Used Hasselblad 21mm f/4 XCD Lens

The XCD 21mm is an ultra wide-angle lens for the X System. Its extremely short focal length provides a 17mm full frame equivalent lens, making it perfect for landscape and architecture photography. The lens features a 32 cm close distance setting (1:10 image scale) and an aperture range between 4 and 32. The XCD 21mm features full automatic focusing as well as instant manual focus.

All XCD lenses contain a lens shutter delivering shutter speeds from 60 minutes to 1/2000 second. Synchronizing with flash at all speeds allows full creative freedom when mixing flash and daylight. The lens shutter also generates very little vibration providing hand-held shots with perfect sharpness.

Entrance Pupil Position
The entrance pupil position is the correct position of the axis of rotation when making a panorama image by combining individual images of a scene.

MTF
Modulation Transfer as a function of image height at infinity and close range settings. Sagittal slit orientation drawn with continuous line and tangential with dashed. White light. Spatial frequencies 10, 20 and 40 lp/mm.