Camera
K-1 Mark II
What the Pentax K-1 Mark II Is and Where It Sits
The Pentax K-1 Mark II is a full-frame DSLR announced in February 2018, representing the flagship of Ricoh Imaging's K-Mount lineup. It arrived as a targeted refinement of the original K-1, upgrading the image processor and introducing an Accelerator Unit to improve high-ISO performance and continuous-shooting behavior without altering the sensor itself. Within the Pentax family it occupies the senior position above APS-C siblings like the K-3 Mark III and K-70, offering a larger imaging circle and greater low-light headroom for photographers who have invested in full-frame-capable K-Mount glass.
A 36-Megapixel Sensor Built for Detail and Dynamic Range
The K-1 Mark II pairs a 35.9 x 24.0 mm primary-color CMOS sensor with approximately 36.40 effective megapixels, a figure that places it in direct competition with other high-resolution full-frame bodies rather than speed-optimized models. At that pixel count, landscape and studio photographers gain meaningful room to crop, recompose, or produce large prints without a penalty to image quality. Reviewers consistently note that the PRIME IV processor with Accelerator Unit extracts cleaner files at elevated ISOs compared to its predecessor, particularly in the ISO 51200 and higher range.
ISO Range and Low-Light Latitude
The native ISO range runs from ISO 100 through ISO 819200, an extremely wide expansion that extends well into territory most photographers will treat as an emergency reserve rather than a working value. Consensus indicates that usable image quality holds up strongly through roughly ISO 6400, with acceptable noise character extending to ISO 25600 for photographers comfortable with luminance noise that responds well to noise reduction. The Accelerator Unit, paired with the PRIME IV engine, processes noise reduction in a way that preserves fine texture better than earlier PRIME generations, according to users who have compared both bodies directly.
Shake Reduction II: Five Axes Inside the Body
One of the K-1 Mark II's most practical advantages is its 5-axis sensor-shift Shake Reduction II (SRII) system, which operates entirely in the camera body. Because stabilization lives in the sensor rather than the lens, every K-Mount lens benefits, including vintage K-Mount and M42 glass adapted to the system. Users report meaningful gains in handheld shooting at long exposures, particularly in astrophotography and low-light interiors where a tripod is not always practical.
GPS, Astrotracer, and Connectivity
The K-1 Mark II includes integrated GPS with support for GPS, QZSS, SBAS (WAAS, EGNOS, GAGAN, and MSAS), embedding location coordinates directly in image EXIF data and powering the Astrotracer function, which compensates for Earth's rotation during long exposures to keep stars pinpoint-sharp. Wi-Fi connectivity conforms to IEEE 802.11b/g/n, enabling remote control and image transfer to a mobile device. The body also provides an HDMI Type D output for external monitoring and dual SD/SDHC/SDXC card slots for redundant storage or sequential overflow capture.
Autofocus System: SAFOX 12 at a Glance
The SAFOX 12 phase-detection autofocus system provides 33 AF points, of which 25 are cross-type and clustered in the central region of the frame. The AF system operates across a brightness range of EV -3 to 18 at ISO 100, which supports focusing in moderately dark environments. Reviewers note that the SAFOX 12 is reliable for stationary and slow-moving subjects, but the relatively modest point count and central clustering mean it is better suited to deliberate composition than to tracking erratic athletic action.
Continuous Shooting Speed and Buffer
Full-frame continuous shooting reaches approximately 4.4 fps in High mode. Switching to APS-C crop mode raises that ceiling to approximately 6.4 fps, which can be useful for wildlife photographers who want more reach and a modest speed boost simultaneously. At 4.4 fps the K-1 Mark II is not a sports-first body, but the combination of 36-megapixel resolution and stable SAFOX 12 tracking makes it capable for wildlife work where subjects move predictably and the priority is image quality over burst depth.
