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Nikon DSLR Cameras
D750
how your auto iso and flash works ?
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<blockquote data-quote="WayneF" data-source="post: 556897" data-attributes="member: 12496"><p>For flash fill in bright sun, I would say -1.7 or -2 EV flash compensation for TTL mode (<strong>as opposed to default TTL BL mode</strong>). </p><p></p><p>Note however that the Nikon flash system default is TTL BL, which does automatic flash compensation, normally around -2 EV in bright sun (much less in dimmer scenes). It is automatic, and does not show this -2 number anywhere, but that's what the result will do with default TTL BL flash in bright sun. Things we need to know... So if you do -2 and it does -2, that will be -4 which you may not like. Wouldn't be any flash illumination left. <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>I have a page about this, at <a href="http://www.scantips.com/lights/flashbasics4.html" target="_blank">Flash pictures are Double Exposures- Outdoors</a></p><p></p><p>A few older flash models, and the SB-910 flash, have a menu to select TTL or TTL BL. Nikon gave that up, and the SB-500 or SB-700 or the Yongnuo flashes do not have that menu, they just say "TTL" which means whatever the system metering does. The Nikon system will default to TTL BL (meaning, automatic flash fill compensation). In which case, your 0 EV flash compensation may be the correct number (which will still be about -2 EV result if TTL BL in bright sun). I suppose Nikon is proud of their "balanced" flash system, but it is just automation, point&shoot, offers less control to the photographer. Manual flash mode is still very popular though.</p><p></p><p> Spot metering mode will force TTL mode (which is Not default TTL BL, TTL has no automatic fill compensation). Spot metering with flash works great indoors, but Spot metering is a whole new thing in outdoor lighting. Spot meters the ambient, which is generally insignificant level indoors if using flash, but Spot has a large effect outdoors, better know how to use Spot metering then.</p><p></p><p> <strong>Spot metering does not otherwise apply to flash</strong>, flash always does a central metering (but Spot does force TTL BL off, and TTL mode on).</p><p></p><p></p><p></p><p></p><p></p><p>When I suggested -2 EV FC might be a bit much, you had said umbrella, and did not say Sun, and I assumed indoors, with an umbrella as main light, which is different than bright sun being main light. I'm having trouble pinning down the specific situation we discuss. <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>At least bright sun and flash generally about agree about white balance, close to the same, not very mixed lighting.</p><p></p><p>My complaint with high ISO indoors with flash is that it brings the ambient up to be fully exposed, which then shows the orange color of incandescent lights, or maybe green of fluoresents. Whatever, it normally becomes very mixed lighting sources, probably very incompatible with flash white balance. Portrait situations carefully control the light much better than that. Typically ISO 100 and maybe f/8 and maximum sync speed shutter, which in indoor ambient, without triggering the flash, is a totally black picture (no light, so no orange). Then the flash is setup to provide the pristine lighting desired.</p><p></p><p>You also said f/1.8 once, which to me, is simply not the way I would ever work for formal portraits. Poor in a few ways, but if you are using ISO 3200 and f/1.8 and intending to mix with fill flash, you will want to add filters to the flash to match the ambient white balance. CTO filters (Color Temperature Orange) to match incandescent. However, there are degrees of CTO shading. It is not an easy solution to get right, especially since every situation is likely different.</p><p></p><p>Shut out the incandescent, and use only flash, and you have a stable environment that you can control. Just one notion... Others have different ideas of course (and enjoy the challenges), but I just like sharp pictures, with depth of field, and proper lighting. f/1.8 and ISO 3200 are not on that road.</p></blockquote><p></p>
[QUOTE="WayneF, post: 556897, member: 12496"] For flash fill in bright sun, I would say -1.7 or -2 EV flash compensation for TTL mode ([B]as opposed to default TTL BL mode[/B]). Note however that the Nikon flash system default is TTL BL, which does automatic flash compensation, normally around -2 EV in bright sun (much less in dimmer scenes). It is automatic, and does not show this -2 number anywhere, but that's what the result will do with default TTL BL flash in bright sun. Things we need to know... So if you do -2 and it does -2, that will be -4 which you may not like. Wouldn't be any flash illumination left. :) I have a page about this, at [URL="http://www.scantips.com/lights/flashbasics4.html"]Flash pictures are Double Exposures- Outdoors[/URL] A few older flash models, and the SB-910 flash, have a menu to select TTL or TTL BL. Nikon gave that up, and the SB-500 or SB-700 or the Yongnuo flashes do not have that menu, they just say "TTL" which means whatever the system metering does. The Nikon system will default to TTL BL (meaning, automatic flash fill compensation). In which case, your 0 EV flash compensation may be the correct number (which will still be about -2 EV result if TTL BL in bright sun). I suppose Nikon is proud of their "balanced" flash system, but it is just automation, point&shoot, offers less control to the photographer. Manual flash mode is still very popular though. Spot metering mode will force TTL mode (which is Not default TTL BL, TTL has no automatic fill compensation). Spot metering with flash works great indoors, but Spot metering is a whole new thing in outdoor lighting. Spot meters the ambient, which is generally insignificant level indoors if using flash, but Spot has a large effect outdoors, better know how to use Spot metering then. [B]Spot metering does not otherwise apply to flash[/B], flash always does a central metering (but Spot does force TTL BL off, and TTL mode on). When I suggested -2 EV FC might be a bit much, you had said umbrella, and did not say Sun, and I assumed indoors, with an umbrella as main light, which is different than bright sun being main light. I'm having trouble pinning down the specific situation we discuss. :) At least bright sun and flash generally about agree about white balance, close to the same, not very mixed lighting. My complaint with high ISO indoors with flash is that it brings the ambient up to be fully exposed, which then shows the orange color of incandescent lights, or maybe green of fluoresents. Whatever, it normally becomes very mixed lighting sources, probably very incompatible with flash white balance. Portrait situations carefully control the light much better than that. Typically ISO 100 and maybe f/8 and maximum sync speed shutter, which in indoor ambient, without triggering the flash, is a totally black picture (no light, so no orange). Then the flash is setup to provide the pristine lighting desired. You also said f/1.8 once, which to me, is simply not the way I would ever work for formal portraits. Poor in a few ways, but if you are using ISO 3200 and f/1.8 and intending to mix with fill flash, you will want to add filters to the flash to match the ambient white balance. CTO filters (Color Temperature Orange) to match incandescent. However, there are degrees of CTO shading. It is not an easy solution to get right, especially since every situation is likely different. Shut out the incandescent, and use only flash, and you have a stable environment that you can control. Just one notion... Others have different ideas of course (and enjoy the challenges), but I just like sharp pictures, with depth of field, and proper lighting. f/1.8 and ISO 3200 are not on that road. [/QUOTE]
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D750
how your auto iso and flash works ?
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