45mm focal length f/1.2 aperture (equates to 90mm f/2.4 in full frame field of view and depth of field (DOF))
weathersealed - dustproof, splashproof, and freezeproof (down to 14°F/-10°C)
manual focus clutch
customisable lens function button
Z Coating Nano technology
internal focus, stepper AF motor
MSC (Movie- and Still-Compatible) autofocus mechanism that provides virtually silent and smooth high-speed focusing performance
close focus 0.5m (19.7“) giving 0.1x macro
designed for feathered bokeh with the design approach which gives attractive bokeh without any of the light loss causes by the use of apodization filters in Fujifilm's APD or Sony's STF lenses
14 elements in 10 groups including 1 ED, 4 HR, 1 aspherical - three optimally placed and bonded lens elements, including one ED lens, which compensate for typical problems on wide-aperture lenses like out-of-focus color bleeding (axial chromatic aberration) and peripheral color bleeding (magnification chromatic aberration).
Sharpness at F1.2 is even from center to the edges of the image, significantly sharper than the older but highly respected 45mm F1.8 lens, and seems to be maximal at f/2.8
very minor trace of chromatic aberration at f1.2. There is almost no distortion observed.
Stopping down to F5.6, image shot with the 45mm PRO lens is almost flawless. Incredible level of sharpness, and almost no noticeable flaw.
superbly fast AF and extremely accurate
the one thing that made me fall in love with the lens, is how the rendering characteristics of the images by this 45mm PRO lens look … there is an extra dimension to the images that I did not see in my frequently used 45mm F1.8 lens, or any other lenses.