The zeiss 85mm f14 t planar zf2 lens is is optimized for medium to longer distances and provides distortion free performance which only improves as the lens is stopped down the fast f14 aperture is very useful for creatively controlling the depth of field and the nearly circular diaphragm creates a pleasing bokeh in the out of focus areas the planar t 1485 is designed for use with full frame slr and dslr cameras and when combined with a dslr with a 15 crop factor the lens become