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Author Message   Glenn Middleton Rating: N/A Votes: 0 Posted on Tuesday, June 14, 2005 - 07:51 am:    The original Edixa M42 Thread spec dates from the days of preset lenses.From rough translations of early Pentax patents/specs it appears that the different stop point allowed the linkage in lens/camera to work better or be simpler.Why this would be so I cannot say.I would have thought that it was just a case of makers' individual take on a fitting,until it started to become universal.By that time Pentax was sweeping all before and that spec became the norm.How you fit Praktica into the equation I do not know. Of course a simple answer might be that some makers just copied the Edixa semi-auto mount configuration and others the Pentax.With a few noted exeptions,mostly in the semi-auto configuration,the specs are interchangeable. There is a similar story with the very early FED M39 mount.