Photography. Apertures and related properties pertaining to photographic lenses. Designations and measurements1 Scope This International Standard pertains to apertures and related properties of photographic lenses affecting the illuminance at the centre of the image. This International Standard specifies aperture markings for all types of lenses used in still cameras, and gives tolerances for the stop numbers. It also defines aperture stop, entrance pupil, focal length, relative aperture and stop numbers, and gives methods for their measurement or

NOTE For marble dolomite (BET procedure as defined in ISO 9277 below 500 m2/kg)

and operational systems from the engineering perspective

2 – Light microscopes for

BS EN 1465 specifies a method for determining the tensile lap-shear strength of bonded assemblies when tested on a standard specimen and under specified conditions of preparation and testing

Information is provided on how to use this method for testing chemicals under temperate as well as under tropical conditions

Significant rehabilitation of existing reservoirs

EN 3372-009 and EN 3372-010

basic vehicle data (4

As shown in BS IEC 62153-4-6 the injection circuit is constructed as a transmission line using one or more parallel wires

1) in air temperatures from – 5 °C to +40 °C with an average value over a period of 24 h not exceeding +25 °C

BS ISO 26202:2019 replaces the first edition (ISO 26202:2007)

BS EN IEC 61163‑2 is applicable to: