Panasonic’s S5II Bet Was PDAF, Then Three Years of Firmware

Panasonic launched the LUMIX S5II and S5IIX at CES on January 4, 2023, the first LUMIX cameras with phase detection autofocus. The S5II went on sale in January 2023 at $1,999.99. The S5IIX followed in May 2023 at $2,199.99.

That $200 gap bought RAW output, All-Intra, ProRes, and recording to a USB-C SSD. The deeper wager was the new 24.2-megapixel sensor and a Leica-shared engine Panasonic was still patching more than three years later.

Panasonic Put PDAF in a $1,999 Hybrid Pair

Panasonic called the pair the first LUMIX bodies with PDAF, built around a new 24.2-megapixel 35mm full-frame CMOS sensor and a new imaging engine. The engine came out of the L² Technology alliance with Leica, signed on May 31, 2022, and Panasonic said it offered about 2x faster signal processing for high bit-rate video.

Phase Hybrid Auto-Focus raised the count to 779 points. Panasonic said that once either camera locked on a subject, tracking would hold in poor light and when several objects moved in the frame. Continuous AF during zoom needed a lens firmware drop dated January 10, 2023. AF micro adjustment and smaller AF boxes shipped in the bodies.

Yosuke Yamane, then imaging-business director at Panasonic Entertainment & Communication, told a CP+ 2023 talk that the point of L² was a shared platform, not a logo on the hot shoe.

The main thing is the platform. It was developed together with Leica with the future in mind. One example is LUMIX’s new Phase Detection Autofocus (PDAF), which is implemented with a new engine developed in collaboration using L² Technology.

Yosuke Yamane, Executive Vice President, Panasonic Entertainment & Communication, CP+ 2023

Leica CEO Matthias Harsch had framed the same pact as joint work instead of splitting the market into smaller niches. Jesko von Oeynhausen, Leica’s global photo product director, said the two firms would jointly invest, jointly develop, and jointly market under the L² name, while each brand still shipped its own cameras.

A Fan, 779 Points and 6.5 Stops

The two cameras share the sensor, the engine, and the hybrid body. Panasonic combined 5-axis in-body stabilization with 2-axis optical stabilization in LUMIX S lenses for Dual I.S. 2, rated at 6.5 stops slower shutter speed on the CIPA test at 200mm with the S-E70200. Active I.S. for video was rated about 200% stronger than the system in the LUMIX S5, measured at 20mm with the S-R2060, by shifting how much the camera corrects horizontal, vertical, and rotational shake.

THE LAUNCH SPLIT

Both bodies record 4:2:0 10-bit 6K (3:2) and 5.9K (16:9), plus unlimited 4:2:2 10-bit C4K/4K when Thermal Management is not holding a 30-minute cap. High frame rate options include C4K/4K at 48p and Full HD at 120p, with Slow & Quick in C4K/4K from 1-60fps and Full HD from 1-180fps. V-Log/V-Gamut is rated at 14+ stops. Dual Native ISO runs to ISO 51200, extended to 204800.

Mechanical burst is 9fps in AFS and 7fps in AFC. The electronic shutter reaches 30fps in AFS and AFC for JPEG and RAW. A 96-megapixel High Resolution mode sits on the drive dial. The finder is a 3,680k-dot OLED at about 0.76x. The rear screen is a 3.0-inch free-angle panel at 1,840k dots. Dual UHS-II slots, full-size HDMI Type A, USB 3.2 Gen 2, Wi-Fi 5 GHz, and Bluetooth 5.0 round out the deck. The battery is the 2200mAh DMW-BLK22, shared with the S5 grip.

Panasonic put a small fan and a heat sink in the viewfinder hump so C4K 60p could run without a time cap at 0-40C. On STANDARD thermal management, 6K and 5.9K at 30p/25p still stop once a clip passes 30 minutes. The fan sits outside the sealed magnesium shell, which Panasonic rates splash-resistant and dust-resistant without promising a dunk.

