Pentax 645Z Memory Card Compatibility

By Nathaniel Stephan
Last Updated: September 30, 2019
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Pentax SD Memory Card Compatibility

SD, SDHC, and SDXC memory cards are manufactured to operate in the Pentax 645Z. Having fast write speeds is an important factor for burst shooting and video.

The SD card you get is a considerable influence on the performance of your camera.

If you're in a hurry, here's the best SD card you can buy for the Pentax 645Z:

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

Like all things tech, the pricing of cards has greatly fallen since the release of the Pentax 645Z.

Seeing as how affordable prices are, it would not be advisable to buy anything besides a professional-quality memory card.

SanDisk Extreme Pro, Lexar Professional, and PNY Elite Performance cards have all worked well for me. I have never suffered from a card break or corrupted data with any of those SD cards.

All of the hassles I have had has been due to cheap unbranded SD memory cards. Hoping to save a buck is not worth it if your 645Z will not function as it should.

To save some money, buy a lower capacity SD card from a high-quality manufacturer. By doing this, you'll not have to be worried about the shots stored on the memory card.

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.
PNY Elite Performance SDXC 128GB Memory Card

PNY Elite Performance 128GB SDXC Card

  • Lower priced card.
  • Transfer speeds up to 95 MB/s.
  • Class 10 & UHS-I.
  • Magnet Proof, Shock Proof, Temperature Proof, Waterproof.
Lexar Professional 1066X 128GB SD UHS-I Memory Card

Lexar Professional 1066x 128GB SDXC UHS-I 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.

Pentax 645Z SD Card Compatibility

You are limited to using SDXC, SDHC, and SD cards with the Pentax 645Z. For best performance, ensure your camera has the latest firmware installed.

The newest cards, SDUC (Secure Digital Ultra Capacity), are unable to be used with the 645Z.

There are four separate kinds of Secure Digital (SD) cards that you need to take into consideration. SD memory cards can be recognized based on the memory card's capacity.

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

Image Capacity

Pentax SD Memory Card Contacts

Here is an approximation of just how many maximum-quality JPEGs shots you should expect to be stored on an SD memory card:

  • 16GB - 4,640 images
  • 32GB - 9,280 images
  • 64GB - 18,560
  • 128GB - 37,120

Speed, Class, & UHS Ratings

Card Speed

Speed ratings of an SD memory card is determined by the sequential read and write transfer speeds of the card. Card speed is important for video in addition to continuous shooting.

A slow card can reduce the number of continuous photos the Pentax 645Z can take. This is due to the camera's buffer not being able to write to the SD card quickly enough.

When shooting video, a slow SD card can cause a sudden end to the recording. The video file may also end up being corrupted. If you are going to capture video, it is essential the memory card you use meets the requirements of the 645Z.

Card read speed is important for transferring files to a computer. If you are filling up cards with images or video, an SD card with a fast transfer speed will save you time.

Speed Class Rating

Example of where to find SD Card Speed Class
The 10 inside of the C means the card is Class 10.

The Class rating of a card is determined by the sustained write speed. SD cards that have a write speed of at least 10MB/s will be labeled Class 10.

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

Every brand-name SD memory card that you can buy today will be Class 10. To discover the class rating of a memory card, search for a number inside of a C on the front label.

Ultra High Speed (UHS)

Example of an SD memory card with a UHS-I rating.
The UHS rating of a card can be determined by a Roman numeral I, II, or III on the label of the card.

The Ultra High Speed (UHS) bus is a feature found in SDUC, SDXC, and SDHC cards. The UHS bus memory cards to have increased read and write speeds.

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

Look at the front of the memory card to find out the UHS rating of an SD card. The presence of a Roman numeral I, II, or III on the label, that is going to be the UHS rating of your SD 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

Related Cameras

If you needed to choose one, the 128GB SanDisk Extreme Pro is the best memory card for the Pentax 645Z. You are now prepared for any future camera you buy.

Below are more posts on digital cameras with similar specs as the 645Z:

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