scope:

This standard is issued for the purpose of establishing uniform definitions, nomenclature, classification of defects, methods of testing, and measurements pertaining to the field of photographic lenses. An appendix, containing nonmandatory reference material, is provided for use in the preparation of specifications and other procurement documents.

This standard covers photographic lenses typed according to their use. The keywords are italicized for convenient reference.

Aerial Reconnaissance. A type I lens shall be suitable for use in aerial reconnaissance. It will be used at or near infinity focus and usually will have low distortion and a flat field.

II. Aerial Mapping. A type II lens shall be suitable for use in accurate aerial mapping. It will be used at or near infinity focus and usually will have a flat field. The distortion characteristics in this type of lens are usually designated and controlled within precise limits.

III General Photographic. A type III lens shall be suitable for use in view camera and hand-held still cameras. It will be used to photograph both near and distant objects.

IV Process. A type IV lens shall be suitable for use in photolithography, process work, and precise reproduction from flat copy. It will be used at or near unity magnification. In this type of lens, lateral and longitudinal chromatic aberration, secondary spectrum, and distortion are corrected to a high degree.

V Motion Picture Camera. A type V lens shall be suitable for use in motion picture cameras. It will be used to photograph both near and distant objects. A type V lens differs from a type III lens in that it usually is of shorter focal length and smaller field of view.

VI Enlarger. A type VI lens shall be suitable for use in photographic enlargers. It will be used at finite magnifications, will usually have low color aberrations, and in certain applications distortion characteristics will be designated and controlled within precise limits.

VII Projection. A type VII lens shall be suitable for use as an objective lens in motion picture, film strip, opaque, slide, and overhead projectors. It will be used at finite magnification and will have a flat field. This type of lens usually differs from a type VI lens in that it is faster, covers a smaller field of view, and has less correction of aberrations.

VIII Photomicrographic. A type VIII lens shall be suitable for use in photomicrography. It will be used with the object at the shorter conjugate.

IX Portrait. A type IX lens shall be suitable for use in portrait photography. It will be used to photograph both near and distant objects. It usually differs from a type III lens in having less correction of aberrations.

X Viewfinder. A type X lens shall be suitable for use in viewfinders.

XI Condenser. A type XI lens shall be suitable for use in condensers. It will be used for the collection and distribution of radiation in projection and enlarging systems.

XII Copying. A type XII lens shall be suitable for use in reproduction from flat copy. It will be used at or near unity magnification. It usually differs from a type IV lens in that it has greater lens speed and less correction of aberrations.

XIII Microphotographic. A type XIII lens shall be suitable for use in microfilming and microcopying. It usually will be used at magnifications between 0.1 and 0.024.

XIV Recording. A type XIV lens shall be suitable for use in recording instruments or fluorescent screen presentation. It will be used at a finite magnification and generally will be of a special design to meet the specific requirements.