One FLD and three aspherical elements control distortion and ghosting for a clearer final image, while the large aperture produces soft focus with excellent subject separation.
A physical aperture ring, depth-of-field/distance scales, and the lack of an AF/MF switch further contribute to the vintage aesthetics for a pleasant shooting experience.
This whole-lens focusing system features coils and magnets arranged in a circle to match the shape of the lens barrel. This minimizes any increase in outer diameter, resulting in a slim, high-torque autofocus mechanism that can be instantly switched to manual focus with a twist of the focus ring.
The autofocus performance is slower than an STM/HLA system, making it less suited to the demands of video autofocus.
- I-series lenses have all-metal construction that remains lightweight, resulting in a barrel that is equal parts elegant and durable.
- Knurled aperture and focus rings, along with an included knurled metal lens hood, further contribute to a pleasing tactile experience.
- A magnetic metal lens cap is included for streamlined lens protection that's easy to attach and remove.