Archived posting to the Leica Users Group, 2006/11/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Yes, same optical formula. The legend is that the DRs were cherry picked off the assembly line. True but not for optical performance just for a specific focal length. John Collier On 27-Nov-06, at 4:45 PM, Leonard Taupier wrote: > John, > > That makes sense since the DR have to match the Bugeye extension > tubes. As far as I know though the 1st rigid including the DR have > the same lens formula. > > Len > > > On Nov 27, 2006, at 6:37 PM, John Collier wrote: > >> I can't remember all the details, or even my middle name half the >> time, but the DR lenses are all the same exact focal length. The >> rigid mount came in several variations to suit the slight focal >> length variations of the production line optical units. >> >> John Collier >> >> On 27-Nov-06, at 4:11 PM, Phil Swango wrote: >> >>> Marc Small wrote: >>>> I believe that the Rigid 2/5cm Summicron is identical >>>> optically to the DR/NF version of that lens, the only difference >>>> being in >>>> the lens mount, but I have never researched this and that could >>>> be a third >>>> design based on a common pattern. >>> >>> That's what Erwin Puts says too. I don't know if he's a reliable >>> source or >>> not. I've had both and couldn't see any difference.