I agree that the Ensar lenses are certainly of the highest quality,I am perfectly happy using my cameras with the Ensar, but my Commando, which is from 1948, has an episolon shutter with a top speed of 1/300 with a 3.5 ensar lens, in fact every post war ensign I have with the xpress lens has a top speed of 1/300 bar my 820 which has a top speed of 1/200, and I had a 16/20 that had the xpress lens and an episolon with a top speed of 1/400, there must have been some variation in the cameras,
Richard