The camera used was a Canon EOS Rebel T5i with a Canon EF-S 18–55MM f/3.5–5.6 IS STM lens. The camera was connected to a computer via a USB. The camera was positioned over the opening of the evenly lit chamber. A picture of the sample on the template was taken via tethered capture using Adobe Lightroom Classic CC version 7.3.1.
Ef s 18 55mm
Manufactured by Canon
Sourced in Japan
The EF-S 18–55mm is a standard zoom lens designed for Canon's APS-C format digital SLR cameras. It provides a focal length range equivalent to 29–88mm in 35mm format. The lens features an optical design with 11 elements in 9 groups, a maximum aperture of f/3.5–5.6, and a minimum focusing distance of 0.25m.
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Lab products found in correlation
3 protocols using ef s 18 55mm
1
Imaging Equipment Setup for Sample Analysis
2
Standardized Head Position Photography
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Photographs were taken in profile, using a Canon EOS 1100D digital single-lens reflex (DSLR) camera with a standard zoom lens (EF-S 18-55 mm, Canon) and a tripod with adjustable height. The distance from subject was set at 1.6 m, the focal length at 50 mm, and the focal ratio at f/5.6. To minimize optical distortions, participants remained seated on a chair that had been bolted to the ground. All were trained to slant their heads upwards and downwards until they felt relaxed and adopted a natural head position (NHP). NHP is defined as an innate, physiological, and reproducible position achieved when a person is in a relaxed sitting or standing position, looking at the horizon or at an external reference point (a mirror, a point on the wall) at eye level.20 (link) It is considered a normalized and stable head position21 representing the natural real-life posture of human beings.22 The edge of each photograph was regarded as the true vertical (TV) reference for FID measurement.
3
Standardized Whole-Body Photography
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Before and after each sunscreen application participants had a series of standardized pictures of the whole body taken at fixed distances. We used a digital camera (Canon EOS 450D, EF-S 18–55 mm, Canon Inc., Japan) with an aperture of F:5.6, ISO of 1600 and shutter speed of 1/15. The participants were photographed in a black box with full-height fluorescent tubes (TL08, Philips, The Netherlands) emitting primarily UV-A radiation but also some visible light up to a wavelength of 410 nm. The pictures were assessed as blue channel pictures using GIMP version 2.8.14 (www.gimp.org ).
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