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 64535mm F3.5~21mm-equivalent
- smc Pentax-A 64545mm F2.8🔗28mm-equivalent
- smc Pentax-A 645 Zoom45–85mm F4.5~28–50mm-equivalent
- smc Pentax-A 64555mm F2.8~35mm-equivalent
- smc Pentax-A 64575mm F2.8🔗~45mm-equivalent
- smc Pentax-A 645 Zoom80–160mm F4.550–100mm-equivalent
- smc Pentax-A 645 Macro120mm F475mm-equivalent
- smc Pentax-A 645150mm F3.5~95mm-equivalent
- smc Pentax-A 645200mm F4~125mm-equivalent
- smc Pentax-A★ 645300mm F4 ED [IF]~185mm-equivalent
- smc Pentax-A★ 645600mm 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 LS75mm F2.8~45mm-equivalent
- smc Pentax 645 LS135mm 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 Zoom33–55mm F4.5 AL~20–35mm-equivalent
- smc Pentax-FA 64535mm F3.5 AL [IF]~21mm-equivalent
- smc Pentax-FA 64545mm F2.828mm-equivalent
- smc Pentax-FA 645 Zoom45–85mm F4.5~28–50mm-equivalent
- smc Pentax-FA 645 Zoom55–110mm F5.6~35–70mm-equivalent
- smc Pentax-FA 645 Zoom80–160mm F4.550–100mm-equivalent
- smc Pentax-FA 645 Macro120mm F475mm-equivalent
- smc Pentax-FA 645150mm F2.8 [IF]~95mm-equivalent
- smc Pentax-FA 645 Zoom150–300mm F5.6 ED [IF]~95–185mm-equivalent
- smc Pentax-FA 645200mm F4 ED~125mm-equivalent
- smc Pentax-FA 645300mm F5.6 ED [IF]~185mm-equivalent
- smc Pentax-FA★ 645300mm F4 ED [IF]~185mm-equivalent
- smc Pentax-FA 645400mm 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 64525mm F4 AL SDM AW [IF]~20mm-equivalent
- smc Pentax-DA 64525mm F4 AL SDM AW [IF]~20mm-equivalent
- HD Pentax-DA 64528–45mm F4.5 ED AW SR~22–35mm-equivalent
- HD Pentax-D FA 64535mm F3.5 AL [IF]~28mm-equivalent
- smc Pentax-D FA 64555mm F2.8 AL SDM AW [IF]~45mm-equivalent
- HD Pentax-D FA 645 Macro90mm 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 Petzvar120mm F3.875mm-equivalent
References
- Pentax 645 Lenses on Wikipedia
- Pentax 645 on Camera-Wiki
- Pentax 645Z Special site on Ricoh-Imaging.co.jp
- Lens mount list on Wikipedia
- Ivanichek Petzvar lens on Ivanichek.com
Last update 5. 12. 2022.