Optics and photonics. Optical transfer function. Application - Telescopes1 Scope This document specifies a method of testing telescopes in terms of imaging states aimed at making valid optical transfer function (OTF) measurements. This document includes two annexes (Annex A and B) that provide information on the more recent techniques for measuring optical transfer function and methods of deriving image quality criteria from such measurements.

This document is applicable to fittings of the following types:

Why should you use BS 215-1 - Specification for aluminium conductors

users have access to copper tubes that are safe for use

Incorporation of the Regulation (EU) No 305/2011 of the European Parliament and of the Council of 9 March 2011 laying down harmonized conditions for the marketing of construction products and repealing Council Directive 89/106/EEC terminology

whether it is superseded and (if applicable) the relationship to international and national standards

accuracy of operating data and protection against hazardous output

If you are a manufacturer of spherical plain bearings used in the aerospace industry

• protection principle covering: principle for non-isolated microgrid

Residual solvents are chemicals used in the preparation of products that could cause a danger to the health of consumers

and the outer surface temperature was approximately 110 °C

BS EN 12812 also gives simplified design methods for falsework made of tubes and fittings

experimental design