| Processor | PRIME IV w/accelerator unit | PRIME III | PRIME II |
| Exposure Modes | Auto (green), HyP, Sv, Av, Tv, TAv, HyM, X, B, User(5) | HyP, Sv, Av, Tv, TAv, HyM, X, B | HyP, Sv, Av, Tv, TAv, HyM, X, B |
| Program Modes | Auto, Normal, Action, Depth of Field (deep/shallow), MTF priority | Auto, Normal, Action, Depth of field (deep/shallow), MTF | Auto, Normal, Action, Depth of field (deep/shallow), MTF |
| Scene Modes | None. Auto (green) sets exposure based on scene analysis | None | None |
| Restrictions | Exposure modes with M and K lenses are restricted to Av (with aperture always wide open) and M (with stop-down metering) | | |
| Shutter Speeds (Auto) | 30s - 1/8000s (stepless) | 30s - 1/4000s (stepless) | 30s - 1/4000s (stepless) |
| Shutter Speeds (Manual) | B, 30s - 1/8000s. Up to 20 minutes in Timed Bulb mode. Up to 300s in Astrotracer mode | B, 30s - 1/4000s | B, 30s - 1/4000s |
| High ISO NR | Off, Auto, Low/Medium/High, Custom by ISO | | |
| Slow Shutter NR | Off, Auto, On | | |
| Shutter Life | 300,000 | 100,000 | 50,000 |
| Maximum FPS | 4.4 (6.5 in crop mode) | 3 | 1.1 |
| Continuous Shooting | Full frame: H: 4.4 fps (70 JPG, 17 RAW) M: 3.0 fps (100 JPG, 20 RAW) L: 0.7 fps (100 JPG, 100 RAW)
APS-C crop: H: 6.4 fps (100 JPG, 50 RAW) M: 3.0 fps (100 JPG, 70 RAW) L: 1.0 fls (100 JPG, 100 RAW) | Hi: 3 fps up to 30 JPG or 10 RAW frames Lo: 1 fps up to 300 JPG or 25 RAW frames | 1.1 fps up to 13 frames at 40MP RAW, 1.1 fps up to 15 frames at 40MP JPEG |
| Exposure Compensation | +/-5 EV (+/-2 EV in movie mode) | +/-5 EV (+/- 2 EV in movie mode) | +/-5 EV |
| Auto Bracketing | Exposure (2, 3 or 5 frames), one-push EV bracketing, AA filter (2 or 3 frames) | Exposure (2, 3 or 5 frames), one-push EV bracketing | Exposure (2, 3 or 5 frames), one-push EV bracketing |
| Expanded Dynamic Range | Highlight (auto, on, off),
Shadow (auto, high, medium, low, off) | Highlight (auto, on, off),
Shadow (auto, high, medium, low, off) | Highlight (on, off),
Shadow (high, medium, low, off) |
| Metering Sensor | 86K Pixel | 86K Pixel | 77-Segment |
| Meter Range | -3 to 20 EV | -1 to 21 EV | 2 to 21 EV |
| Meter Pattern | Multi-Segment,Center Weighted,Spot | Multi-Segment,Center Weighted,Spot | Multi-Segment,Center Weighted,Spot |
| Exposure Lock | Yes | Yes | Yes |
| Self Timer | 2 s with mirror lock-up, 12 s | 2 s and 12 s | 2 s with mirror lock-up, 12 s |
| Interval Shooting | Up to 2000 frames, 2 sec to 24 hours interval | Up to 2000 frames, 2 sec to 24 hours interval | Up to 999 frames, up to 24 hours between frames |
| Mirror Lock-up | Yes | Yes | Yes |
| HDR Mode | Yes | Yes | No |
| Multiple Exposures | Yes, average, additive and bright, 2 to 2000 shots | Yes, average, additive and bright, 2 to 2000 shots | Yes |
| Pixel Mapping | Yes | Yes | Yes |
| Mount | KAF2 (no aperture coupler) | 645 AF2 | 645 AF2 |
| Composition Adjustment | Yes | No | No |
| Supported Lenses | All Pentax K-mount lenses. Manual focus only with K-, M-, and A-series lenses. Stop down metering only with K- and M-series lenses. M42, Pentax 645 and Pentax 6x7 lenses with the appropriate adapters (stop down metering and manual focus only). | All Pentax 645 lenses. Pentax 6x7 lenses with adapter (retains open aperture metering) | All Pentax 645 lenses. Pentax 6x7 lenses with adapter (retains open aperture metering) |
| Stabilization | Yes (sensor-shift SR II) | No (select lenses stabilized) | No (select lenses stabilized) |
| Autofocus (viewfinder) | Yes (SAFOX 12, 33 focus points (25 cross type)) | Yes (SAFOX 11, 27 focus points (25 cross type)) | Yes (SAFOX IX+, 11 focus points (9 cross type), light wavelength sensor) |
| AF Points | 33 | 27 | 11 |
| Autofocus Sensitivity | -3 to 18 EV | -3 to 18 EV | -1 to 18 EV |
| Autofocus With SDM | Yes | Yes | Yes |
| Autofocus Assist | Dedicated LED | N/A | N/A |
| Autofocus Modes | Single Shot, Continuous, Auto, Expanded area (S, M, L), Zone select, User select | | |
| Front/Back Focus Corr | Yes (adjustment for up to 20 lenses) | Yes (adjustment for up ro 20 lenses) | Yes (adjustment for up to 20 lenses) |
