The Pentax 645Z — the 2014 51.4 MP medium format CMOS DSLR with 86 weather seals — carries an estimated ~100,000-actuation shutter rating. The count can be extracted from PEF RAW files using ExifTool, though PEF is not yet supported in the shuttercount.app browser tool.
Check Shutter Count →The Pentax 645Z (May 2014) was a landmark camera: the first medium format body to use a CMOS sensor at a sub-$10,000 price, making medium format accessible to a far wider range of photographers. Its 51.4 MP CMOS sensor (44×33 mm) enabled ISO 204800 extended sensitivity, live view with contrast-detect AF, and 1080p Full HD video — capabilities impossible with the CCD-based Pentax 645D predecessor. The 645Z uses the 645AF II autofocus system with 27 phase-detect points, shoots 3 fps, and is sealed against dust and weather with 86 sealing points. It accepts the entire Pentax 645 lens family spanning over four decades.
Pentax does not publish an official shutter rating for the 645Z. Consistent with medium format DSLR conventions, the shutter life is estimated at approximately 100,000 actuations.
| Model | Release | Sensor | Est. Shutter Life | RAW Format |
|---|---|---|---|---|
| Pentax 645Z | 2014 | 51.4 MP CMOS MF (44×33 mm) | ~100,000 | PEF / DNG |
| Pentax 645D (predecessor) | 2010 | 40 MP CCD MF (44×33 mm) | ~100,000 | PEF / DNG |
| Fujifilm GFX 50S (competitor) | 2017 | 51.4 MP CMOS MF (44×33 mm) | ~150,000 | RAF |
exiftool -ShutterCount yourfile.PEF in a terminal. Pentax consistently embeds the shutter count in PEF MakerNote data across all modern 645-series bodies.| Actuation Count | % of Est. Life | Assessment |
|---|---|---|
| 0 – 5,000 | 0 – 5 % | Very low use — near new |
| 5,000 – 30,000 | 5 – 30 % | Low use |
| 30,000 – 65,000 | 30 – 65 % | Moderate to heavy use |
| 65,000 – 85,000 | 65 – 85 % | High use — negotiate price |
| 85,000 + | 85 %+ | Near or past estimated life |
The 645Z (2014) replaces the 645D’s CCD sensor with a 51.4 MP CMOS, enabling ISO 204800 (vs. ISO 1600 max on the 645D), live view with usable AF, 1080p video, and significantly improved dynamic range. The optical viewfinder and autofocus system are shared between both bodies, as is the 645 lens mount. On the used market, the 645Z is priced considerably higher than the 645D but represents a very substantial performance improvement.
The Pentax 645Z accepts the entire 645AF II lens family, covering over 20 native 645AF lenses including D FA lenses (with weather sealing), FA lenses (older but optically excellent), and A series lenses (fully mechanical). Over 60 Pentax 645 lenses are available, spanning from ultra-wide 28mm fisheye to 1000mm super-telephoto in medium format field of view. The 645Z is fully compatible with older manual-focus 645A lenses via a simple adapter.
Yes — a major advancement over the CCD-based 645D. The 645Z uses contrast-detect AF in live view, suitable for deliberate landscape and studio work. Phase-detect AF through the optical viewfinder is faster at 27 points, but the live view AF opened up tethered shooting and macro applications that were impractical on the 645D.
Yes, for photographers who want affordable access to medium format image quality and value the 645 lens ecosystem. The 645Z delivers exceptionally detailed RAW files with beautiful tonal gradation, making it a favourite for landscape, architectural, and portrait photographers who work primarily from a tripod or in controlled studio conditions. The main practical limitations are its size and weight (1470 g) and the slower live view AF compared to modern mirrorless medium format cameras.