1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 9336-1:2010 Optics and photonics Optical transfer function Application Part 1: Interchangeable lenses for 35 mm still camerasBS ISO 9336-1:2010 BRITISH STANDARD Nationa
2、l foreword This British Standard is the UK implementation of ISO 9336-1:2010. The UK participation in its preparation was entrusted to Technical Committee CPW/172/1, Optics and Photonics - Fundamental Standards. A list of organizations represented on this committee can be obtained on request to its
3、secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2010 ISBN 978 0 580 68686 3 ICS 37.040.10 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard
4、 was published under the authority of the Standards Policy and Strategy Committee on 31 July 2010 Amendments issued since publication Date Text affectedBS ISO 9336-1:2010Reference number ISO 9336-1:2010(E) ISO 2010INTERNATIONAL STANDARD ISO 9336-1 Second edition 2010-06-15 Optics and photonics Optic
5、al transfer function Application Part 1: Interchangeable lenses for 35 mm still cameras Optique et photonique Fonction de transfert optique Application Partie 1: Objectifs interchangeables pour appareils photographiques de 35 mm BS ISO 9336-1:2010 ISO 9336-1:2010(E) PDF disclaimer This PDF file may
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10、 of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedBS ISO 9336-1:2010 ISO 9336-1:2010(E) ISO 2010 All rights reserved iiiForeword ISO (t
11、he International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical commit
12、tee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotech
13、nical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member
14、 bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying
15、 any or all such patent rights. ISO 9336-1 was prepared by Technical Committee ISO/TC 172, Optics and photonics Subcommittee SC 1, Fundamental standards. This second edition cancels and replaces the first edition (ISO 9336-1:1994) which has been technically revised. ISO 9336 consists of the followin
16、g parts, under the general title Optics and photonics Optical transfer function Application: Part 1: Interchangeable lenses for 35 mm still cameras Part 3: Telescopic systems BS ISO 9336-1:2010BS ISO 9336-1:2010 INTERNATIONAL STANDARD ISO 9336-1:2010(E) ISO 2010 All rights reserved 1Optics and photo
17、nics Optical transfer function Application Part 1: Interchangeable lenses for 35 mm still cameras 1 Scope This part of ISO 9336 specifies a method of testing interchangeable lenses for 35 mm still cameras with a picture format of 24 mm 36 mm in terms of imaging states aimed at making valid optical t
18、ransfer function (OTF) measurements. Special lenses for macrophotography, i.e. those designed and manufactured exclusively for obtaining a magnified image are not covered by this part of ISO 9336. 2 Normative references The following referenced documents are indispensable for the application of this
19、 document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 9334, Optics and photonics Optical transfer function Definitions and mathematical relationships ISO 9335:1995, Optics and pho
20、tonics Optical transfer function Principles and procedures of measurement 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 9334 apply. 4 General description of the lenses to be tested The lenses are used in still cameras with a picture format of 24 mm
21、 36 mm. The typical object distance is up to several metres but sometimes more. Some lenses are capable of close focusing with a ratio of reproduction of up to 1:1. 5 Test conditions In general, measurements shall be made with the infinite object/image conjugate and in accordance with the general pr
22、inciples and procedures given in ISO 9335. Measurements should be made at finite distances including the closest focusing distance. When making measurements at a close distance, focusing shall be done by means of the lens focusing ring. Fine focusing may be done with a change in either the distance
23、between the lens and the image analyser or that between the lens and the object, i.e. test pattern. BS ISO 9336-1:2010 ISO 9336-1:2010(E) 2 ISO 2010 All rights reservedIn order to determine the datum plane, focusing shall be done by adjusting the distance between the lens and the image analyser. 6 S
