RMS thread

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The RMS thread is an objective thread used in microscopy and photography. It is also referred to as W 0.8 "× 1/36".

history

Until the middle of the 19th century, there was a large number of individual connection solutions with different thread types for microscope objectives. From 1857 the Royal Microscopical Society discussed a standard thread for microscope objectives and from 1858 recommended the Whitworth thread W 0.8 "× 1/36" in its journal Trans. Microscopical Society . The standard was further refined in 1911 and revised in 1915.

This thread is standardized today with the ISO 9345: 2019-03 standard, which replaces the DIN / EN / ISO 8038-1 standard.

The thread was a widely used standard for photographic lenses for exposures in the range of one to fifty times magnification. The generally offered focal length range was between 10 and 70 mm. It is no longer used for autofocus cameras, it is still used in microscopy.

See also

Footnotes

  1. ↑ Trans. Microscopical Society, p. 39 (1858) and p. 92 (1859)
  2. ↑ W 0.8 "× 1/36" corresponds metrically to approx. 20.32mm × 0.71mm
  3. ↑ Trans. RMS on p. 175 (1911)
  4. ↑ Journal of the Royal Microscopical Society, pp. 230-231 (1915) Online in the Biodiversity Heritage Library

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