AS ISO 19093:2020 pdf download.Photography – Digital cameras – Measuring low-light performance.
4.2 Camera settings
4.2.1 General
The camera shall be fixed on a test bench during all the tests. The test needs to produce comparable results over a huge variety of different cameras. The biggest challenge is to provide a fair comparison between cameras with no control elements for the image capture (like exposure, ISO sensitivity, etc.) and cameras that require or at least allow full control over all functions and features.
4.2.2 Test lenses
For low-light performance comparison of cameras with interchangeable lenses, lenses with the same open aperture and 35 mm film equivalent focal length shall be used.All cameras shall be tested at 28 mm focal length (35 mm sensor equivalent) if available. The reason for using the same equivalent focal length is to get comparable results for all cameras. In case of fixed focal length most cameras consist of a slight wide angle lens with an equivalent focal length around  28 mm, which is the reason why this focal length is to be the default. Open aperture shall be used for all measurements.
4.2.3 Auto focus
All images should be captured using the auto focus (AF) function. In case a camera does not have an AF, it shall he reported together with the results.
When a test camera has an AF function, refocusing is required for every capture. An object may be put between the test chart and the camera to trigger the refocusing. The auto focus mode of the camera can have an impact on the results and shall therciore be reported together with the results.
When a tested camera fails to focus at some light levels, a column should he added to the result table indicating at which light levels this was the case. The camera’s focus indicator, if available, may he used to identify a focus failure. Focus failure may be determined by visually examining the image for noticeable poor focus.
If a camera with an AF function is tested in manual focus mode, the tester shall verify that the AF function works under all lighting conditions. The verification needs to be mentioned together with the results.
4.2.4 Quality and file type
In case the purpose of the use of this document is to compare the raw images of different cameras, the raw images shall be captured and ideally be processed using the same raw processing software with identical settings. If no raw processing software that can process all images is available, then multiple processors should be configured to use comparable settings and produce comparable results. The raw processing software used and the fact that the comparison is based on raw images shall be explicitly mentioned together with the results.
In all other cases, the compared images are output-referred images that were processed in the camera. In these cases, cameras should be set to produce the highest image quality (lowest compression). This is typically a mode that creates a final TIFF or JPEG file.
4.2.5 ISO sensitivity setting
If available, the ‘auto ISO sensitivity” feature for automatic scene dependent signal amplification shall be used. If available, the handheld limit exposure time shall be selected as the longest exposure time (see 5.1).
In case this feature is not available, then for each illumination level, the ISO sensitivity value shall be set as follows:
a) Determine the handheld limit exposure time.
b) Set ISO sensitivity value such that exposure time shall not exceed the handheld limit exposure time.
4.2.6 White balance
The white balance shall be set to automatic.
4.2.7 Flash
No flash or camera built-in light sources shall be used or switched on. For cameras where these cannot be switched off, this test is generally not applicable. In some cases, it can be possible to cover the built- in light sources and perform the test.AS ISO 19093 pdf download.