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doctor hospital healthcare medicine portrait professional serious looking at camera white coat stethoscope grey hair beard caucasian one person indoors corridor blurred background warm lighting depth of field focus on subject realism photographic high quality 50mm lens f/2.8 aperture 1/125 second shutter speed ISO 100 natural light window light soft light ambient light tungsten light fluorescent light LED light mixed lighting artificial light natural light studio lighting on-location lighting lighting equipment lighting techniques lighting effects