Sony a99 vs Sony a77

This is a full comparison between the cameras Sony a99 and Sony a77. We compare them by looking at the categories you see below.

Manufacturing

These cameras are both manufactured by Sony.

Type of camera

Sensors / crop factor

These cameras have different sensors. Sony a99 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.

** 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

Both these cameras have the exact same resolution. Sony a99 has a 24 MP (Megapixels) resolution while Sony a77 has 24 MP. If we break down this in more detail this is the data behind the numbers:

ISO range

Sony a99 has a larger ISO-range than Sony a77. Sony a99 has an ISO range that stretches from 100 to 25600 while Sony a77 has 100 to 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 a99
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 a99 can shoot up to 6 pictures per seconds and Sony a77 can shoot up to 12 pictures per seconds.

Ability to record movies

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

In this case, both Sony a99 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 a99 weighs 812 gr (equal to 1.79 lb) which is 11% heavier than Sony a77 and its 732 gr (or 1.61 lb).

Sony a99 vs Sony a77 Specs

Below you will find the complete and detailed technical specs for both Sony a99 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 a99	Sony a77
Name	Sony a99	Sony a77
Manufacturer	Sony	Sony
Release Date and Price	Sony a99	Sony a77
Release Year	2012	2011
Release Date	2012-09-12	2011-08-24
MSRP	2799 USD	1399 USD
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Camera Type	Sony a99	Sony a77
Camera Type	SLT	SLT
Sensor	Sony a99	Sony a77
Sensor Size	Full Frame (approx 36 x 24 mm)	APS-C (approx 23.5 x 15.6 mm)
Sensor Type	CMOS	CMOS
Resolution	6000 x 4000 pixels	6000 x 4000 pixels
Megapixels	24 MP	24 MP
Image Processor	Bionz	Bionz
Image	Sony a99	Sony a77
ISO Range	100 - 25600	100 - 16000
White Balance Presets	8	8
Custom White Balance	Yes	Yes
Image Stabilization	Yes (Sensor-Shift)	Yes (Sensor-Shift)
Image Stabilization CIPA Rating	0 stops	0 stops
Uncompressed format	RAW	RAW
Optics & Focus	Sony a99	Sony a77
Autofocus Motor	Yes	Yes
Autofocus	Phase Detect Multi Area Selective Single Point Tracking Single Continuous Face Detection LiveView	Phase Detect Multi Area Selective Single Point Single Continuous Face Detection LiveView
Focus Points	19	19
Lens Mount	Sony A 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 a99	Sony a77
Articulated LCD	Fully articulated	Fully articulated
Screen size	3”	3”
Screen dots	1229000	921000
Touch screen	No	No
Screen type	TFT Xtra Fine color LCD	N/A
Live view	Yes	Yes
Viewfinder Type	Electronic	Electronic
Viewfinder Coverage	100%	100%
Viewfinder Magnification	0.71×	1.1× (0.73× 35mm equiv.)
Viewfinder Resolution	N/A	N/A
Photography features	Sony a99	Sony a77
Frames per second	6 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	No	No
Metering modes	Multi Center Weighted Spot	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 a99	Sony a77
Video recording	Yes	Yes
Video format	MPEG4 H.264 AVCHD	MPEG4 H.264 AVCHD
Video resolution	1440 x 1080 1920 x 1080	1440 x 1080 1920 x 1080
Built-in Microphone	Yes	Yes
Built-in Speakers	Yes	Yes
Storage	Sony a99	Sony a77
Memory Card	Memory Stick Pro Duo SD/SDHC	Memory Stick Pro Duo SD/SDHC
Connectivity	Sony a99	Sony a77
HDMI Output	Yes	Yes
Microphone Port	No	No
Headphone Port	No	No
Wireless	No	Yes Eye-Fi Connected
Remote Control	Yes (Wired or Wireless (Optional))	Yes (Optional)
GPS	Yes Built-in	Yes Built-in
Body & Dimensions	Sony a99	Sony a77
Enviromentally sealed	Yes	Yes
Battery	Battery Pack	Battery Pack
Battery Details	Lithium-Ion NP-FM500H rechargeable battery & charger	Rechargeable NP-FM500H battery & charger
Battery Life (CIPA)	500 shots	470 shots
Width	147 mm	143 mm
Height	111 mm	104 mm
Depth	78 mm	81 mm
Weight	812 gram	732 gram