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Nikon DSLR Cameras
D7100
EV values in display?
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<blockquote data-quote="WayneF" data-source="post: 308713" data-attributes="member: 12496"><p>We can both be right if we go at it right... at least enough to agree about the obvious facts. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p></p><p>The first line of Wikipedia says about EV:</p><p></p><p>"In <a href="http://en.wikipedia.org/wiki/Photography" target="_blank">photography</a>, <strong>exposure value</strong> (<strong>EV</strong>) is a number that represents a combination of a <a href="http://en.wikipedia.org/wiki/Camera" target="_blank">camera</a>'s <a href="http://en.wikipedia.org/wiki/Shutter_speed" target="_blank">shutter speed</a> and <a href="http://en.wikipedia.org/wiki/F-number" target="_blank">f-number</a>, such that all combinations that yield the same <a href="http://en.wikipedia.org/wiki/Exposure_%28photography%29" target="_blank">exposure</a> have the same EV value (for any fixed scene <a href="http://en.wikipedia.org/wiki/Luminance" target="_blank">luminance</a>)."</p><p></p><p>So it is about the numerical combinations. There is no mention of ISO or of light value. Technically, "for ANY fixed scene" means "independent of luminance". Whatever the luminance is, the EV value is about the combination of numbers, as said.</p><p></p><p> So this means (from the chart): f/16 at 1/125 second is EV 15. ISO and/or proper exposure is NOT a factor. f/16 at 1/125 is EV 15. Period.</p><p></p><p>We do think of this as being about the correct exposure in bright sun (Sunny 16), except the EV table does not mention the light or the ISO.</p><p></p><p>If we expose at ISO 100 and get a proper exposure in the sun, then great, but f/16 1/125 second is still EV 15.</p><p></p><p>If we expose same at ISO 800 and get three stops overexposure, so be it, but f/16 1/125 second is still EV 15, which is not about the light or the proper exposure.</p><p></p><p>But, if then we know (by some other way) to increase shutter speed 3 stops to 1/1000 second, maybe we get a proper exposure again.</p><p>But we have a different combination of numbers now, and now we have to say that f/16 1/1000 second is EV 18 (from the chart. proper exposure or not).</p><p></p><p>Again, the EV chart did NOT advise us about the sunlight or ISO 100, it only shows shutter/aperture combinations in rows of equivalent exposures... not necessarily proper exposures of anything, not about any ISO, just columns of combinations of numbers that give the SAME exposure (equivalents, good, bad, or indifferent exposure). And concerned with steps in stops (rows of chart). Which was kinda of a big deal back in its day... aperture numbering systems other than f/stops were common until up in the 1920s.</p><p></p><p>The EV chart, and the concept of it, is about the numerical camera settings, only about shutter speed and fstop.</p><p></p><p></p><p>Now I will switch and argue for your side:</p><p></p><p></p><p>But... later on (after the chart), light meters came into use, and we found light meters could be calibrated in EV.</p><p></p><p>If the light reads a certain level, we could calibrate the meter and call it EV 15, and then the meter (not the chart, but the meter) told us proper exposure to match that reading. For any ISO, it tells us something. From the chart, if we knew EV 15, then we could derive the proper number combinations matching EV 15. Simply because the meter chose this scheme, to use the EV chart. The chart just tells us combinations for EV 15.</p><p></p><p>However, it was more useful and straight forward if the meter simply told us the numerical combinations to use, so mostly they do.</p><p></p><p>Sekonic meters have a special mode where they will read and display EV. They also have an ISO setting that cannot be ignored (it is after all a light meter). And for the current ISO setting, it does give an EV result from the light. And if we change ISO (in the same light), we get a different EV. So the Sekonic mode is NOT independent of ISO, but neither does it show the same information that any EV chart shows (which is independent). Simply not the same concept. This part is about light meters, and the first section above is about EV charts. The meter usage might suggest ISO was a factor of EV (Their way - concerned with ISO and exposure), but the EV chart does not suggest anything of the sort (concerned with equivalent combinations). <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p> You are arguing one way, about meters, and me the other, about charts, but we could simply both agree that both aspects exist. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="WayneF, post: 308713, member: 12496"] We can both be right if we go at it right... at least enough to agree about the obvious facts. :) The first line of Wikipedia says about EV: "In [URL="http://en.wikipedia.org/wiki/Photography"]photography[/URL], [B]exposure value[/B] ([B]EV[/B]) is a number that represents a combination of a [URL="http://en.wikipedia.org/wiki/Camera"]camera[/URL]'s [URL="http://en.wikipedia.org/wiki/Shutter_speed"]shutter speed[/URL] and [URL="http://en.wikipedia.org/wiki/F-number"]f-number[/URL], such that all combinations that yield the same [URL="http://en.wikipedia.org/wiki/Exposure_%28photography%29"]exposure[/URL] have the same EV value (for any fixed scene [URL="http://en.wikipedia.org/wiki/Luminance"]luminance[/URL])." So it is about the numerical combinations. There is no mention of ISO or of light value. Technically, "for ANY fixed scene" means "independent of luminance". Whatever the luminance is, the EV value is about the combination of numbers, as said. So this means (from the chart): f/16 at 1/125 second is EV 15. ISO and/or proper exposure is NOT a factor. f/16 at 1/125 is EV 15. Period. We do think of this as being about the correct exposure in bright sun (Sunny 16), except the EV table does not mention the light or the ISO. If we expose at ISO 100 and get a proper exposure in the sun, then great, but f/16 1/125 second is still EV 15. If we expose same at ISO 800 and get three stops overexposure, so be it, but f/16 1/125 second is still EV 15, which is not about the light or the proper exposure. But, if then we know (by some other way) to increase shutter speed 3 stops to 1/1000 second, maybe we get a proper exposure again. But we have a different combination of numbers now, and now we have to say that f/16 1/1000 second is EV 18 (from the chart. proper exposure or not). Again, the EV chart did NOT advise us about the sunlight or ISO 100, it only shows shutter/aperture combinations in rows of equivalent exposures... not necessarily proper exposures of anything, not about any ISO, just columns of combinations of numbers that give the SAME exposure (equivalents, good, bad, or indifferent exposure). And concerned with steps in stops (rows of chart). Which was kinda of a big deal back in its day... aperture numbering systems other than f/stops were common until up in the 1920s. The EV chart, and the concept of it, is about the numerical camera settings, only about shutter speed and fstop. Now I will switch and argue for your side: But... later on (after the chart), light meters came into use, and we found light meters could be calibrated in EV. If the light reads a certain level, we could calibrate the meter and call it EV 15, and then the meter (not the chart, but the meter) told us proper exposure to match that reading. For any ISO, it tells us something. From the chart, if we knew EV 15, then we could derive the proper number combinations matching EV 15. Simply because the meter chose this scheme, to use the EV chart. The chart just tells us combinations for EV 15. However, it was more useful and straight forward if the meter simply told us the numerical combinations to use, so mostly they do. Sekonic meters have a special mode where they will read and display EV. They also have an ISO setting that cannot be ignored (it is after all a light meter). And for the current ISO setting, it does give an EV result from the light. And if we change ISO (in the same light), we get a different EV. So the Sekonic mode is NOT independent of ISO, but neither does it show the same information that any EV chart shows (which is independent). Simply not the same concept. This part is about light meters, and the first section above is about EV charts. The meter usage might suggest ISO was a factor of EV (Their way - concerned with ISO and exposure), but the EV chart does not suggest anything of the sort (concerned with equivalent combinations). :) You are arguing one way, about meters, and me the other, about charts, but we could simply both agree that both aspects exist. :) [/QUOTE]
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