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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Specifications

ASIN	B07VGHW91J
Age Range Description	Adult
Aperture modes	Automatic (A), Manual Focus (M), Single-Servo AF (S)
Are Batteries Included	Yes
Aspect Ratio	1:1, 3:2, 4:3
Aspect ratio	1:1, 3:2, 4:3
Auto Focus Technology	Hybrid
Autofocus	Yes
Autofocus Points	425
Best Sellers Rank	#76,347 in Electronics ( See Top 100 in Electronics ) #136 in Mirrorless Cameras
Bit Depth	14 Bit
Brand	Sony
Built-In Media	Camera Body Only
Camera Flash	Built-In
Camera Lens	Sony E-mount lens
Color	Black
Compatible Devices	Sony E mount camera lenses and other Sony accessories designed for the ILCE7RM4/B model or series
Compatible Mountings	Sony E
Compatible mountings	Sony E
Connectivity Technology	Bluetooth, Wi-Fi
Continuous Shooting	10 FPS
Crop Mode	APS-C
Customer Reviews	4.6 out of 5 stars 239 Reviews
Digital Scene Transition	false
Digital Zoom	0.78 x
Digital-Still	Yes
Display Fixture Type	Tilting
Display Resolution Maximum	9550 Pixels
Display Type	LCD
Dots Per Screen	30 dots per square inch
Effective Still Resolution	61 MP
Expanded ISO Minimum	100
Exposure Control	Shutter Priority, Manual
File Format	JPEG, ARW, MP4
Flash Memory Bus Interface Type	UHS-II
Flash Memory Speed Class	UHS-II
Flash Memory Type	SD
Flash Memory UHS Speed Class	3
Flash Memory Video Speed Class	UHS Speed Class 3 (U3)
Flash Modes	[Fill Flash, Auto]
Flash Sync Speed	1/250 Second
Focus Features	Phase Detection Autofocus
Focus Mode	Continuous-Servo AF (AF-C)
Focus Type	Auto Focus
Form Factor	Mirrorless
Global Trade Identification Number	00027242918986
Hardware Interface	AV Port
Has Color Screen	Yes
Image Capture Type	Stills & Video
Image stabilisation	Optical
Image stabilization	Optical
Item Weight	578 g
JPEG Quality Level	Fine
Lens Construction	18 elements in 13 groups
Lens Type	Standard Zoom
Manufacturer	Sony
Maximum Aperture	3.5 Millimeters
Maximum Focal Length	35 Millimeters
Maximum Image Size	61 MP
Maximum Shutter Speed	44569 Seconds
Maximum focal length	35 Millimeters
Memory Slots Available	1
Metering Methods	Evaluative
Minimum Focal Length	35 Millimeters
Minimum Shutter Speed	2227981 Seconds
Model Name	A7R Mark IV
Model Number	ILCE7RM4/B
Model Series	Alpha 7R
Movie Mode	Yes
Night vision	No
Number of Diaphragm Blades	9
Photo Sensor Resolution	61 MP
Photo Sensor Size	Full Frame (35mm)
Photo sensor technology	BSI CMOS
Real Angle Of View	44 Degrees
Remote Included	No
Screen Size	3 Inches
Self Timer	10 Seconds
Sensor Type	BSI CMOS
Series Number	7
Shooting Modes	Continuous Shooting, Landscape, Manual, Night, Portrait
Skill Level	Professional
Special Feature	Built-in Wi-Fi, Bluetooth
Specific Uses For Product	Photography, Videography
Supported Image Format	JPEG, RAW
Supported file format	JPEG, ARW, MP4
Total Still Resolution	61 MP
Total USB 2.0 Ports	1
Total USB 3.0 Ports	1
Total USB Ports	1
Total Video Out Ports	1
Touch Screen Type	Capacitive
UPC	027242918986
Video Output	Micro-HDMI
Video Resolution	2160p
Viewfinder	Electronic
Viewfinder Magnification	1.0x
Warranty Description	1 year manufacturer
White Balance Settings	Auto
Wireless Technology	Wi-Fi
Write Speed	Up to 300 MB/s
Zoom	Digital Zoom

Sony A7R Mark IV Body, Black

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