Why LUMIX Held Out on Phase Detect

Until this pair, LUMIX mirrorless cameras focused with contrast detection and Depth From Defocus, a system that compared blur from two quick samples against a lens profile. On stills it could be fast. In video, especially on the original S5 from 2020 and on the S1H, the hunt showed up as a pulse in out-of-focus areas while the camera decided which way to rack.

That pulse became the reason a lot of hybrid buyers walked. Review videos live or die on talking-head AF, and DFD kept handing those videos a wobble. Panasonic had pushed DFD as far as the hardware would go. A new sensor with on-chip phase pixels was the only way to give the lens a distance reading instead of a blur guess.

Phase Hybrid AF did not throw DFD away. It uses phase detect to move the right way, then contrast to finish, and it can fall back when the scene is ugly. Testers found lock much more decisive in good light, with less of the old flutter, and still slower than older rivals in very dark, low-contrast rooms. The first PDAF LUMIX did not win a tracking contest with Sony or Canon. It made L-mount usable for run-and-gun video that the S5 could not trust.

The Extra $200 Buys SSD Recording and ProRes

The S5II already had the fan, the 6K open-gate modes, Real Time LUT from.VLT and.cube files, waveform, vector scope, zebra, 24.00Hz system frequency, and synchro scan. The X body is the same camera with a matte black shell and a video toolkit Panasonic left off the cheaper one.

S5IIX-ONLY VIDEO TOOLS

• SSD recording: The X body can write photos and video over USB-C to a retail drive up to 2TB, including Apple ProRes 422 HQ onto SSD at up to 1.9Gbps.
• All-Intra: 4:2:2 10-bit All-Intra records at up to 800Mbps on that same drive or on cards.
• HDMI RAW: 12-bit RAW at 5.9K, 4.1K, and 3.5K can feed an Atomos Ninja or a Blackmagic Video Assist 12G HDR for ProRes RAW or Blackmagic RAW.
• Live output: Wired and wireless IP streaming, plus USB tethering, ship on the X only.

Panasonic later sold the HDMI RAW path to S5II owners as the DMW-SFU2 software key, after a version 2.0 body update. SSD ProRes and All-Intra never moved over. If the $200 felt like a finish and a codec pack in May 2023, it was also a wall: the hybrid stills body could be upgraded for a recorder on the HDMI cable, but it would not become an SSD camera.

That split is why the X body kept showing up in cheap-kit arguments years later. Full-frame ProRes to a stick, without a recorder on the hot shoe, is still a short list, and the S5IIX was already on it at $2,199.99.

What Firmware Added After CES 2023

The CES note already promised RAW via SFU2, Live View Composite on the S5II, and more. Panasonic then treated the pair like a software product. Subject detection grew from people into animal eyes, cars, motorcycles, airplanes, and trains. Frame.io camera-to-cloud landed. LUMIX Lab and LUMIX Flow tied the bodies to phones. MP4 (Lite) trimmed open-gate files for social apps. Hybrid zoom and crop zoom arrived without a new lens. Proxy recording, extra E.I.S. strength, SH pre-burst, and a focus ring that can act as a control ring came in later drops.

HOW THE CES PAIR KEPT GETTING FEATURES

1. May 31, 2022: Leica and Panasonic sign the L² pact that will fund the S5II engine.
2. January 4, 2023: Panasonic unveils the S5II and S5IIX at CES in Las Vegas.
3. January 2023: The S5II goes on sale at $1,999.99.
4. May 2023: The S5IIX goes on sale at $2,199.99, and S5II owners get HDMI RAW through DMW-SFU2 after version 2.0.
5. May 13, 2025: Panasonic announces the LUMIX S1II and S1IIE, and says the S1IIE uses a 24.2MP sensor inspired by the S5II.
6. March 10, 2026: S5II version 3.7 firmware and S5IIX version 2.7 go live at 1:00am UTC, adding the DMW-DMS1 mic and LUMIX Flow 1.5.