Viewfinder and Display
The optical pentaprism viewfinder delivers approximately 100% frame coverage at approximately 0.70x magnification, giving a bright, full view of the scene without the slight lag or resolution ceiling of an electronic viewfinder. The rear LCD measures 3.2 inches in a 3:2 aspect ratio with approximately 1,037,000 dots and incorporates a flexible tilt mechanism. Reviewers observe that the air-gapless glass panel reduces internal reflections and improves outdoor legibility compared to conventional air-gap designs.
| Spec | A | B |
|---|---|---|
| Sensor Type | Primary color filter, CMOS | — |
| Sensor Size | 35.9 x 24.0 mm (full frame) | — |
| Effective Megapixels | Approx. 36.40 megapixels | — |
| Image Processor | PRIME IV with Accelerator Unit | — |
| ISO Range | ISO AUTO / 100-819200 | — |
| In-Body Stabilization | 5-axis sensor-shift Shake Reduction II (SRII) | — |
| AF System | SAFOX 12, TTL phase-matching autofocus | — |
| AF Points | 33 points (25 cross-type in center) | — |
| AF Brightness Range | EV -3 to 18 (ISO 100) | — |
| Continuous Shooting (Full Frame) | Approx. 4.4 fps (H mode) | — |
| Continuous Shooting (APS-C Crop) | Approx. 6.4 fps | — |
| Shutter Speed | 1/8000-30 sec (Auto and Manual) | — |
| Viewfinder | Pentaprism optical, approx. 100% coverage, approx. 0.70x magnification | — |
| Rear LCD | 3.2 inch, approx. 1,037,000 dots, flexible tilt | — |
| Video | Full HD 1920x1080 at 60i / 50i / 30p / 25p / 24p | — |
| GPS | GPS, QZSS, SBAS (WAAS / EGNOS / GAGAN / MSAS) | — |
| Wi-Fi | IEEE 802.11b/g/n | — |
| Card Slots | Dual SD / SDHC / SDXC slots | — |
| Battery Life (CIPA) | Approx. 670 shots per charge | — |
| Dimensions (W x H x D) | Approx. 136.5 x 110 x 85.5 mm | — |
| Weight (with battery and card) | Approx. 1,010 g | — |
Video Capability: Full HD with Caveats
Video capability is limited to Full HD at 1920x1080, with frame-rate options of 60i, 50i, 30p, 25p, and 24p recorded in MPEG-4 AVC/H.264 MOV format. The K-1 Mark II does not offer 4K recording, which is a significant limitation against mirrorless contemporaries that had begun offering 4K by 2017. Photographers who shoot video seriously should treat this as a still-first body with adequate video capability for occasional social or documentary clips, not as a primary video tool.
Build, Ergonomics, and Weather Resistance
The camera body measures approximately 136.5 x 110 x 85.5 mm and weighs approximately 1,010 g with battery and card, placing it in the heavier end of full-frame DSLRs. Pentax builds the K-1 Mark II with extensive weather sealing for dust and splash protection, and the body is rated for operation in challenging low-temperature environments, appealing to outdoor photographers who work in demanding conditions year-round. The physical shutter spans 1/8000 second to 30 seconds in both Auto and Manual modes.
Battery Life and Field Endurance
The D-LI90P lithium-ion battery delivers approximately 670 shots per charge under CIPA test conditions, which places it firmly in the working-DSLR category for day-long shoots without a spare. Photographers heading into the field for extended expeditions will want at least one additional battery, particularly when GPS tagging is active, as GPS acquisition draws continuously and reduces real-world endurance below the CIPA figure. Cold-temperature operation further reduces effective capacity, a practical consideration for winter landscape and astrophotography sessions.
The Ideal User for This Camera
The K-1 Mark II rewards photographers whose priorities are high-resolution still image quality, in-body stabilization, and body-integrated GPS, and who already own or plan to invest in the K-Mount lens ecosystem. It is especially well suited to landscape, astrophotography, and travel photographers who value the Astrotracer function and weather sealing, and who are comfortable with the deliberate, methodical approach that a 36-megapixel DSLR encourages. Photographers who depend on 4K video, mirrorless-caliber subject tracking, or a compact form factor will find the K-1 Mark II a less natural fit for their workflow.
