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Nikon DSLR Cameras
D750
Auto mode with EC -1 and FEC at -1
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<blockquote data-quote="WayneF" data-source="post: 580401" data-attributes="member: 12496"><p>The normal Nikon procedure for Exposure Compensation has always been that EC affects both ambient and flash. So if you set EC to -1 EV, flash and ambient are both -1 EV. EC is added to FC, however we do NOT see the sum in the menus (the Exif data will show the sum afterwards). And we can set EC -1 and FC +1 to give what we think of as EC -1 and FC 0 EV.</p><p></p><p>However, for the D750, you can forget that. Because some later models, including the D750 add a new E4 menu which will interest you. This provides for separating EC and FC, so that EC only affects ambient, but not flash. The E4 description in the manual uses the word Background to mean Ambient.</p><p></p><p>The 1/60 second with flash in A mode is menu E2, the Minimum Shutter Speed with flash (in modes A or P).</p><p>It can be faster in bright light, for example in bright sun, it will be as metered, much higher, perhaps 1/250 second (menu E1, which also can have other HSS effects). But indoors, the ambient meters very dim, and if you turned the flash off to see it, perhaps it might say maybe 1/4 second (just for example, in your indoor situation). But if using flash, system doesn't think you need to be bothered with 1/4 second, so it sets the Minimum Shutter Speed with Flash, which default and E2 maximum is 1/60 second. Shutter will be at least that fast with flash. If you see 1/60, the ambient probably actually metered slower.</p><p></p><p>Now if the ambient without flash does meter 1/4 second, this 1/60 Minimum is 4 stops underexposure of ambient. But no matter, if you are using flash instead. If for some reason you wanted to use the 1/4 second actually metered, use Slow Sync (or Rear Curtain Sync), and they will do that.</p><p></p><p>Flash compensation will adjust the TTL flash output, but it has very little meaning as fill ratio if the ambient is already 4 stops down.</p><p></p><p>The flash exposure is NOT AFFECTED by shutter speed, so the TTL flash exposure will be the same in A mode 1/60, or M mode 1/250 second. Assuming the 1/4 second that I made up, at 1/250, the ambient will be underexposed 2 more stops (than would 1/60), but it is already pretty black at 1/60, so it really doesn't matter. It might be a consideration in a brighter ambient that actually registers some light (which is probably outdoors).</p><p></p><p>Using M mode with flash indoors is very common practice. It offers choice of shutter speed for ambient. TTL flash is still automatic even in camera M mode, and the flash exposure is not affected by shutter speed. Indoors (insignficant ambient) TTL will allow you to shoot fast (if the flash is able to recycle fast enough). Also S mode allows setting other shutter speeds, but a) indoors likely is always maximum aperture in S mode and b) flash is not affected by shutter speed, so M mode seems preferable.</p><p></p><p>Ambient is affected by shutter speed, so therefore Manual and Shutter Speed is a useful tool to control the ratio of ambient to flash. Shutter affects ambient, but not flash. Yoiu can choose shutter speed to allow more ambient in, or to keep more out.</p></blockquote><p></p>
[QUOTE="WayneF, post: 580401, member: 12496"] The normal Nikon procedure for Exposure Compensation has always been that EC affects both ambient and flash. So if you set EC to -1 EV, flash and ambient are both -1 EV. EC is added to FC, however we do NOT see the sum in the menus (the Exif data will show the sum afterwards). And we can set EC -1 and FC +1 to give what we think of as EC -1 and FC 0 EV. However, for the D750, you can forget that. Because some later models, including the D750 add a new E4 menu which will interest you. This provides for separating EC and FC, so that EC only affects ambient, but not flash. The E4 description in the manual uses the word Background to mean Ambient. The 1/60 second with flash in A mode is menu E2, the Minimum Shutter Speed with flash (in modes A or P). It can be faster in bright light, for example in bright sun, it will be as metered, much higher, perhaps 1/250 second (menu E1, which also can have other HSS effects). But indoors, the ambient meters very dim, and if you turned the flash off to see it, perhaps it might say maybe 1/4 second (just for example, in your indoor situation). But if using flash, system doesn't think you need to be bothered with 1/4 second, so it sets the Minimum Shutter Speed with Flash, which default and E2 maximum is 1/60 second. Shutter will be at least that fast with flash. If you see 1/60, the ambient probably actually metered slower. Now if the ambient without flash does meter 1/4 second, this 1/60 Minimum is 4 stops underexposure of ambient. But no matter, if you are using flash instead. If for some reason you wanted to use the 1/4 second actually metered, use Slow Sync (or Rear Curtain Sync), and they will do that. Flash compensation will adjust the TTL flash output, but it has very little meaning as fill ratio if the ambient is already 4 stops down. The flash exposure is NOT AFFECTED by shutter speed, so the TTL flash exposure will be the same in A mode 1/60, or M mode 1/250 second. Assuming the 1/4 second that I made up, at 1/250, the ambient will be underexposed 2 more stops (than would 1/60), but it is already pretty black at 1/60, so it really doesn't matter. It might be a consideration in a brighter ambient that actually registers some light (which is probably outdoors). Using M mode with flash indoors is very common practice. It offers choice of shutter speed for ambient. TTL flash is still automatic even in camera M mode, and the flash exposure is not affected by shutter speed. Indoors (insignficant ambient) TTL will allow you to shoot fast (if the flash is able to recycle fast enough). Also S mode allows setting other shutter speeds, but a) indoors likely is always maximum aperture in S mode and b) flash is not affected by shutter speed, so M mode seems preferable. Ambient is affected by shutter speed, so therefore Manual and Shutter Speed is a useful tool to control the ratio of ambient to flash. Shutter affects ambient, but not flash. Yoiu can choose shutter speed to allow more ambient in, or to keep more out. [/QUOTE]
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Nikon DSLR Cameras
D750
Auto mode with EC -1 and FEC at -1
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