The Sony A7 system was the first full mirrorless camera outside of the Lieca rangefinders, and its short flange distance made it possible to almost universally adapt to any lens to it. This includs Leica rangefinder lenses, making it the only other camera that could use these high quality light lenses, and at a fraction of the price of a Lieca camera. It was quickly discovered, however, that rangefinder lenses did not perform well on the stock Sony A7’s due to Sony’s inclusion of a very thick sensor filter, which introduced significant blur on the corners when using rangefinder or even SLR film lenses. We have developed a service that replaces the Sony A7 series cameras’ normally thick sensor glass with a thin-filter replacement that performs better with Leica lenses, film lenses, and non-Sony lenses, significantly improving corner sharpness.