I have used DAG. He is a person you can trust with difficult cases that others turn down. With the Zeiss Jena 5cm/2 LTM lens, he did two rounds of adjusting/cleaning for the same cost.Another well-known and expensive repairshop told me on the phone that the lens was not worth the expensive repair. I can endorse him with full confidence. The other case was a Canon 50mm/1.2lens that my local repairman could not fix after trying three times. Everything was out of focus. Don told me that an internal element had shifted, and since his repair of the Canon lens it has become one of my favorite lenses.
He was very easy to work with. I was overseas for 6 weeks while he repaired the Canon,and we stayed in touch via email. He kept the lens until I was a about to return home, and he timed the return of the lens with my return so that I would be home to receive the lens. It was his suggestion.
Raid