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Nikon DSLR Cameras
Out of Production DSLRs
D300/D300s
D300 pop up flash with D glass
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<blockquote data-quote="WayneF" data-source="post: 362875" data-attributes="member: 12496"><p>Actually, it is quite easy to see bad effect to flash due to D lenses (speaking also of later lenses, G and AF-S, etc. which do the D thing too). The distance reported by the D lens (seen in the Exif) for zoom lenses is particularly bad. It only affects direct flash. When the lens error reports less distance than the actual flash distance, the system says "Wow, the level the TTL BL flash measured to use is too much power for this (incorrect) close distance, and so it cuts back on the flash power, imagining it protects against overexposure, but which causes underexposure then.</p><p></p><p>My 16-85mm Nikon lens at a measured 3 meters (10 feet) reports 2 meters at 16mm and 3.6 meters at 85mm. 3.6 is fine, greater than the flash measures, so it does not reduce the flash. But 16 mm reporting 2 meters does.</p><p></p><p>My 12-24mm Nikon lens at a measured 3 meters reports 2 meters at 12mm and reports infinity at 24mm. Infinity is no problem, but 2 meters cuts back on the flash power.</p><p></p><p>My 24-70mm Nikon lens at a measured 3 meters reports 2.5 meters at both 24 and 70mm. Cuts back on the flash power (a little).</p><p></p><p>My macro primes are reasonably correct. My 70-200 lens generally reports greater distance, so no problem. But no bets on most zooms.</p><p></p><p>This only affects TTL BL Direct flash. Not TTL mode, not bounce, etc. But the D lens system is a bit underwhelming. <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>There is more about this at <a href="http://www.scantips.com/lights/ttlbl-d.html" target="_blank">Nikon TTL BL flash - D-lens distance data accuracy</a></p><p></p><p>Workarounds are:</p><p></p><p>To disable the D-lens distance check (because it often interferes with direct TTL BL flash): </p><p></p><p></p><ul> <li data-xf-list-type="ul">Selecting TTL mode (as opposed to TTL BL mode) will disable the D-lens distance check. Some flashes have this menu. </li> <li data-xf-list-type="ul">Choosing Spot Metering will switch the TTL BL flash metering to be TTL mode. The flash system does not use Spot metering, and if the ambient is too dim to register much, Spot won't matter much to it either, but Spot metering does switch flash modes (Just don't forget to reset it when you go back into bright ambient.) </li> <li data-xf-list-type="ul">If your camera model has the FV Lock function, it does not use the D-lens distance data, so its use can ignore this problem too. </li> <li data-xf-list-type="ul">Tilting or rotating the Nikon flash head (for bounce) switches out D-lens distance support. The bounce path is assumed to be a different distance. </li> <li data-xf-list-type="ul">I also have a Yongnuo YN565EX flash, and the Nikon system also defaults to TTL BL with it, but it does not suffer this problem, it causes system to ignore D lens. Probably third party flashes do not report head tilt? </li> </ul></blockquote><p></p>
[QUOTE="WayneF, post: 362875, member: 12496"] Actually, it is quite easy to see bad effect to flash due to D lenses (speaking also of later lenses, G and AF-S, etc. which do the D thing too). The distance reported by the D lens (seen in the Exif) for zoom lenses is particularly bad. It only affects direct flash. When the lens error reports less distance than the actual flash distance, the system says "Wow, the level the TTL BL flash measured to use is too much power for this (incorrect) close distance, and so it cuts back on the flash power, imagining it protects against overexposure, but which causes underexposure then. My 16-85mm Nikon lens at a measured 3 meters (10 feet) reports 2 meters at 16mm and 3.6 meters at 85mm. 3.6 is fine, greater than the flash measures, so it does not reduce the flash. But 16 mm reporting 2 meters does. My 12-24mm Nikon lens at a measured 3 meters reports 2 meters at 12mm and reports infinity at 24mm. Infinity is no problem, but 2 meters cuts back on the flash power. My 24-70mm Nikon lens at a measured 3 meters reports 2.5 meters at both 24 and 70mm. Cuts back on the flash power (a little). My macro primes are reasonably correct. My 70-200 lens generally reports greater distance, so no problem. But no bets on most zooms. This only affects TTL BL Direct flash. Not TTL mode, not bounce, etc. But the D lens system is a bit underwhelming. :) There is more about this at [url=http://www.scantips.com/lights/ttlbl-d.html]Nikon TTL BL flash - D-lens distance data accuracy[/url] Workarounds are: To disable the D-lens distance check (because it often interferes with direct TTL BL flash): [LIST] [*]Selecting TTL mode (as opposed to TTL BL mode) will disable the D-lens distance check. Some flashes have this menu. [*]Choosing Spot Metering will switch the TTL BL flash metering to be TTL mode. The flash system does not use Spot metering, and if the ambient is too dim to register much, Spot won't matter much to it either, but Spot metering does switch flash modes (Just don't forget to reset it when you go back into bright ambient.) [*]If your camera model has the FV Lock function, it does not use the D-lens distance data, so its use can ignore this problem too. [*]Tilting or rotating the Nikon flash head (for bounce) switches out D-lens distance support. The bounce path is assumed to be a different distance. [*]I also have a Yongnuo YN565EX flash, and the Nikon system also defaults to TTL BL with it, but it does not suffer this problem, it causes system to ignore D lens. Probably third party flashes do not report head tilt? [/LIST] [/QUOTE]
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Nikon DSLR Cameras
Out of Production DSLRs
D300/D300s
D300 pop up flash with D glass
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