Microfiche are sheets of film, usually A6 in size and containing images set in a grid pattern of regular rows and columns.
An eye-legible title along the top of the microfiche allows for simple identification. Standard microfiche are produced on a uniform layout, which permits images to be easily retrieved through a system of coordinates (based on row-column intersection of image locations). At least one index frame is usually included on the microfiche to list its content, in place of an external index. Fiche conforming to ISO and BS Standards thus contain sets of images and internal indexing, enabling them to be duplicated and distributed as required. The images can be recorded from paper originals (source Microfiche), using special step-and-repeat cameras. Alternatively, they can be produced from digital input via the COM (Computer Output on Microfilm) process.
- 24X reduction source microfiche = 14 images across x 7 images down with a maximum of 98 frames
- 36X reduction source microfiche = 24 images across x 12 images down with a maximum of 288 frames
- 42X reduction source microfiche = 25 images across x 13 images down with a maximum of 325 frames
- 48X reduction source microfiche = 28 images across x 16 images down with a maximum of 448 frames
- 24X reduction microfiche = 9 images across x 7 images down with maximum 63 frames
- 42X reduction microfiche = 16 images across x 13 images down with maximum 208 frames
- 48X reduction microfiche = 18 images across x 15 images down with maximum 270 frames
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