't alter it's focal length at all! Unless I'm in the > minority in being unable to zoom in and out. <g> > > I guess they meant focus?
No, it changes it's FL by modifying the lens shape. Since the lens to retinal distance is effectively fixed objects can only be focused by altering the FL. http://www.sasked.gov.sk.ca/docs/physics/u6a12phy.html Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
