On Wed, 12 Oct 2005, Godfrey DiGiorgi wrote:
My understanding is that the Pentax 50mm f/1.4 was updated between the M and A series, and the A series optical formula is the same through F and FA series.
The K is different again.
By contrast, the 50mm f/1.7 was the same from the M series onwards.
And there was no pre-M 1.7. http://kmp.bdimitrov.de/lenses/primes/normal/index.html Kostas
