Sony Alpha SLT-A99 vs Sony Alpha SLT-A77 II

In this comparison, we will evaluate the Sony Alpha SLT-A99 and the Sony Alpha SLT-A77 II, highlighting the advantages of each over the other, discussing their pros and cons, shared strengths and weaknesses, and providing a rating based on their available features and specifications to assist you in choosing the one that best suits your needs.

Sony Alpha SLT-A99 was introduced in December 2012 and Sony Alpha SLT-A77 II was introduced in May 2014. Let us first list highlights of the models.

Now that we've looked at the most essential specifications and gained a basic understanding of these cameras, we can delve into more details and see the differences between them.

This section shows those features and specifications which are the reason to choose Sony Alpha SLT-A99 over Sony Alpha SLT-A77 II.

This section shows those features and specifications which are the reason to choose Sony Alpha SLT-A77 II over Sony Alpha SLT-A99.

We already listed pros and cons of each model. However, you may also find useful to look at their common strengths and weaknesses shown side-by-side.

Screen

Sony Alpha SLT-A99 and Sony Alpha SLT-A77 II have 3.0" Fully Articulated screens with 1,229k dot resolution. Fully articulated screen makes cameras selfie and vlogger friendly and generally very useful for video shooting.

Viewfinder

Cameras have built-in Electronic viewfinders with 2,359k dot resolution. They both have 100% coverage.

Sony Alpha SLT-A99 features a 24.3 megapixel Full Frame CMOS sensor with dimensions of 35.8 x 23.8 mm and a total area of 852 mm². Its native ISO range is 100 - 25,600. Sony Alpha SLT-A77 II features a 24.3 megapixel APS-C CMOS sensor with dimensions of 23.5 x 15.6 mm and a total area of 243.4 mm². Its native ISO range is 50 - 25,600.

Here is a sensor size comparison chart where you can see how different sensors compare with each other:

Sensor size chart

	Sensor	Dimensions	Area	Aspect Ratio	Crop Factor
	Medium Format	44 x 33 mm	1452 mm2	4:3	0.79x
	Full Frame	36 x 24 mm	864 mm2	3:2	1x
	APS-H	27 x 18 mm	486 mm2	3:2	1.3x
	APS-C	23.6 x 15.6 mm	368.2 mm2	3:2	1.5x
	APS-C (Canon)	22.3 x 14.9 mm	332.3 mm2	3:2	1.6x
	Micro Four Thirds	17.4 x 13 mm	226.2 mm2	4:3	2x
	1-inch	13.2 x 8.8 mm	116.2 mm2	3:2	2.7x
	1/1.7-inch	7.44 x 5.58 mm	41.5 mm2	4:3	4.7x
	1/2.3-inch	6.17 x 4.55 mm	28.1 mm2	4:3	5.6x

Sony Alpha SLT-A99 is equipped with BIONZ processor and can take pictures up to 6000 x 4000 resolution. It can also take pictures with lower resolution like 6000 x 3376, 3936 x 2624, 3936 x 2216, 2640 x 1760, 2640 x 1488 with 3:2, 16:9 aspect ratios. Sony Alpha SLT-A77 II is equipped with BIONZ X processor and can take pictures up to 6000 x 4000 resolution. It can also take pictures with lower resolution like 6000 x 3376, 4240 x 2832, 4440 x 2400, 3008 x 2000, x 3008 x 1688 with 3:2, 16:9 aspect ratios.

Lens Mount

Cameras have Sony A lens mount. Due to Full Frame sensor in Sony Alpha SLT-A99 its crop factor is equal to 1x, this means that a 35mm equivalent focal length of the mounted lens will be equal to its actual focal length. Due to APS-C sensor in Sony Alpha SLT-A77 II its crop factor is equal to 1.5x, this means that a 35mm equivalent focal length of the mounted lens will be equal to its actual focal length times 1.5.

In-Body Image Stabilization

The cameras have a built-in Sensor Shift in-body image stabilization (IBIS). This means that you are still getting vibration reduction when cameras are paired with non-image stabilizied lenses. It also works with lenses with optical image stabilization and in combination can achieve even better compensation.