The March 2026 drop, announced on February 25, 2026, is not a new AF system. It is a compatibility patch for a shotgun mic and a phone app, plus stability fixes, shipped beside updates for the S1RII, S1II, S1IIE, and S9. That is the tell. Panasonic did not orphan the CES pair when the S1II class arrived. It kept both trees alive, 3.7 on the S5II and 2.7 on the S5IIX, because the installed base was still shooting.

Used S5II bodies were still on Japanese shop lists on October 2, 2026, sold as PDAF hybrids with Real Time LUT. Fresh X-body buyers were still chasing ProRes and Blackmagic RAW. People who already owned one were asking when a true successor would land, which is another way of saying the 2023 pair had not been replaced in their bags.

The S1IIE Still Uses an S5II-Inspired Sensor

On May 13, 2025, Panasonic put the S1II at $3,199 and the S1IIE at $2,499, for late June sale. The S1II takes a partially stacked 24.1MP sensor and a faster burst. The S1IIE, Panasonic said, uses a 24.2MP sensor inspired by the S5II’s character, with open-gate 6K 30p and a new cropless Cinemascope 2.4:1 mode up to 60p. The cheaper 2025 hybrid is, in the company’s own wording, a descendant of the CES sensor bet, in a larger S1 shell.

That is a blunt scorecard for the 2023 wager. PDAF did not make LUMIX the tracking king. Low-light lock still trails the brands that had phase pixels for a decade. What the bet bought was a platform: one new sensor, one shared engine, two bodies $200 apart, a fan that made 4K a clip-until-the-card-fills job, and a firmware hose that was still open on March 10, 2026. The S1IIE then borrowed the S5II’s sensor idea instead of throwing it out.

L-mount shooters who bought the S5II in January 2023 paid $1,999.99 for the first LUMIX that could follow a face without pulsing the background. The ones who spent $2,199.99 in May got the same camera with a black paint job and a disk on the USB port. More than three years on, both serial numbers were still getting official files.

Frequently Asked Questions

What Is the Difference Between the S5II and S5IIX?

They share the 24.2-megapixel sensor, Phase Hybrid AF, Dual I.S. 2, the fan, and the 6K/4K codec set. The S5IIX adds ProRes, All-Intra, USB-C SSD recording, included HDMI RAW, IP streaming, USB tethering, and a matte black finish. The S5II can unlock HDMI RAW with the paid DMW-SFU2 key after firmware 2.0, but Panasonic never gave it SSD ProRes.

When Did Panasonic Add Phase Detection Autofocus to LUMIX?

The S5II and S5IIX, announced January 4, 2023, were the first LUMIX cameras with on-sensor PDAF. Phase Hybrid AF works with current L-Mount lenses and still mixes phase pixels with contrast detection, including DFD, and the camera can switch mix by scene instead of running phase detect alone.

Does the S5II Record Unlimited 4K Video?

Panasonic rates unlimited C4K 60p recording at 0-40C with the new heat sink and fan. 6K and 5.9K at 30p/25p still stop at 30 minutes when Thermal Management is set to STANDARD. On SDXC, MP4 4K files also split after 3 hours 4 minutes or 96GB, and MOV files split after 3 hours 4 minutes or 192GB, even if the camera is still cool.

What Is L² Technology on the S5II?

L² is the Leica and LUMIX trademark from the May 31, 2022 strategic pact, built on joint investment, joint development, and joint marketing rather than a Leica badge license. The S5II engine was the first product of that work. Yamane said engineers were already on near-weekly technical calls, with German staff visiting Japan, while each brand still set its own camera specs.

Can the S5II Record ProRes Directly to an SSD?

No. Internal ProRes and All-Intra to a USB-C SSD are S5IIX functions, with ProRes 422 HQ up to 1.9Gbps and All-Intra up to 800Mbps on drives up to 2TB. An S5II can send 12-bit RAW over HDMI at 5.9K, 4.1K, or 3.5K after the SFU2 key, but the file lands on an external recorder, not on a stick hanging off the USB port.