I do modifications on big to medium lens, the last one modified Moller 63/2x minimum fd was 1,8m (6ft) until couple of days ago, when modified even further, haven't tested it yet. The price of modification for lens is 250-500€. Optional rehousings available. Waiting time 30-60 days. Servicing starts at 85€, waiting time 7-14 days. You pay shipping charges both ways.