will this camera use Canon lenses and still have excellent auto focus?

a7R3 with MC-11 adapter for Canon lenses "hunts" a LOT and for me was not acceptable except to use on manual for macro work. Thus, I expect the adapters will not work for the R4 either. You would not want to buy this great camera and then use Canon lenses. Besides the functionality questions, from a business perspective, Canon and Nikon are getting so far behind Sony and are way undercapitalized compared to Sony, I see their problem getting worse and Sony continuing to rapidly gain market share. The value of my Canon lenses dropped dramatically in the time it took me to bite the bullet and sell all my Canon equipment.

What do you recommend for memory cards for this camera???

the camera has two UHS-II slots. however, it has a limit to how fast it can write video of 100mps. Sony Tough-G cards are among the fastest. I use one in Slot 1, configured for photos, with a Sony Tough-G series card for video. For backup cards, which you'll need for large file sizes, i use Lexar Professional 1667x. Delkin Devices and Sandisk (Extreme Pro) also make fast cards. Again, for video, you dont need a card faster than 100mps write speed. I'd recommend 128g or 256g cards. the benefit of using fast cards for stills is that the buffer will clear faster in burst shooting at 10fps. There are cards out there as fast or faster as the Tough series, but not as durable. if this doesnt matter to you you could go with regular sony G- or M-series, but the price differential isn't all that much for the Tough series.

Does this shoot in 4k 120fps?

Hi, this unit allows for movie recording in XAVC S 4K at 24 or 30p.

I am coming from an A7R are the upgrades substantial enough to justify dropping 3,500 dollars on a new body? I have all zeiss prime lenses .

Yes. I have had every A7 model camera and this is by far my favorite and it was worth the money for me.

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Description

📷 Elevate Your Vision with the Sony A7R Mark IV!

CINEMATIC MASTERY - Record breathtaking UHD 4K30p video with advanced HLG & S Log3 Gammas.
VERSATILE DYNAMIC - Perfect for both stills and video, making it a must-have for creators.
LIGHTNING FAST FOCUS - Experience precision with a 567 Point Phase Detection AF System.
UNLEASH YOUR CREATIVITY - Capture stunning images with a 61MP Full Frame Exmor R BSI CMOS Sensor.
PROFESSIONAL PERFORMANCE - Elevate your photography with the powerful BIONZ X Image Processor.

The Sony A7R Mark IV is a cutting-edge mirrorless camera featuring a 61MP Full Frame Exmor R BSI CMOS Sensor, advanced BIONZ X Image Processor, and a sophisticated 567 Point Phase Detection AF System, making it ideal for both high-resolution photography and professional-grade video recording.

Specifications

Metering Methods	Center-Weighted Average, Highlight Weighted, Multiple, Spot
Exposure Control	Manual
White Balance Settings	Auto, Cloudy, Color Temperature, Custom, Daylight, Flash torch, Fluorescent, Incandescent, Shade, Underwater
Self Timer	10 Seconds
Crop Mode	APS-C
Screen Size	3 Inches
Display Type	OLED
Dots Per Screen	106667
Display Fixture Type	Tilting
Touch Screen Type	Capacitive
Display Resolution Maximum	1,440,000 pixels
Has Color Screen	Yes
Flash Memory Type	SD
Memory Slots Available	1
Write Speed	Up to 300 MB/s
Flash Memory Speed Class	UHS-II
Flash Memory UHS Speed Class	3
Flash Memory Video Speed Class	UHS Speed Class 3 (U3)
Flash Memory Bus Interface Type	UHS-II
Compatible Mountings	Sony E
Sensor Type	CMOS
Image stabilization	Sensor-shift
Maximum Aperture	3.5 Millimeters
Expanded ISO Minimum	50
Photo Sensor Resolution	61 MP
Photo Sensor Size	Full Frame (35mm)
Maximum Shutter Speed	44569 Seconds
Minimum Shutter Speed	2227981 Seconds
Form Factor	Mirrorless
Special Feature	BIONZ X Image Processor and Front-End LSI; 567-Point Phase-Detection AF System; 5-Axis SteadyShot INSIDE Stabilization
Color	Black
Item Weight	1.3 Pounds
Video Resolution	4K UHD 2160p
Viewfinder	Electronic
Flash Modes	Auto, Fill Flash, Hi-Speed Sync, Off, Rear Sync, Red-Eye Reduction, Slow Sync, Wireless
Camera Flash	Hot Shoe, PC Terminal
Skill Level	Professional
Compatible Devices	Sony E mount camera lenses and other Sony accessories designed for the ILCE7RM4/B model or series
Continuous Shooting	1E+1 fps
Aperture modes	Automatic (A), Manual Focus (M), Single-Servo AF (S)
Viewfinder Magnification	0.78x
Audio Input	Microphone
Flash Sync Speed	1/250 Second
Video Capture Format	4k
Expanded ISO Maximum	51200
Battery Weight	3 Ounces
Delay between shots	0.1 seconds
Audio Output Type	Headphones
Battery Cell Type	Lithium Ion
Aspect Ratio	1:1, 3:2, 4:3
File Format	RAW
Effective Still Resolution	61 MP
JPEG Quality Level	Fine
Supported Image Format	JPEG, RAW
Maximum Image Size	61 MP
Bit Depth	14 Bit
Total Still Resolution	61 MP
Maximum Focal Length	35 Millimeters
Lens Type	Standard Zoom
Zoom	Digital Zoom
Camera Lens	Sony E-mount lens
Minimum Focal Length	35 Millimeters
Real Angle Of View	44 Degrees
Focal Length Description	70 millimeters
Digital Zoom	0.78 x
Number of Diaphragm Blades	9
Lens Construction	18 elements in 13 groups
Connectivity Technology	USB, Wi-Fi
Wireless Technology	Bluetooth, Wi-Fi
Video Output	Micro-HDMI
Total USB 2.0 Ports	1
Total USB 3.0 Ports	1
Total USB Ports	1
Total Video Out Ports	1
Shooting Modes	Bulb Mode,Aperture Priority, Manual, Program, Shutter Priority
Digital Scene Transition	false
Digital-Still	Yes
Movie Mode	Yes
Image Capture Type	Stills & Video
Night vision	No
Auto Focus Technology	Eye Detection
Focus Features	Automatic (A), Continuous-Servo AF (C), Direct Manual Focus (DMF), Manual Focus (M), Single-Servo AF (S)
Autofocus Points	425
Focus Type	Auto Focus
Focus Mode	Continuous-Servo AF (AF-C)
Autofocus	Yes

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