What is an aperture card?
An aperture card is a single 35mm microfilm picture mounted on a data card that looks much like a punched data card. Aperture cards are normally used for large format drawings. Most aperture cards are punched with something called Hollerith data. This data contains information which is typically a drawing number and revision number. When your cards are converted, our equipment reads this data and can use the data to either name the converted image file, or to produce a data file with the information.
