Lens mount:

- PENTAX KAF mount

Angle of view:

- 76° - 29° (when used with PENTAX Digital SLR camera body)

Number of aperture blades:

- 6

Minimum aperture:

- F22 at 18mm, F38 at 55mm

Metering system:

- TTL open-aperture metering

Minimum focusing distance:

- 9.84 inches (0.25m)

Filter size:

- 52mm

Maximum magnification:

- 0.34X

Dimensions (diameter x length):

- 2.7 x 2.7 inches (68 x 67.5mm)

Weight (w/o hood):

- 7.9 oz. (225g)