ULTIMAXX 25mm f/1.8 Manual Lens for Sony E Mount (Nex)Short Description Compact designed for APS C format Sony E mount mirrorless cameras and provides a 37. 5mm equivalent focal length. Bright f 1. 8 maximum aperture benefits working in difficult lighting conditions and also offers improved control over depth of field for selective focus applications. Rounded 12 blade diaphragm makes for a smooth and pleasing quality of out of focus blur in a photograph Multi coated anti reflection design delivers