The Heliar Portrait 75mm F1.8 is a large-aperture manual focus medium telephoto lens, exclusive to Nikon Z-mount and Canon RF-mount, and the first Voigtländer full-frame interchangeable lens to incorporate a spherical aberration control mechanism. It covers the full-frame image circle, with an optical design optimized for the image sensors of Nikon and Canon mirrorless cameras. This lens focuses on the relationship between spherical aberration and bokeh, enabling the deliberate control of under-correction and over-correction states to produce diverse bokeh expressions.
Despite its Heliar-type construction with 6 elements in 3 groups, it achieves a large maximum aperture of F1.8. While changes in spherical aberration occur with aperture adjustment, operating the new control ring allows enjoyment of bokeh rendering with unprecedented variation. While varying spherical aberration optically shifts the focus position, this lens addresses this challenge with a mechanism that changes the spacing between lens elements in tandem with the control ring to counteract the shift. A small finger point protrusion is placed where the left thumb naturally rests during control ring operation, allowing the approximate correction state to be sensed tactilely.
This lens incorporates electronic contacts, reflecting lens usage in the Exif data of captured images. It also supports in-body image stabilization and focus assist functions. The minimum focusing distance is 0.7m, and focusing is manual focus only.The focus ring's metal finish features a straight knurled pattern for the Nikon Z mount and a diamond pattern for the Canon RF mount.
