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Author Message   Glenn Tinkerer Username: Glenn Post Number: 1014 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Friday, June 08, 2012 - 06:52 am:    John, Two questions:- So your mount is of the nFD type, ie you press a button/catch before turning lens anti-clockwise to remove it? In pic 1 is the lens turned clockwise as far as it will go and apart from the radial displacement, does the lens look fully seated on the body, ie no lean or droop when viewed from top or side? Pretty sure the hang up is situated at the interface of male and female mount rings, just need to be sure. If one is completely ham fisted and a lot of brute force is used, it is possible to cause the iris 'actuating' levers to jam a nFD lens on the Canon body. However, in this situation the 'levers' in the lens box are bent to buggery! since you state care and no force was used, I do not consider this is the cause of your jam.