Adapting legacy manual focus lenses to your interchangeable lens digital camera means that you are not only giving yourself the chance to select a lens from thousands of mainly low-priced options offered by different manufacturers, or picking one that is not available from your current camera brand range, but also giving yourself the choice of lenses which have been acknowledged to have outstanding optical qualities.
An example of a very good and compact lens for adaption to mirrorless digital camera bodies is the Zuiko FT 38mm 1:1.8, or officially the F.Zuiko Auto-S 50mm 1:1.8. The lens is from the series produced for Olympus Pen F/FT, the half-frame SLR camera system that was designed with a body thickness and focal flange distance almost resembling current mirrorless digital cameras.
The 38mm 1:1.8 is 6 elements in 5 groups construction, comes with a 5-bladed diaphragm, and is lightweight at 135 grams. The minimum focus distance is a short 0.35 meters and filter threads are standard 43 mm. The lens is said to have a degree of softness which seems to be the main trait of Olympus manual focus lenses, characteristic neutral mid-tone colors, and a pastel creaminess to the backgrounds that adds to the classic touch of the images.