I just bought the "Fat" 90 f2.8 Tele-Elmarit and just beginning to put it thought it's paces today. Great looking lens for the age and front and rear glass looks good. The only complaint, and it may just be inherent in the lens, is the long and somewhat stiff focus, especially from about 20 feet to Infinity. Is this par for this lens or is it due for a bit of CLA? I believe it was made circa 1969 with a serial number of 234XXXX.