With the ability to not only digitize the cards quickly on demand, directly distribute via e-mail or just send direct to scaled print, the scanner‘s powerful image processing tools have allowed the engineers to easily view and manage the drawings in digital form.

The Royal Air Force Battle of Britain Memorial Flight case study

Crowley C400 Aperture Card Scanner

Easily Capture Aperture Cards
and Hollerith Punch Data

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The C400 aperture card scanners are designed to digitize all formats of 35 mm microfilm aperture cards and punch Hollerith data. The compact aperture card scanners are able to digitize at production levels using an automatic feed system that can scan batches of 150 cards unattended or can be manually fed for on-demand card capture. Advanced image enhancement and editing tools are included, adding versatility and ease to this aperture card scanner. Once scanned, the data from the aperture cards can be accessed instantly for viewing, printing, email, distribution or storage. Aperture card readers allow for the easy digitization of this valuable medium.

What are Aperture Cards?

Although you’re likely familiar with this medium, they’re currently rare enough that a brief description of their purpose and function is worth noting.

Aperture cards were first put to use for their current purposes in the mid 20th century. Their adoption accompanied the rise of early computers, which were designed to process the data contained on the cards. Like other microfilm, aperture cards are purposed to compress data into a smaller format, making duplication and transfer easier than it would be if data remained full-sized.

They do this through a series of physical hole punches representing coded data. Additionally, the cards contain miniaturized microfilm chips, allowing for image storage.

For decades, these cards were the preferred method of data storage for many industries due to their ability to be easily read, indexed, stored and quickly retrieved by computer.

  • Affordable
  • High-quality images at full resolution
  • Hollerith (punch) data is automatically read and used to select drawing sizes and file names, if required
  • On-demand and batch scanning modes included as standard feature
  • Virtual rescan automatically reprocesses the scanned image with alternative imaging parameters, eliminating the need for rescans
  • Capable of scanning any ISO aperture card with no extras or modifications to purchase
Interested in other scanner options? View Crowley’s full line of aperture card scanners.

Visit Crowley's Microform Scanners YouTube playlist for product videos

C400 Brochure

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Blog: Aperture Cards: The Last of an Art Form

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C400 PC Specifications


Processor Recommended – Intel Core i5
Memory Recommended – 8 GB or more
Hard Drives 120 GB SATA
CD Drive Required. DVD software included with delivery; electronic delivery upon request
Monitor No recommended specification
Operating System Windows 10 Pro (64 bit only with Intel Processor)
USB Interface USB 2.0 Hi-speed 480MHz

The Crowley Company pursues a policy of continuous product improvement and reserves the right to change these specifications without notice.

Visit Crowley’s Technical Support section for information on scanner maintenance, warranty, contract options and more.