Preservation

Aerial Photo Median - Sheet and Roll Film [AEF-P4]

Record Type Aerial - Film Negatives and Positives
Expected Use Preservation Master
Product Name Aerial Photo Median - Sheet and Roll Film [AEF-P4]
Product Purpose

The purpose of this product is to mitigate risk for loss of information and fulfill researcher/user expectations and requests. This file is at an appropriate information capture level to substitute for the original record if the original record copy is no longer viable.

Nature of Source Material

B&W aerial film negatives with a size range of 10” x 10” cut acetate sheet film or/and 10” wide acetate roll film (usually spliced together in up to 500’ lengths) where there is a need to ensure that all significant visual information is carried forward.

Film Stock

Sheet film: Agfa Avitone PD3P-OS (EDPRM); Roll film: Agfa Avitone PD1P-OS (ECXFO).

Other Information
  • This product is a film to film duplicate.
  • This product has a negative tonal orientation made from negative source material.
  • Cut sheet film products are initiated as part of the yearly Preservation Work Plan created in conjunction with custodial units.
  • Roll film products are initiated from repeated customer requests. Roll film originals are held in off-site storage. If the record is requested more than twice, a new preservation copy is created and stored on site for future use.
  • Distribution copies are made by external vendors.
Quality Control Quality Assurance and Quality Control for Hard Copy Aerial Photo Negative Products
Rationale

While the capture process for most original photograph, text-based and object/artifact original source material record types is file-based and results in digital products, there are limited options for hard copy outputs. The first is aerial photonegative prints. While digital capture specifications are established for aerial photo negatives and film positives, this workflow remains an analog-to-analog film duplication process at this time. The lab expects to transition to analog-to-digital workflow in the future. A second area is microfilm. Polyester-based silver gelatin microfilm is generated from digital preservation master files for text and cartographic collections captured in the Photographic Imaging, Microfilm and Textual Preservation Lab and then stored off-site in a climate controlled limited access vault. In addition, polyester-based silver gelatin microfilm copies are available for the Microfilm Publications beginning with the M, P. C or T prefix. Third, there is a very limited option to produce facsimile prints from digital files for specifically identified purposes only.

Currently, the digital distribution copy options are generally the same for all still images regardless of the format of the original source material.

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