CRC (Close Range Correction System)
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CRC
Cyclic Redundancy Check. An algorithm that recursively generates a 16- or 32-bit numerical value based on a stream of data. The value can be used to verify whether the data has changed. See digital signature.
D-2 ...
CRC (Close Range Correction System): Check Nikon's terms page for more.
Noon, CRC Press (1992).
Forensic Engineering Investigation by Randall K. Noon, CRC Press (2000).
Forensic Materials Engineering: Case Studies by Peter Rhys Lewis, Colin Gagg, Ken Reynolds, CRC Press (2004).
Correction of Aberrations at Close Distance Focusing (or CRC):
In general, lenses are designed for maximum performance at infinity. Accordingly, when the lens barrel is fully extended to the shortest focusing distance, resolution is reduced.
CRC (Close Range Correction) System The Close-Range Correction (CRC) system is one of Nikon's most important focusing innovations, for it provides superior picture quality at close focusing distances and increases the focusing range.
If you set the lens to the wrong distance, the corrections will be all wrong. CRC and modern zoom lenses are very picky about having the correct flange focal distance to get optimum performance, especially in the corners with wide lenses.
Lens Construction - 10 elements in 7 groups (includes 1 ED element)
Aperture Range - 2.8 to 22
Fixed lens hood (plastic)
Lens Designations - ED SIC CRC D G DX (glossary available on Nikon site) ...
CRC checksums are much quicker to calculate than their equivalent MD5 checksums, but MD5 checksums are also more sensitive to file changes. There are other checksum file types available, but SFV and MD5 are currently the most widely supported.
 See also: Image, Camera, Photograph, Sensor, Lens
  
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