Honest Limitations to Weigh
The SAFOX 12 AF system, while capable at EV -3, uses only 33 points with central cross-type coverage, trailing the broader subject-tracking and eye-detection capabilities of mirrorless systems released after 2020. The 4.4 fps full-frame burst rate and absence of 4K video are tangible constraints relative to contemporaries. USB 2.0 (Micro-B) for tethering and transfer is noticeably slow by current standards, and reviewers note that large raw files from the 36-megapixel sensor can make tethered workflows with the stock connection feel sluggish compared to USB 3.0 or USB-C alternatives available on newer bodies.
Value and Market Positioning
As a 2018 model, the K-1 Mark II now occupies a value-oriented position in the used and refurbished market, offering flagship-era full-frame resolution at a fraction of its original retail price. The official Ricoh Imaging product page confirms the full specification set and provides firmware update history that addresses minor AF and exposure behaviors since launch. For K-Mount lens owners, acquiring the K-1 Mark II at current secondhand prices represents a cost-efficient route to full-frame files without migrating to a new lens system.
Frequently Asked Questions
- Is the Pentax K-1 Mark II good for astrophotography?
Consensus across astrophotography communities indicates the K-1 Mark II is one of the better DSLRs for night-sky work. The combination of a 36.40-megapixel full-frame sensor, 5-axis Shake Reduction II, and the built-in GPS Astrotracer function, which compensates for Earth's rotation during long exposures, makes it a distinctive choice. The wide ISO range up to ISO 819200 provides headroom for very dark skies, and the weather sealing supports cold-night use in demanding outdoor environments.
- Does the Pentax K-1 Mark II shoot 4K video?
No. The K-1 Mark II is limited to Full HD 1920x1080 video at frame rates of 60i, 50i, 30p, 25p, and 24p, recorded in MPEG-4 AVC/H.264 MOV format. Photographers who require 4K capture will need to consider a different body, as Ricoh did not add 4K capability at this generation. The K-1 Mark II is primarily a still-photography platform and video is a secondary capability.
- How does the Pentax K-1 Mark II differ from the original K-1?
The sensor resolution of approximately 36.40 megapixels is unchanged between the K-1 and K-1 Mark II. The key differences are the updated PRIME IV processor paired with a new Accelerator Unit, which Ricoh introduced to improve high-ISO noise handling and to enable the Handheld Pixel Shift Resolution mode. Reviewers who tested both bodies found the Mark II produces cleaner files at elevated ISOs, though the optical and mechanical specifications, including the SAFOX 12 AF system, viewfinder, and SRII stabilization, remain consistent across both generations.
- What lenses are compatible with the Pentax K-1 Mark II?
The K-1 Mark II uses the PENTAX KAF2 bayonet mount, which maintains backward compatibility with a wide range of K-Mount lenses. Modern DA, DFA, FA, and D FA lenses designed for full-frame coverage work without crop mode. Older K-Mount and M42 lenses can be adapted, and they benefit from the in-body SRII stabilization because stabilization is sensor-based rather than lens-based. The K-1 Mark II does not natively support autofocus with manual-focus legacy lenses.
- How is the autofocus performance of the Pentax K-1 Mark II for sports and wildlife?
The SAFOX 12 system provides 33 AF points, 25 of which are cross-type and concentrated in the center of the frame, and operates from EV -3 to EV 18 at ISO 100. Reviewers characterize it as reliable for stationary or predictably moving subjects, but note that the central clustering and absence of eye-detection or deep-learning subject tracking put it at a disadvantage compared to current mirrorless systems for erratic or fast-moving action. Wildlife photographers working with predictable animal movement and a methodical approach report satisfactory results.
- What is the battery life on the Pentax K-1 Mark II?
Under CIPA test conditions, the D-LI90P battery provides approximately 670 shots per charge. Real-world battery life varies with GPS usage, continuous shooting behavior, and live-view frequency. Users who activate GPS tagging for geotagging and Astrotracer work report meaningfully shorter real-world endurance because the GPS module draws continuously. Carrying a second D-LI90P battery is a common recommendation for full-day field sessions, particularly in cold weather where lithium-ion capacity decreases.