I was just perusing the B&H web site, looking at the Rollei 2.8GX. There was a recent discussion about what was better, Planars, Xenotars, etc., etc. (One of those discussions.) The discussion included talk about the 5 element Planar as used in the TLR versus the 7 element Planar used in the SLRs. So in looking at the specs for the 2.8GX, B&H says that the Planar lens is a 2 group, four element lens. Is this correct? If so, what specifically is the difference between this 4 element version and the 5 element version (other than obviously one fewer lens element). Oh, I also noted that B&H refers to the lens as a "Zeiss Planar" over and over. I thought Rollei made the lens under license to Zeiss-but Zeiss did not actually make it. (Sorry to bring this up again, but it bugs me that they advertise Rollei made lenses as "Zeiss" lenses. Not that it makes any practical difference, of course....) Anyway, I am mostly curious about the lens design on the 2.8GX Planar. Thanks.