Archived posting to the Leica Users Group, 1999/07/30
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]So adding 1 or 2 elements to the original Planar 5-element design still leaves it a Planar correct? Peter K - -----Original Message----- From: Erwin Puts [mailto:imxputs@knoware.nl] Sent: Friday, July 30, 1999 2:24 PM To: leica-users@mejac.palo-alto.ca.us Subject: [Leica] correction for previous post on lens design I wrote: "On a very broad perspective one can argue that all lenses (except the zoom lenses) are all based on one design, the triplet (the Planar is a triplet too! 3 lens groups,identical to the Taylor layout)" Here I was too quick. The more complete reasoning is this. There are triplets with a 2-2-1 configuration. Adding one lens in front makes it a 1-2-2-1 version, This is the Planar, which of course has four groups. Not three as I noted by a wrong count. It is 30 degrees C now.Not an excuse of course. Erwin