Microfiche are sheets of film, they are usually A6 size and contain images set in a grid pattern in regular rows and columns. An eye-legible title along the top of the microfiche permits instant identification without the need for magnification. Standard microfiche are produced to strictly controlled layouts which permit the retrieval of any image via a co-ordinate representing the intersection of the row and column where it is located. At least one index frame is usually included on the microfiche to provide access to its content without the need for an external index. Fiche conforming to ISO and BS Standards thus contain sets of images and integral 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 or they can be produced from digital input via the COM (Computer Output on Microfilm) process.
Source Microfiche
- 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
COM Microfiche
- 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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