BS ISO 8600-3:2019 pdf free download.Endoscopes — Medical endoscopes and endotherapy devices — Part 3: Determination of field of view and direction of view of endoscopes with optics.
BS ISO 8600-3:2019 applies to endoscopes designed for use in the practice of medicine. It specifies measurement requirements and describes two test methods for measuring the field of view and direction of view of endoscopes. Method A uses the distance from the distal window to calculate the field of view. Method B uses the distance from the entrance pupil. Other test methods can be used if they obtain equivalent results.
Normative references
ISO 8600-1, Endoscopes-Medical endoscopes and endotherapy devices-Part 1: General requirements;
ISO 8600-6, Optics and photonics- Medical endoscopes and endotherapy devices-Part 6: Vocabulary.
Method A applies only if the measuring distance is at least 30 times larger than the distance between the distal end and the entrance pupilla] and the accuracy requirement in IS0 8600-1 is satisfied. Otherwise, the error caused by the distance between the distal end and the entrance pupil in Method A will lead to a systematic measurement error.
Method B may be used at any distance. In general, any method is allowed which has the entrance pupil as reference. Details about test Method A and Method B for measuring endoscope field of view and direction of view, including their shortcomings, accuracies, application prerequisites (e.g, endoscope with a close focus distance and capsule endoscopes should only use Method B),etc, can be found in the reference.

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