From Phase One, the 32mm W and 50mm W.
The “W” designation refers to one of the (at least) three potential definitions of “wide”. In this case, it refers to a large (90mm) image circle. Then32mm is described as being “ultra wide angle”, the second potential definition, with a 107 degree field of view. Strangely, the 50mm lens, with a quoted 84 degree field of view is described as having a “standard” field of view. For reference, 84 degrees is the horizontal field of view of a full frame camera with a 20mm focal length lens.
The new lenses are
tilt lenses without shift. Shift is provided by the camera body. The 50 mm lens is described by Phase One as "a playful accompaniment to a standard lens" — whatever that means. You can find an
announcement which mirrors
Phase One specifications and descriptions at Capture Integration.
The current Rodenstock
digital lens series nomenclature is defined by image circle diameter range and not the angle of coverage as in years past nor the angle of view.
The
W-series (wide) of Rodenstock HR Digaron digital lenses refers to an image circle diameter range of 88–100 mm. They range in focal length from 32–70 mm. The
SW-series (super wide) has an image circle diameter range of 110–120 mm.
Phase One communicates lens specifications poorly. They list the image angle
(angle of coverage) for the entire image circle diameter (in this case 90 mm, like a 72 x 54 mm format would have as an image diagonal) and call it
angle of view, instead of specifying the actual angle of view for the image diagonal of the sensor format (66.72 mm for the 53.4 × 40 mm sensor format). It makes for unnecessary confusion which could be avoided by providing proper labeling and sufficient details in their specifications.
The angle of view produced
on the sensor for the
nominal focal length is 67° with the HR Digaron-W 50 mm. It's equivalent to a focal length 32 mm on a 36 x 24 mm full-frame sensor. For the specifications of this lens, they use the nominal focal length of 50 mm, but the actual focal length is 51.68 mm.
The angle of view produced
on the sensor for the
actual focal length of 33.09 mm is 90° with the HR Digaron-W 32 mm. It's equivalent to a focal length 21 mm on a 36 x 24 mm full-frame sensor. For the specifications of this lens (to make things as inconsistent and confusing as possible), they use the actual focal length of 33.09 mm, instead of the nominal focal length which they use for some lenses but not others.
Why Phase One lens specifications and labeling are so sloppy, I have no idea.
