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<p>[QUOTE=&quot;rmpsrpms, post: 4070112, member: 31773&quot;]Let me explain the EV reasoning...</p><p><br /></p><p>But first...I recommend using AV mode (Aperture Priority) for coins. This works well for lenses with electronically-adjustable aperture in that it fixes the aperture at a particular value, thus depth of field and diffraction are held constant. For manual lenses, it simply tells the camera that the lens is to be ignored. </p><p><br /></p><p>In Av mode, the camera will adjust the shutter speed to push the metered highlights into saturation. This is not desirable for coins since they generally have shiny surfaces that give specular reflections to the incident light. It&#039;s best to keep these reflections to a minimum, and if they exist, to push their exposure down such that they are not saturating the sensor. </p><p><br /></p><p>This is where EV comes in. By setting EV to a negative value, the overall exposure time is reduced, and if you reduce it enough, the specular highlights will maintain true color rather than looking bright white.[/QUOTE]</p><p><br /></p>

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