Focus
Autofocus
Mount
Pentax 645
Format
645 medium format
Groups
8
Elements
12
Weight
1070g
Filter Thread
40mm
Spec Notes
Digital-era ultrawide, 2 aspherical, SDM AF, weather-sealed. 40.5mm REAR drop-in (no front thread). For 645D/645Z.
Max Aperture
f/4
Min Focus Distance
40cm
Aperture Blades
9
Introduced
2010