24、pecification of the imaging state 6.1 Test specimen Table 1 specifies an imaging state for the test specimen. 6.2 Measuring equipment Table 2 specifies an imaging state for the measuring equipment. 6.3 Measurement Table 3 specifies an imaging state of the measurement. 7 Presentation Table 4 specifie
25、s an imaging state for the presentation. 8 Accuracy of equipment Overall accuracy, repeatability within one laboratory and reproducibility between several laboratories shall be assessed using known test lenses. Table 1 Parameter Value/setting Notes Aperture (f-number) Maximum (full) and medium apert
26、ures essential Second maximum desirable “Medium” aperture shall be f/5,6, if the lens full-aperture f-number is smaller than f/4. Otherwise, it shall be f/8. The second maximum aperture shall be the one that is one full stop smaller than the full aperture, i.e. the f-number is 1,4 times greater than
27、 the full-aperture f-number; for example, if the full-aperture f-number is f/1,8, the second maximum aperture is f/2,5 (1,8 1,4). If the second maximum aperture cannot be set for some reason, then the next possible f-number, which is more than half a stop greater than the full-aperture f-number, sha
28、ll be used; in the above example, read f/2,8 instead of f/2,5. Reference mark Index mark for distance scale BS ISO 9336-1:2010 ISO 9336-1:2010(E) ISO 2010 All rights reserved 3Table 2 Parameter Value/setting Notes Bench configuration 1) Object at infinity 2) Object and image at finite conjugate (up
29、to 1:1) Spectral characteristics 1) Spectral range: at least 380 nm to 670 nm 2) Light source: tungsten halogen lamp operated at a correlated colour temperature of (3 200 200) K in combination with a blue filter that reduces the intensity of radiation over a wavelength range corresponding to the gre
30、en to infrared region. The relative spectral transmittance of the filter ais shown in Figure 1. 3) Analyser: photomultiplier with S-20 photocathode. Any light source/analyser combination may be used provided that the overall spectral characteristics are the same as those of the 3 200 K/filter/S-20 c
31、ombination. a The Schott BG 38, 1 mm thick, is an example of a suitable product available commercially. This information is given for the convenience of users of this part of ISO 9336 and does not constitute an endorsement by ISO of this product.Key X wavelength, in nanometres Y spectral transmittan
32、ce, in percent Figure 1 Relative spectral transmittance of the filter BS ISO 9336-1:2010 ISO 9336-1:2010(E) 4 ISO 2010 All rights reservedTable 3 Parameter Value/setting Notes MTF/PTF MTF essential PTF desirable Image scale 1: essential Finite distances, including the closest focusing distance, desi
33、rable Focusing 1) On-axis to maximum MTF at 20 mm 1 : at full aperture recommended 2) 30 mm 1recognised Image height (h) 0 0,3 h max0,5 h max0,7 h max0,85 h maxh maxh: half diagonal of the image field (21,6 mm) This set of image heights should be used in intercomparisons of OTF results. However, a d
34、ifferent set of image heights may be selected for special applications. Reference angle () 1) 0, 90, 180 and 270; or alternatively 2) 56, 124, 236 and 304 Two diagonal directions Azimuth Radial and tangential Table 4 Parameter Value/setting Notes Reference plane Datum plane or mounting flange Upper
35、spatial frequency 50 mm 1Higher spatial frequencies may be chosen for special applications. Selected spatial frequencies 1) 10 mm 1 , 20 mm 1and 40 mm 1recommended 2) 10 mm 1and 30 mm 1recognised To be used, for example, when the OTF is given as a function of the image height. Frequencies for numeri
36、cal presentation Ten equidistant frequencies over the range 5 mm 1to 50 mm 1Higher spatial frequencies may be chosen for special applications. Parameter list In addition to the standard parameter list given in 7.1 of ISO 9335:1995, the following data should be listed: position of the measurement pla
37、ne relative to the datum plane; estimated uncertainty of the measurement. BS ISO 9336-1:2010BS ISO 9336-1:2010 ISO 9336-1:2010(E) ICS 37.040.10 Price based on 4 pages ISO 2010 All rights reserved This page deliberately left blankBSI is the independent national body responsible for preparing British
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