| Power Zoom | Supported (zoom only) | Not supported | Not supported |
| Lens Correction | Distortion,Lateral Chromatic Aberration,Vignetting,Diffraction | Distortion,Lateral Chromatic Aberration,Vignetting,Diffraction | Distortion,Lateral Chromatic Aberration,Vignetting |
| Built-in Flash | No | No | No |
| Sync Speed | 1/200s | 1/125s | 1/125s |
| P-TTL Flash | Yes | Yes | Yes |
| TTL Flash | No | No | No |
| Flash Exposure Comp | -2 to 1 EV | -2 to 1 EV | -2 to 1 EV |
| Flash Functions | Auto discharge*, On (leading curtain sync)*, Redeye reduction*, Slow-speed sync*, Trailing curtain sync*, High-speed sync*, Manual*, Wireless**, Contrast control**
* Requires an external flash
** Requires two (or more) external flashes | On (leading curtain sync)*, Redeye reduction*, Slow-speed sync*, Trailing curtain sync*, High-speed sync*, Manual*, Wireless**, Contrast control**
* Requires an external flash
** Requires two (or more) external flashes | On (leading curtain sync)*, Redeye reduction*, Slow-speed sync*, Trailing curtain sync*, High-speed sync*, Manual*, Wireless**, Contrast control**
* Requires an external flash
** Requires two (or more) external flashes |
| Weather Resistant | Yes | Yes | Yes |
| GPS | Built-In | Via Accessory | Via Accessory |
| Control Wheels | 3 | 2 | 2 |
| Camera Controls | 2 traditional e-dials and 1 settings dial/control wheel. Many dedicated buttons. Customizable control panel. Five user mode settings. Customizable Fx1 & Fx2 button. | 2 control wheels Many dedicated buttons Control panel Three user mode settings | 2 control wheels Many dedicated buttons Control panel Three user mode settings |
| Dust Removal | Yes, Ultrasonic DR II | Yes, Ultrasonic DR II | Yes, Ultrasonic DR II |
| Dust Alert | No | Yes | Yes |
| File Format | PEF (RAW),DNG (RAW),JPG,MOV | PEF (RAW),DNG (RAW),JPG,TIFF,MOV | PEF (RAW),DNG (RAW),JPG |
| Card Slots | 2 | 2 | 2 |
| Memory Card Type | SD, SDHC, SDXC (UHS-I Compatible) | SD, SDHC, SDXC (UHS-I Compatible), Eye-Fi, Flucard | SD, SDHC, SDXC with firmware 1.01 and higher |
| Tethering | Wired (native),Via built-in Wi-Fi | Wired (native),Via O-FC1 FLUcard | Wired (native) |
| Battery | D-LI90 Rechargeable | D-LI90 lithium-ion rechargeable | D-LI90 lithium-ion rechargeable |
| Battery Grip | D-BG6 (takes D-LI90 or 6x AA)
|
No
|
No
|
| Battery Life | 670 images, playback time: 340 minutes | 650 images | 800 images |
| Size (W X H X D) | 136.5 x 110.0 x 85.5 mm | 156mm x 117mm x 123mm | 156mm x 117mm x 119mm |
| Weight | 925g (1010 with battery and SD cards) | 1550 g | 1400 g (1480 g with battery and two SD cards) |
| Connectivity | USB 2, HDMI out, stereo mic, headphones, DC in, X-sync, cable release, GPS, Wi-Fi. | USB3, HDMI out, X-Sync, head phones, microphone, cable release, DC in | USB2, HDMI, AV out, X-Sync, cable release, DC in |
| Latest Firmware | Link to download page | Link to Download Page | Version 1.33 |
| Notes | Astrotracer functionality with the built in GPS,
Buttons, top LCD, and card and connectivity doors can be illuminated
Electronic level,
Embed copyright information in EXIF,
GPS and electronic compass,
High ISO NR, can be customized for each major ISO value,
Image plane indicator,
In-camera RAW development,
Moiré suppression via SR mechanism,
Moiré suppression bracketing,
Save last JPG as RAW,
Save JPG from movie,
Several buttons are customizable,
The function selector plus third control wheel provides a short cut to a variety of settings | Electronic level,
Embed copyright information in EXIF,
High ISO NR can be customized for each major ISO value,
Image plane indicator,
In-camera RAW development,
Save last JPG as RAW,
Save JPG from movie,
The RAW button is customizable | Electronic level,
Embed copyright information in EXIF,
Image plane indicator,
In-camera RAW development |
| Colors / Special Editions |
Limited quantity silver version with matching grip (announced in August, 2020)
|
645Z IR
|
Red Lacquer, 645D IR
|
