The 135mm focal length occupies a curious position in the portrait photographer’s arsenal. Long enough to fully compress a face from a comfortable working distance, fast enough at f/1.8 to produce background separation that rivals shorter, wider-aperture alternatives — it is the choice of photographers who have thought carefully about what they actually want rather than what specifications suggest they should want. Sony’s FE 135mm f/1.8 GM is the best lens in this category.