Built-in GPS on Sony Alpha SLT-A99

Sony Alpha SLT-A99 has a built-in GPS (Global Positioning System) technology which allows you to automatically tag the location where you took your photos. You can later categorize, organize, and search for photos based on location. This is very useful for travel and outdoor photographers for documenting the locations where images were captured.
  Check out the cameras in our database that have built-in GPS.

Built-in Wi-Fi on Sony Alpha SLT-A77 II

Sony Alpha SLT-A77 II has a built-in Wi-Fi (802.11b/g/n, 2.4 GHz) which allows to easily transfer photos and videos from the camera to other Wi-Fi-enabled devices, such as smartphones, tablets, printers, or computers. This eliminates the need for cables and allows for quick and convenient media sharing and social media integration. It gives you the ability to control your camera remotely using a smartphone or tablet. This is particularly useful for taking self-portraits, group shots, or capturing images in challenging conditions without having to touch the camera. Firmware updates can also be downloaded and installed wirelessly.
  Check out the cameras in our database that have built-in WiFi.

NFC on Sony Alpha SLT-A77 II

Sony Alpha SLT-A77 II has Near Field Communication (NFC) technology which simplifies the process of pairing it with other NFC-enabled devices like smartphones or tablets. It allows to quickly transfer photos and videos or remotely control the camera from compatible device. NFC can also be used for authentication and security purposes. It can verify your identity before accessing certain features or transferring sensitive data. It can be used with NFC-enabled accessories as well, such as lenses, flashes and GPS devices.

USB Inputs and HDMI Outputs

Both models have USB 2.0 (480 Mbit/sec) inputs for data transfer. Sony Alpha SLT-A99 has a Mini Type C HDMI and Sony Alpha SLT-A77 II has a Mini HDMI connector for video signal output.

Battery

Sony Alpha SLT-A99 and Sony Alpha SLT-A77 II come with NP-FM500H battery pack with battery life of 500 shots on Sony Alpha SLT-A99 and with battery life of 480 shots on Sony Alpha SLT-A77 II.

External Storage Slots

Sony Alpha SLT-A99 has two card slots - one for Single Slot: SD/SDHC/SDXC, Memory Stick Duo/Pro Duo/Pro-HG Duo and one for . Sony Alpha SLT-A77 II has a single SD/SDHC/SDXC/Memory Stick Duo Hybrid (UHS-I) card slot.

Shutter

Sony Alpha SLT-A99 has Electronically controlled Vertical-traverse Focal-plane shutter. Shutter speed can go up to 1/8000 sec on Sony Alpha SLT-A99, and up to 1/8000 sec on Sony Alpha SLT-A77 II. Sony Alpha SLT-A99 can shoot continuously up to 6.0 fps. Sony Alpha SLT-A77 II can shoot continuously up to 12.0 fps.

Focusing

Sony Alpha SLT-A99 has 19 (11 cross-type) focusing points and Sony Alpha SLT-A77 II has 79 (15 cross-type) focusing points. Sony Alpha SLT-A77 II has detection range from -2 to +18 EV.

Exposure

Exposure meterings of Sony Alpha SLT-A77 II ranges from -2 to +17 EV and you can set the exposure compensation within the ±5 EV range. You can also do exposure lock, exposure bracketing and manual exposure adjustment on Sony Alpha SLT-A99 and exposure lock, exposure bracketing and manual exposure adjustment on Sony Alpha SLT-A77 II.

Flash

Sony Alpha SLT-A77 II has a built-in flash with maximum range of 12.00 m at ISO 100 and also accepts external flash which can be connected via Hot Shoe or PC Terminal or Proprietary or Wireless connection. Sony Alpha SLT-A99 has no built-in flash but an external flash may be connected via Hot Shoe. The fastest flash synchronization speed is 1/250 sec on both cameras.

Sony Alpha SLT-A99 body has dimensions of 147 x 111 x 78 mm (5.79 x 4.37 x 3.07") and Sony Alpha SLT-A77 II body has dimensions of 143 x 104 x 81 mm (5.63 x 4.09 x 3.19"). Sony Alpha SLT-A99 weighs 812 g (1.79 lb / 28.64 oz) and Sony Alpha SLT-A77 II weighs 647 g (1.43 lb / 22.82 oz).

Sony Alpha SLT-A99

Sony Alpha SLT-A77 II

147 mm

111 mm

143 mm

104 mm

111 mm

104 mm

78 mm

81 mm