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<blockquote data-quote="Eyelight" data-source="post: 394682" data-attributes="member: 24753"><p>There is a very slight off target in the OP related to the use of EV. </p><p></p><p>EV is derived by a calculation that does not consider ISO or lighting . It is used to compare camera settings independent of actual light or film ISO (or digital sensor ISO sensitivity). So, aperture/shutter combinations that yield the same EV will yield the same exposure at the same ISO, but EV does not carry up or down ISO sensitivity. An EV of 15 would only be appropriate for bright sun at ISO 100.</p><p></p><p></p><p></p><p>1/2000 @ f/5.6 yields an EV of 16</p><p>1/500 @ f/8 yields an EV of 15</p><p></p><p>These EV values will always be the same whether at ISO 100, 200, 400, etc. And what this tells us is that the two combinations are 1 stop apart. Easier to see here because the shutter speed is 2 stops difference (double-double) and the aperture is only 1 (half).</p><p></p><p>Just remember EV is about shutter/aperture combinations. EV15, for instance, represents a series of equivalent combinations <strong>and</strong> <strong>only</strong> at ISO 100, all these combinations would yield an exposure appropriate for the proverbial Sunny 16 daylight shot. If you changed the ISO to 200 your EV (aperture/shutter combinations) would change to EV16 to yield the same Sunny 16 exposure. If you changed to ISO 800, your EV would change to EV18 (3 stops from EV15) to yield the same Sunny 16 exposure.</p></blockquote><p></p>
[QUOTE="Eyelight, post: 394682, member: 24753"] There is a very slight off target in the OP related to the use of EV. EV is derived by a calculation that does not consider ISO or lighting . It is used to compare camera settings independent of actual light or film ISO (or digital sensor ISO sensitivity). So, aperture/shutter combinations that yield the same EV will yield the same exposure at the same ISO, but EV does not carry up or down ISO sensitivity. An EV of 15 would only be appropriate for bright sun at ISO 100. 1/2000 @ f/5.6 yields an EV of 16 1/500 @ f/8 yields an EV of 15 These EV values will always be the same whether at ISO 100, 200, 400, etc. And what this tells us is that the two combinations are 1 stop apart. Easier to see here because the shutter speed is 2 stops difference (double-double) and the aperture is only 1 (half). Just remember EV is about shutter/aperture combinations. EV15, for instance, represents a series of equivalent combinations [B]and[/B] [B]only[/B] at ISO 100, all these combinations would yield an exposure appropriate for the proverbial Sunny 16 daylight shot. If you changed the ISO to 200 your EV (aperture/shutter combinations) would change to EV16 to yield the same Sunny 16 exposure. If you changed to ISO 800, your EV would change to EV18 (3 stops from EV15) to yield the same Sunny 16 exposure. [/QUOTE]
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