Panasonic is finally ready to spill all the beans on its S1 and S1R full-frame mirrorless cameras.

As previously noted, the LUMIX S1R and S1 will use the Leica L lens mount and feature in-body 5-axis image stabilization good for 5.5 stops of shake reduction. When paired with select Panasonic lenses that support Dual I.S., shake reduction jumps to 6 stops.

Don’t Miss: What Photographers Need to Know About the L-Mount Alliance

Both cameras will incorporate a very high-resolution OLED EVF with 5,760K dots and a top refresh rate of 120fps. Its 0.78x magnification can be switched to 0.7x or 0.74x depending on your needs. You’ll also find a triaxial tilting touch display with a Live View Boost mode which increases the sensitivity of the on-screen preview (but not the image itself) when shooting in low light.

The AF system on both cameras uses contrast detection and Panasonic’s Depth from Defocus technology to achieve AF acquisition in as little as .08 seconds. The AF system has been enhanced with the use of an AI-derived algorithm to improve object recognition and object tracking, even when a subject turns its back. According to Panasonic, its face and eye-tracking has been improved so that the cameras can locate and focus on the pupil of the eye.

The cameras can burst at 6fps with AF/AE tracking or at 9fps with focus fixed on the first frame. Both are capable of focusing down to -6EV. As in similar Panasonic models, there are 6K and 4K Photo Modes to take one-second bursts of video and extract a still image (18-megapixels for 6K and 8-megapixels for 4K). The burst rate for 6K Photo is 30fps, while 4K Photo will fire off at 60fps.

Both models will incorporate a new Hybrid Log Gamma (HLG) photo mode for capturing images with high dynamic range. When shooting in HLG mode with the S1R, you’ll capture 8K-resolution images while the S1 can capture HLG images at full resolution. The mode creates a brand new photo file format (.HSP) which can’t be read by any computers just yet but can be displayed on Panasonic TVs and other HLG-compliant devices when the camera is connected via HDMI.

In addition to the standard aspect ratios, the new cameras will also be able to shoot in 65:24 or a 2:1 aspect ratio. RAW files are captured at full size.

On the design front, both models incorporate joystick for selecting AF points and are weather-sealed with shutters rated for 400,000 cycles. They have dual memory card slots for SD and XQD memory (CFExpress compatibility is due in the future). The cameras offer USB-C ports that can recharge the S1/S1R’s battery while it’s still in the camera body. There’s Bluetooth and Wi-Fi for remote control and image transfers to mobile devices.

Additional shared features of the S1/S1R
* Full HD recording up to 180 fps
* A lockable HDMI port
* Headphone and mic ports
* HEVC video encoding
* Weighs 2.25 pounds with battery and memory card
* New flat picture profile for JPEGs

Lumix S1R

The Lumix S1R features a 47.3-megapixel full-frame CMOS sensor with no low-pass filter. It has a native ISO range of 100-25,600 (expandable to 50-51,200). A High Resolution mode, which uses the internal sensor-shifting mechanism to compile a series of eight images and merge them into a single file, can create the equivalent of a 187-megapixel ultra-high precision photo shooting.

On the video front, the S1R can record 4K/60p video (8-bit, 4:2:0) internally but will have a crop.

Additional features include:
* 360 shot battery life, per CIPA, when shooting with XQD memory or 380 when using SD cards
* can store 40 RAW frames, 35 RAW+JPEG or 50-plus JPEGs in burst shooting

The S1R will retail for $3,699 (body only).

Lumix S1
The Lumix S1 incorporates a 24.2-megapixel CMOS sensor and will be the more capable of the two cameras when it comes to video recording. First, it can record 4K/60p (8-bit, 4:2:0) but with no crop and full pixel readout.

A future firmware update (which will require buying a software license) will enable you to record 4k/30p at 10-bit 4:2:2 internally and 4k/60p externally with V-Log. This firmware is expected later in the year.

Additional features include:
* High Resolution mode to produce a 98-megapixel equivalent image
* native ISO range of 100-51,200 (50-204,800, expandable)
* records 90 RAW frames, 70 RAW+JPEG or over 1,000 JPEGs in burst with XQD memory
* 380 image battery life, per CIPA, when using XQD memory or 400 when using SD cards

The S1 will retail for $2,499 (body).