@Alexander6x6 the original Zeiss Planar for Hasselblad used a 6/4 formula until 1962, with serial numbers under 4 000 000 and distinctive name ring. This was followed by the more common 7/5 lens. There is also the CB Planar in a 6/5 formula.
I can't follow you. The Planar's optical scheme has never been changed. There have only been improvements, including T* multicoating and, if I recall correctly, better characteristics for digital sensors.
There were 2 versions of the 7/5 Planar 2.8/80, there was a change in the optics somewhere between the C and CF versions. Early C versions have a larger front element than the CF versions. There was a later 6/5 C-Planar 2.8/80 made for the 501C kit. On film, I've not noticed any difference between them, except the improvements in the T* over time.
Zeiss Rollei lenses also used the first 2 versions.
OK! I think I got this wrong before, probably on this forum. OAPOIi is correct, the 1st version of the Hasselbald 2.8/80 was probably 6/4.
(from marcocavina.com)
Took me a while to dig this up - I had one of these earlier ones, and remember counting the reflections, thinking 7/5, but that was a long time ago and I probably got it wrong.
@Alexander6x6 the original Zeiss Planar for Hasselblad used a 6/4 formula until 1962, with serial numbers under 4 000 000 and distinctive name ring. This was followed by the more common 7/5 lens. There is also the CB Planar in a 6/5 formula.