Best Sony A99 Memory Card

By Nathaniel Stephan
Last Updated: October 13, 2019
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Best Sony A99 Memory Card

The Sony A99 is able to use 2 types of memory cards. SDXC, SDHC, and SD memory cards are compatible and in addition Sony PRO-HG Duo and PRO Duo memory.

There are two memory card slots in the A99. One of the slots only takes SD cards, the other slot can use SD or PRO Duo memory cards.

PRO Duo memory cards are a proprietary memory format held by Sony. For that reason, SD memory cards are quite a bit cheaper and can provide greater performance than PRO Duo memory cards.

In a rush? My unbiased recommendation is to get this SD memory card to use in the A99:

SanDisk Extreme Pro UHS-I SDHC Memory Card

SanDisk Extreme Pro 32GB SDHC Memory Card

Leading price to performance ratio. Transfer speeds are good enough to use in a camera upgrade.

Best SD Cards

SanDisk, Lexar, and PNY are manufacturers that make high-quality Memory cards. The best SD cards I have owned have been SanDisk Extreme Pro memory cards.

You do not need to purchase a card made by SanDisk for your Sony SLT-A99. Make sure the name is cool. That will ensure you get fast read/write rates, dust resistance, and other professional features.

I have not run into issues with PNY Elite Performance or Lexar Professional SD cards.

The issues I have had with memory cards has been when I have used inexpensive "" brands. Not having a brand name increases the chance of data corruption or card errors.

If you are looking to spend less, don't buy a generic card. You will avoid problems by purchasing a name brand SD card with a reduced storage capacity.

Recommended SD Cards

SanDisk Extreme Pro UHS-I SDHC Memory Card

SanDisk Extreme Pro 32GB SDHC Memory Card

  • Best value for the money.
  • Capacities from 16 GB to 128 GB.
  • Transfer speeds up to 80 MB/s.
  • Class 10.
  • UHS-I
Lexar 633x 23GB UHS-I SDHC Memory Card

Lexar Professional 633X 32GB SDHC UHS-I Card

  • High speed card.
  • Capacities from 16 GB to 1 TB.
  • Transfer speeds up to 95 MB/s.
  • Class 10.
PNY Flash Memory Card Elite Performance 32GB SDHC UHS-I

PNY Elite Performance 32GB SDHC Card

  • High quality card.
  • Transfer speeds up to 95 MB/s.
  • Class 10.
  • UHS-I.

Sony A99 SD Card Compatibility

SDXC, SDHC, and SD cards can be used by the Sony A99. In order to get the most overall performance from the A99, use an SD card.

The most recent SDUC memory cards can't be used with the A99.

Currently, there are four specs of SD (Secure Digital) memory cards. Newer memory specifications add more tech that allows for increased storage space as well as improved read/write speeds.

  • Secure Digital (SD) - 128MB to 2GB.
  • Secure Digital High Capacity (SDHC) - 4GB to 32GB.
  • Secure Digital eXtended Capacity (SDXC) - 64GB to 2TB.
  • Secure Digital Ultra Capacity (SDUC) - 4TB to 128TB.

SD Card Speed

Speed ratings of an SD memory card is based on the sequential write and read speeds. Memory card write speed is essential for continuous shooting as well as video.

A slow SD card can cause a drop in the number of continuous images the Sony A99 can take. This is due to the camera's buffer not being able to write data to the SD card quickly enough.

When shooting video, a slow SD card can cause an unexpected end to recording. The video file might also end up being corrupted. If you are going to record video, it is crucial the SD card you use meets the required minimum continuous write speed for video.

Card read speed is nice to have for transferring files to a computer or laptop. If you have cards that are full, a SD card with a fast read speed will reduce the transfer time.

Speed Class Rating

Example of where to find SD Card Speed Class
10 inside of a C showing that the SD card is Class 10.

The Sony A99 requires no less than a Class 4 SD card.

An SD memory card gets a Class rating based on the sustained continuous data write speed of the memory card. Class 10 is the best rating, even though memory cards are available that are quite faster.

Here are all of all of the Classes and associated lowest read/write speeds:

  • Class 2 - 2MB/s
  • Class 4 - 4MB/s
  • Class 6 - 6MB/s
  • Class 8 - 8MB/s
  • Class 10 - 10MB/s or faster

Nearly every SD card worth picking out for the Sony A99 will be a Class 10 SD card. In the short time since the launch of the camera, SD cards have gotten so much faster.

Ultra High Speed (UHS)

Example of an SD memory card with a UHS-I rating.
This card has a UHS-I rating. UHS-II and UHS-III cards will have II or III, respectively.

The Ultra High Speed (UHS) bus is built into SDUC, SDXC, and SDHC cards. The UHS bus makes it possible for increased file transfer rates.

There are three separate specs. They are UHS-I, UHS-II, and UHS-III.

To find out the UHS rating of a SD card, look on the front of the card. A Roman numeral I, II, or III on the front of the card, that will be the rating of the memory card.

  • UHS-I - Maximum transfer rate of 104 MB/s
  • UHS-II - Maximum transfer rate of 312 MB/s
  • UHS-III - Maximum transfer rate of 624 MB/s

Sony A99 PRO Duo Card Compatibility

One PRO-HG Duo or PRO Duo cards can be used in the Sony A99. What PRO-HG signifies is that the memory card has a minimum read speed of 50mb/s and a 15mb/s minimum write speed.

Sony Pro Duo memory cards are almost always twice as expensive as an SD memory card. Considering the price difference, I will not recommend purchasing a Sony PRO Duo memory card for use in an A99.

Image Capacity

Sony SD Memory Card Contacts

Below is an approximate estimation of how many large JPEG images you can expect to store on each size of SD card.

  • 4GB - 1,160 images
  • 8GB - 2,320 images
  • 16GB - 4,640 images
  • 32GB - 9,280 images

Related Cameras

There is nothing more you need to be aware of about SD and PRO Duo cards. The SanDisk Extreme Pro 32GB is the best Sony SLT-A99 memory card.

Here are a few more cameras that use similar memory cards as the Sony A99:

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