202. 112a Signal limit glasses, each. 202. 112b IPL calibrating filters, calibrated for chromaticity coordinates and 202. 112c Calibration for transmittance at an additional color temperature 202. 112z For special tests not covered by the above schedule, fees will be charged dependent upon the nature of the test... *For current fees, see Appendix C. 202.114 Radiometry. Item (*) (*) 202.114a Eye protective glasses-calibration for transmittance of ultraviolet, (*) 202.114b 202.114c Calibration of radiant energy meter for energy of 2537 Å.. (*) (*) 202.114h Standard of spectral irradiance-quartz iodine lamp seasoned and (*) 202.114z For special tests not covered by the above schedule, fees will be Tests of telescopes, microscopes, binoculars, etc., to determine con- 202.202 Photographic objectives. The following information is pertinent to the tests a to n in this schedule. a. This test is applied to photographic objectives that are mounted in a lens barrel or shutA visual or a photographic method is used, depending upon the probable use of the lens. The back focal distance determines the lens position with respect to the focal plane for an ter. airplane camera or other fixed focus camera focused for an infinitely distant objective. The equivalent focal length determines the scale factor for the interpretation of aerial photographs. b. This test is given to the photographic objectives that are to be used in precision copying The information is used in calibrating the camera scales that enable the user to obtain the proper settings of lens, object plane, and image plane for any desired magnification without visual focusing. c, d. This test includes the information obtained in 202.202b, together with information on distortion. It is applied to photographic objectives that are to be used in precision copying cameras where the user wishes to be certain that the relative proportions of the image are not significantly different from those of the object. Since the distortion changes with magnification, it is advisable to specify a ratio for test that corresponds to the magnification most commonly used. e. This is a general-purpose test to determine the suitability of a lens so far as its definition characteristics are concerned. It is performed photographically. In general, if a lens yields satisfactory results when subjected to this test, it is probable that no additional test for lateral chromatic aberration is necessary, and the lens will doubtless perform satisfactorily for either black-and-white or color photography. f. This is a qualifying test for photographic objectives intended for use in airplane mapping cameras. It is a photographic test and the determinations are made for the plane of best average definition. g, h. The f-number may be obtained by dividing the equivalent focal length of the lens by the diameter of the effective aperture. These tests, are primarily of value in determining the accuracy of the geometric f-number markings at maximum aperture and at additional specified apertures. i, j. This test is applied to photographic objectives mounted in cameras. As the test is a photographic one requiring a time exposure, it is necessary that the stop be open when the lens is submitted for test. This is a useful test for nonprecision type airplane cameras where the collimation index markers are located in a detachable magazine. k. This test is applied to the platen of a precision aerial mapping camera, which is the surface against which the film is pressed during exposure. It is a test to determine conformance to specifications requiring that the platen shall not depart from a true plane by more than 0.0005 in. 1. This test is applied to photographic objectives mounted in cameras. It gives the same information as test 202.202f except for back-focal distance. It is preferable that these lens characteristics be determined for the lens as mounted in a barrel shutter, but occasionally it is desirable to determine these quantities for the lens mounted in a camera. The shutter of the lens should be open when the camera is submitted for test. m. This test is applied to a lens-camera combination that is to be used in photogrammetric mapping. It gives the departure of the principal point of autocollimation from the center of collimation which is the intersection point of lines joining opposite pairs of collimation index markers. The equivalent focal length of the lens as mounted in the camera is determined in this test along with the radial asymmetric distortion which checks whether the lens has been properly mounted to yield best average definition throughout the image field. This test cannot be performed on a camera having a detachable magazine which bears the collimation index markers. This is the preliminary test on a precision type camera to determine compliance with specifications. If no provision has been made for ready adjustment of the collimation index markers and the 90° condition is not satisfied, the camera is returned to the firm or agency submitting the camera with recommendations regarding the necessary adjustments. If the 90° condition is satisfied, but no provision has been made for ready adjustment of the principal point with respect to the center of collimation, the camera is returned with recommendations regarding the necessary adjustments. n. If no provision has been made for ready adjustment of the lens in a transverse direction to properly position the principal point with respect to the center of collimation, or if 784-291 0-65- 5 this can be done by ready movement of the collimation index markers, this task is done in the course of the test. Following adjustment, the camera is checked and, if satisfactory, pins are set to insure preservation of the space relations between collimation index markers and principal point of autocollimation. When a camera is submitted for test, it is mandatory that the drill holes for the pins be already present in one of the members that move with respect to one another. In addition, a proper sized drill and reamer had a sufficient number of pins to perform the doweling must accompany the camera. It is desired that roll pins be submitted for this task. 202.202b Determination of equivalent focal length, back focal distance, (*) 202.202c 202.202d Determination of equivalent focal length, back focal distance, separa- (*) 202.202e Determination of resolving power at 5° intervals from center to edge (*) 202.202f Determination of back focal distance, equivalent focal length, distor- (*) This is the test usually required for lenses that are to be mounted in precision airplane cameras. 202.202g Determination of equivalent focal length and true geometric f- (*) 202.202k Determination of compliance of camera platen with flatness require- (*) 202.2021 Determination of equivalent focal length, distortion, and resolving (*) 202.202m Location of the principal point of autocollimation, and check of 90° (*) See footnote at end of table. 202.202n Setting the principal point of autocollimation and 90° condition, (*) 202.202z For special tests not covered by the above schedule, fees will be *For current fees, see Appendix C. 202.203 Optical components, spectacle lenses, goggle lenses, etc. Item Description Fee Optical components 202.203a 202.203b Determination of equivalent focal length of single-component lens... (*) (*) 202.203c Determination of spherical and cylindrical power, axis of sphere, and (*) 202.203d Fee for each additional lens.___ (*) 202.203e Determination of spherical and cylindrical powers, axis of sphere, and Determination of refractive power, surface quality, and definition to Determination of lens dimensions, refractive power, prismatic power, For special tests not covered by the above schedule, fees will be *For current fees, see Appendix C. (*) (*) Every instrument submitted for test should be in good working order. The test slab or standard supplied by the maker, and the tables if any, must accompany each refractometer. Upon request special attention will be given to such portions of the scale as may be of particular importance in the contemplated use of the instrument. Refractometers with compensators will be tested with "white" light unless otherwise specified. Refractometers without compensators will be tested only with sodium light unless otherwise specified. 202.204z For special tests and calibrations of refractometric measurements, fees Fee 202.205 Refractive indices. When submitting media for index measurement, the temperature, wavelength of light (or spectral line), and approximate degree of desired precision should be specified. Liquid samples should usually be as large as 10 ml. Solids for item d must be in the form of test slabs, approximately 1x 1⁄2 x 1⁄2 in., such as are commonly used for the adjustment of Abbe refractometers. Two surfaces must be pitch polished (plane within approximately one wavelength) and intersect at 90° to form an unbeveled edge. Item 6 202.205a 202.205b 202.205c Index of refraction (±1×10-4) for D spectrum line for one liquid by Determination of index for single temperature... Determination of index for each additional sample submitted at the One index determination at each additional temperature... Index of refraction (±1×10-4) for D spectrum line for one solid by Determination of index for one sample. 202.205d 202.205e Determination of index for each additional spectrum line, C, F, or G. 202.205z For special tests not covered by the above schedule, fees will be *For current fees, see Appendix C. |