Sony a7R IV vs Sony a77

This is a full comparison between the cameras Sony a7R IV and Sony a77. We compare them by looking at the categories you see below.

Manufacturing

These cameras are both manufactured by Sony.

Sony a7R IV were released 2019 and Sony a77 was released 2011. That is a 8 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera Released
Sony a7R IV 2019
Sony a77 2011

Type of camera

Sensors / crop factor

These cameras have different sensors. Sony a7R IV has a "Sony Full Frame"-sensor while Sony a77 has a "Sony APS-C"-sensor, and their difference in sensors will also affect the crop factor and experience focal length. See the table below.

Camera Focal length, 50mm f/1.8 **
Sony a7R IV 50 mm
Full-frame sensor
No crop factor/focal length multiplier
Sony a77 75 mm
Sony APS-C sensor
Crop factor/focal length multiplier by * 1.5

** Experienced focal length when using a lens such as a common "50mm f/1.8"

Learn more about crop factor and focal length multiplier here:
Camera selection can affect the focal length (Sony)

Resolution

Sony a7R IV has a 61 MP (Megapixels) resolution while Sony a77 has 24 MP. If we break down this in more detail this is the data behind the numbers:

Camera Megapixels
Sony a7R IV 61 MP
60217344 pixels
9504 x 6336
Sony a77 24 MP
24000000 pixels
6000 x 4000

Sony a7R IV has a 151 % larger resolution than Sony a77. This could give you more details in the picture but also a possibility to crop more in the pictures, afterward while editing the pictures, if needed that is.

ISO range

Sony a7R IV has a larger ISO-range than Sony a77. Sony a7R IV has an ISO range that stretches from 100 to 32000 while Sony a77 has 100 to 16000.

Camera ISO Range
Sony a7R IV 100-32000
Sony a77 100-16000

Autofocus and lens compatibility

Both of these cameras have a built-in autofocus motor. Some lenses, that support autofocus, do not have an autofocus motor of their own but this won't cause any problems with these two cameras.

Here is a complete overview of which lenses work with each camera:
Lens compatibility chart for Sony a7R IV
Lens compatibility chart for Sony a77

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Sony a7R IV can shoot up to 10 pictures per seconds and Sony a77 can shoot up to 12 pictures per seconds.

Camera FPS (Frames per second)
Sony a7R IV 10
Sony a77 12

Ability to record movies

It is becoming more and more popular to record movies with digital cameras.

In this case, both Sony a7R IV and Sony a77 can shoot movies.

Weight

The weight of the camera can be an extremely important factor, especially if the camera is about to be used, or carried around, for several hours at a time.

Sony a77 weighs 732 gr (equal to 1.61 lb) which is 10% heavier than Sony a7R IV and its 665 gr (or 1.47 lb).

Camera Weight
Sony a7R IV 665 gr
1.47 lb
Sony a77 732 gr
1.61 lb

Sony a7R IV vs Sony a77 Specs

Below you will find the complete and detailed technical specs for both Sony a7R IV and Sony a77, next to each other. Each category of data is a link to an article covering the subject, giving you a deeper understanding so you can better understand the strengths and weaknesses of the two camera models.

Product
Sony a7R IV
Sony a77
Name Sony a7R IV Sony a77
Manufacturer Sony Sony
Release Date and Price
Sony a7R IV
Sony a77
Release Year 2019 2011
Release Date 2019-07-16 2011-08-24
MSRP 3499 USD 1399 USD
Buy it today
Camera Type
Sony a7R IV
Sony a77
Camera Type Mirrorless SLT
Sensor
Sony a7R IV
Sony a77
Sensor Size Full Frame (approx 36 x 24 mm) APS-C (approx 23.5 x 15.6 mm)
Sensor Type BSI-CMOS CMOS
Resolution 9504 x 6336 pixels 6000 x 4000 pixels
Megapixels 61 MP 24 MP
Image Processor Bionz X Bionz
Image
Sony a7R IV
Sony a77
ISO Range 100 - 32000 100 - 16000
White Balance Presets 9 8
Custom White Balance Yes Yes
Image Stabilization Yes
(Sensor-Shift)
Yes
(Sensor-Shift)
Image Stabilization CIPA Rating 5.5 stops 0 stops
Uncompressed format RAW RAW
Optics & Focus
Sony a7R IV
Sony a77
Autofocus Motor Yes Yes
Autofocus Contract Detect (sensor)
Phase Detect
Multi Area
Center
Selective Single Point
Tracking
Single
Continuous
Touch
Face Detection
LiveView
Phase Detect
Multi Area
Selective Single Point
Single
Continuous
Face Detection
LiveView
Focus Points 567 19
Lens Mount Sony E

See Compatible Lenses
Sony A

See Compatible Lenses
Focal Length Multiplier Full frame
No multiplier
Example:
24 mm remains 24 mm
50 mm remains 50 mm
100 mm remains 100 mm
200 mm remains 200 mm
APS-C Sensor (1.5x)
1.5x multiplier
Example:
24 mm becomes 36 mm
50 mm becomes 75 mm
100 mm becomes 150 mm
200 mm becomes 300 mm
Screen & Viewfinder
Sony a7R IV
Sony a77
Articulated LCD Tilting Fully articulated
Screen size 3” 3”
Screen dots 1440000 921000
Touch screen Yes No
Screen type TFT LCD N/A
Live view Yes Yes
Viewfinder Type Electronic Electronic
Viewfinder Coverage 100% 100%
Viewfinder Magnification 0.78x 1.1× (0.73× 35mm equiv.)
Viewfinder Resolution 5760000 N/A
Photography features
Sony a7R IV
Sony a77
Frames per second 10 fps 12 fps
Minimum Shutter Speed 30 seconds 30 seconds
Maximum Shutter Speed 1/8000 seconds 1/8000 seconds
Built-in Flash No Yes
Built-in Flash Range N/A 12 meters
External Flash Yes Yes
Self-Timer Yes Yes
Time-lapse Yes No
Metering modes Multi
Center Weighted
Highlight Weighted
Spot
Average
Multi
Center Weighted
Spot
Exposure Compensation +/- 5 (at 1/3 EV, 1/2 EV steps) +/- 5 (at 1/3 EV, 1/2 EV steps)
Videography features
Sony a7R IV
Sony a77
Video recording Yes Yes
Video format MPEG4
H.264
XAVC-S
MPEG4
H.264
AVCHD
Video resolution 1920 x 1080
3840 x 2160
1440 x 1080
1920 x 1080
Built-in Microphone Yes Yes
Built-in Speakers Yes Yes
Storage
Sony a7R IV
Sony a77
Memory Card SD/SDHC
Memory Stick Pro Duo
SD/SDHC
Connectivity
Sony a7R IV
Sony a77
HDMI Output Yes Yes
Microphone Port Yes No
Headphone Port Yes No
Wireless Yes
Built-in (802.11ac + Bluetooth 4.1 + NFC)
Yes
Eye-Fi Connected
Remote Control Yes (via smartphone) Yes (Optional)
GPS No Yes
Built-in
Body & Dimensions
Sony a7R IV
Sony a77
Enviromentally sealed Yes Yes
Battery Battery Pack Battery Pack
Battery Details NP-FZ100 lithium-ion battery & charger
Rechargeable NP-FM500H battery & charger
Battery Life (CIPA) 670 shots 470 shots
Width 129 mm 143 mm
Height 96 mm 104 mm
Depth 78 mm 81 mm
Weight 665 gram 732 gram