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Pentax 645 mount lenses

Pentax 645 mount lenses

Pentax 645 mount was developed by Pentax in the early 1980s, and released in 1984 with Pentax 645 camera. It is a bayonet mount with three tabs made for medium format film, with a focal flange distance of 70.87mm and a throat diameter of 61.2mm. Mount supports electric and digital communication, film and digital sensors with an aspect ratio of 4:3, for a 6×4.5cm film format. The aperture is controlled mechanically, with a lens clutch. Focus can be achieved manually, as well as automatically – mount supports screw-drive and digital focus control with lenses with built-in focus motors. There is support for in-lens stabilization.

There are three film bodies and two digital bodies. Film bodies include the original, manual focus 645, and later models — 645N and 645N II, with autofocus support when used with FA 645-series lenses. Digital bodies are the original 645D with a 40mpx Kodak CCD sensor, and the later 645Z with a 51mpx Sony CMOS sensor, both 44×33mm in size.

Compared to the usual 35mm format, the approximate crop factor of Pentax 645 mount lenses is 0.62× for film-era full-frame lenses and 0.79× for digital bodies with 44×33mm sensors.

Jump to: A645, Leaf shutter lenses, FA645, DFA645 and DA645 lenses, 3rd party lenses.

Pentax-A 645 lenses

A 645 series lenses are manual focus, auto-aperture lenses, the functional equivalent of Pentax K-mount A series lenses.

  • smc Pentax-A 645 35mm F3.5 ~21mm-equivalent
  • smc Pentax-A 645 45mm F2.8 🔗 28mm-equivalent
  • smc Pentax-A 645 Zoom 45‍–‍85mm F4.5 ~28‍–‍50mm-equivalent
  • smc Pentax-A 645 55mm F2.8 ~35mm-equivalent
  • smc Pentax-A 645 75mm F2.8 🔗 ~45mm-equivalent
  • smc Pentax-A 645 Zoom 80‍–‍160mm F4.5 50‍–‍100mm-equivalent
  • smc Pentax-A 645 Macro 120mm F4 75mm-equivalent
  • smc Pentax-A 645 150mm F3.5 ~95mm-equivalent
  • smc Pentax-A 645 200mm F4 ~125mm-equivalent
  • smc Pentax-A★ 645 300mm F4 ED [IF] ~185mm-equivalent
  • smc Pentax-A★ 645 600mm F5.6 ED [IF] ~370mm-equivalent

Leaf shutter lenses

Lenses labelled as LS have leaf shutters built-in, using flash with those lenses is possible for all speeds of their shutters, up to 1/500s. LS lenses are missing an A setting on the aperture ring, preventing the camera from using Program and Shutter priority modes.

  • smc Pentax 645 LS 75mm F2.8 ~45mm-equivalent
  • smc Pentax 645 LS 135mm F4 ~85mm-equivalent

Pentax-FA 645 lenses

FA 645 series lenses support screw-drive driven autofocus and are the functional equivalent of Pentax K-mount FA series lenses.

  • smc Pentax-FA 645 Zoom 33‍–‍55mm F4.5 AL ~20‍–‍35mm-equivalent
  • smc Pentax-FA 645 35mm F3.5 AL [IF] ~21mm-equivalent
  • smc Pentax-FA 645 45mm F2.8 28mm-equivalent
  • smc Pentax-FA 645 Zoom 45‍–‍85mm F4.5 ~28‍–‍50mm-equivalent
  • smc Pentax-FA 645 Zoom 55‍–‍110mm F5.6 ~35‍–‍70mm-equivalent
  • smc Pentax-FA 645 Zoom 80‍–‍160mm F4.5 50‍–‍100mm-equivalent
  • smc Pentax-FA 645 Macro 120mm F4 75mm-equivalent
  • smc Pentax-FA 645 150mm F2.8 [IF] ~95mm-equivalent
  • smc Pentax-FA 645 Zoom 150‍–‍300mm F5.6 ED [IF] ~95‍–‍185mm-equivalent
  • smc Pentax-FA 645 200mm F4 ED ~125mm-equivalent
  • smc Pentax-FA 645 300mm F5.6 ED [IF] ~185mm-equivalent
  • smc Pentax-FA★ 645 300mm F4 ED [IF] ~185mm-equivalent
  • smc Pentax-FA 645 400mm F5.6 ED [IF] ~250mm-equivalent

Pentax-D FA 645 and DA 645 lenses

The latest series of lenses is optimised from the ground up for digital sensors. While most of the lenses fully cover a 6×4.5cm film frame, leading to the D FA 645 designation, two of the lenses carry the DA 645 designation, indicating that their image circle covers only the smaller size of the sensor, making them unsuitable for film cameras.

  • smc Pentax-D FA 645 25mm F4 AL SDM AW [IF] ~20mm-equivalent
  • smc Pentax-DA 645 25mm F4 AL SDM AW [IF] ~20mm-equivalent
  • HD Pentax-DA 645 28–‍45mm F4.5 ED AW SR ~22–‍35mm-equivalent
  • HD Pentax-D FA 645 35mm F3.5 AL [IF] ~28mm-equivalent
  • smc Pentax-D FA 645 55mm F2.8 AL SDM AW [IF] ~45mm-equivalent
  • HD Pentax-D FA 645 Macro 90mm F2.8 ED AW SR ~70mm-equivalent

Notable 3rd party Pentax 645 lenses

These lenses aren’t always exclusively made in the Pentax 645 mount, but they have a native Pentax 645 mount and are usually available brand new. Ivanichek Petzvar is a fully manual lens, with no aperture information transferred to the camera.

  • Ivanichek Petzvar 120mm F3.8 75mm-equivalent

References

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Last update 5. 12. 2022.