Product Specifications
The lens focuses on the relationship between spherical aberration and bokeh and allows arbitrary control of under- and overcorrection of spherical aberration to produce a wide variety of bokeh expressions.
The lens construction is of the HELIAR design with six elements in three groups and large aperture of F1.8. Spherical aberration is controlled both by the spherical aberration control ring and by the aperture. In images under-corrected, the centre of focus is soft-focus with flares in the highlights. The rear bokeh is gently rendered. In over-corrected images, on the other hand, the centre of focus remains and the after-blur is bubbly. These tendencies have been regarded as defects that should be corrected from the point of view of ideal optical design, but this lens was planned and designed with the aim of making the characteristics of spherical aberration lead to unique photographic expression. Fluctuating spherical aberration will, in optical principle, also shift the focus position, but this issue has been addressed by incorporating a mechanism that cancels out the misalignment by changing the distance between the internal lens groups in conjunction with the control ring. When operating the control ring, a small finger point is provided at the position where the left thumb touches it, allowing the approximate state of correction to be known tactilely.
The lens is equipped with electronic contacts to enable telecommunication between the lens and the body. In combination with the body of the Canon EOS R system, it supports Exif information, in-body image stabilization (3 axes)*1, as well as three types of focus assist functions (magnification view, peaking, and focus guide*2) (*In some cases, it does not work when the control ring is turned extremely).
The metal focus ring has a diamond knurled pattern for excellent grip. The high-precision metal helicoid provides a silky, greased operating feel even when the focusing. The aperture is controlled by the lens, not by a command dial on the camera. The lens has a nine-element aperture, which allows the out-of-focus parts of point light sources to be rendered in a well-defined shape.
*1 Valid only on bodies equipped with in-body image stabilization.
*2 Excluding EOS RP.
Main Features
- Various bokeh expressions with the spherical aberration control ring
- Compatible with Canon RF mount cameras
- Highly rigid and durable all-metal lens barrel
- Manual focus for reliable focusing
- Beautiful bokeh with 9 aperture blades
