Pentax 645Z
Real Sensor Data
- Brand
- Pentax
- Sensor Format
- MF 44x33
- Resolution
- 51.4 MP
- Pixel Pitch
- 5.29 microns
- Circle of Confusion
- 0.0365 mm
- Crop Factor
- 0.79x
- Announced
- 2014
Released in 2014, the 645Z is the oldest camera on this site's reference, and it remains genuinely relevant a decade later — a medium-format DSLR that disrupted the format's pricing when it launched, bringing 51.4-megapixel medium-format image quality to a price point dramatically below what medium format had traditionally cost.
Pentax 645Z sensor specs
- Sensor
- MF 44x33
- Resolution
- 51.4 MP
- Pixel dimensions
- 8,278 × 6,209 px
- Aspect ratio
- 4:3
- Pixel pitch
- 5.29 µm
- Crop factor
- 0.79x
- Circle of confusion
- 0.0365 mm
Medium Format sensor · DoF & Hyperfocal Calculator · Astro 500/NPF Calculator
The 645Z also introduced genuinely fast Live View autofocus for a medium-format body at the time, a real usability improvement over the notoriously slow contrast-detect systems that had defined medium-format autofocus performance in earlier generations from Pentax and its competitors alike. A real, practical usability advance for a format historically defined by slow, frustrating autofocus. A genuinely welcome change for working photographers.
Pentax also built genuinely thorough weather sealing into the 645Z, a real practical advantage for landscape photographers shooting medium-format work in harsh outdoor conditions. A real, practical field advantage.
See these numbers used live in the DoF & Hyperfocal Calculator by selecting the MF 44x33 sensor format.
Frequently Asked Questions
Is a 2014 medium-format camera still competitive against modern bodies?
Its sensor specs and calculator figures remain fully accurate, and 51.4 megapixels on a genuinely large medium-format sensor still comfortably exceeds most real printing and cropping needs — its main disadvantages against newer bodies are autofocus sophistication and video features, not core still-image resolution or quality, and it remains a genuine value option on the secondhand market.