Sony A7S Memory Card Compatibility

By Nathaniel Stephan
Last Updated: October 16, 2019
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Sony SD Memory Card Compatibility

The Sony A7S is able to use 2 types of memory cards. SDXC, SDHC, and SD memory cards are compatible as well as Sony XC-HG Duo, PRO-HG Duo, and PRO Duo memory.

The camera only has one card slot. You will need to pick between an SD or PRO Duo memory card.

Sony is the sole owner of the PRO Duo format. Consequently, SD memory cards are more cost-effective and frequently provide greater performance than PRO Duo memory cards.

In a hurry? My advice is to get this SD card to use in the A7S:

SanDisk Extreme Pro 128GB UHS-I SD Card

SanDisk Extreme Pro 128GB SD Card

  • Best value for the money.
  • Capacities from 32 GB to 2TB.
  • Transfer speeds up to 170 MB/s.
  • Class 10 & UHS-I
  • Temperature Proof, Water Proof, Shock Proof, and X-ray Proof.

Best SD Cards

SanDisk, Lexar, and PNY are brands that make the best SD cards. The best memory cards I have used have been the SanDisk Extreme Pro SD cards.

You do not need to buy a card from SanDisk for your Sony ILCE-7S. Just make sure the name is cool. That will mean you get fast read/write speeds, shock resistance, and other professional features.

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

The issues I have had with cards has been when inexpensive no-name brands were used. A low-cost card increases the chance of card errors or data corruption.

If you are looking to save money, don't buy a generic card. You will avoid problems by purchasing a high-quality SD card with a smaller storage capacity.

Recommended SD Cards

SanDisk Extreme Pro 128GB UHS-I SD Card

SanDisk Extreme Pro 128GB SD Card

  • Best value for the money.
  • Capacities from 32 GB to 2TB.
  • Transfer speeds up to 170 MB/s.
  • Class 10 & UHS-I.
  • Temperature Proof, Water Proof, Shock Proof, and X-ray Proof.
Lexar Professional 1066X 128GB SD UHS-I Memory Card

Lexar Professional 1066x 128GB SD Card

  • Lexar Professional Silver Card.
  • Transfer speeds up to 160 MB/s.
  • Class 10 & UHS-I.
  • Includes Lexar Recovery Tool Software.
  • Designed for durability in harsh conditions.

Check price at: Amazon, Adorama, eBay

PNY Elite Performance SDXC 128GB Memory Card

PNY Elite Performance 128GB SD Card

  • Lower priced card.
  • Transfer speeds up to 95 MB/s.
  • Class 10 & UHS-I.
  • Magnet, Shock, Temperature, and Waterproof.

Check price at: Amazon, Adorama, eBay

Sony A7S SD Card Compatibility

SD, SDHC, and SDXC memory cards are compatible with the Sony A7S. Use a card to get the best overall performance from the A7S.

The most recent SDUC cards will not be useable in the A7S.

Currently, there are four different types of SD (Secure Digital) cards. New memory specs add more tech that provides for larger storage capacity and improved transfer 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

The speed rating of an SD card is determined by the sequential write and read speeds. Memory card write speed is important for video and continuous shooting.

A slow card can cut down the number of continuous images the Sony A7S can capture. This is due to the camera's buffer not being able to write data to the card quickly enough.

When recording video, a slow SD card can cause a sudden end to the recording. The video file may also end up being corrupted. If you intend to capture video, it is crucial the SD card you use meets the required minimum continuous write speed for video.

Read speed is nice to have for transferring files to a computer or laptop. If you are filling up cards with images or video, a card with a fast read speed will cut down on 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 A7S requires no less than a Class 4 SD card.

An SD card is labeled with a Class rating based on the sustained continuous data write speed of the memory card. Class 10 is the highest rating, even though SD cards exist that have a faster read speed.

Here you can see all of the Classes and associated minimum 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 memory card worth buying for the Sony A7S will be a Class 10 memory card. In the time period since the camera was launched, Memory cards have gotten 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 available in SDHC, SDXC, and SDUC cards. The UHS bus memory cards to achieve faster read and write speeds.

Three different specifications exist. They are UHS-I, UHS-II, and UHS-III.

Look at the front of the card to find out the UHS rating of an SD card. A Roman numeral I, II, or III on the front of the SD memory card, that is the UHS rating of your SD 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 A7S PRO Duo Card Compatibility

One PRO-HG Duo or PRO Duo cards can be used in the Sony A7S. What PRO-HG signifies is that the memory card has a minimum read speed of 50mb/s and a 15mb/s minimum write speed.

PRO Duo memory cards are often double the price of an SD memory card. Considering the price difference, I will not recommend purchasing a PRO Duo memory card for use in a A7S.

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.

  • 32GB - 9,280 images
  • 64GB - 18,560 images
  • 128GB - 37,120 images
  • 256GB - 74,240 images
  • 512GB - 148,4800 images

Related Cameras

At this time you have learned all the things about PRO Duo and SD memory cards. The SanDisk Extreme Pro 128GB is the best Sony ILCE-7S memory card.

Here are a few more cameras that use similar memory cards as the Sony A7S:

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