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<blockquote data-quote="WayneF" data-source="post: 217315" data-attributes="member: 12496">Sure, it fires, a paper clip will fire it, but it is not metered or programmed TTL.&nbsp; There is so much more to it than &quot;firing&quot;.&nbsp;&nbsp; I think you are seeing &quot;firing&quot;, but missing all the rest.No flash &quot;does TTL work&quot;.&nbsp;&nbsp; TTL means Through the Lens metering.&nbsp; The camera meters the TTL preflash, and decides everything. Then the camera communication programs the TTL flash with the appropriate TTL power level for that next flash. A TTL flash simply follows communicated orders.&nbsp; &nbsp; There is no means to do this on that trigger.&nbsp; You don't even have a TTL preflash.&nbsp;&nbsp; And for another example, that trigger also works with PC cord connection.&nbsp; PC cord is one wire, and is limited to manual flash by definition.&nbsp; There is no significance of bounce flash, the TTL preflash is still metered, so that the flash TTL power level can be programmed.&nbsp; I mentioned bounce because bounce normally requires lots of power (2 or 3 stops more, 4 or 8 times more power), where direct flash is normally low power.&nbsp;&nbsp; So both cases are two widely different power levels, which TTL can meter and program, but your &quot;setup&quot; cannot.&nbsp; You might halfway luck out with one case, but you&nbsp; cannot get two correct exposures with bounce and direct in the same place.&nbsp;&nbsp; If you want to show pictures as evidence, those pictures should be near distance vs far distance, or bounce vs direct, or umbrella vs direct, etc, but different cases obviously requiring metering TTL to set different power levels -&nbsp; which TTL can handle, but your &quot;setup&quot; cannot.&nbsp;&nbsp; You might include cases showing that camera Flash Compensation can control the TTL level.&nbsp; Yours can do none of that.&nbsp; But if you think so, at least show some correct exposures in widely different power situations. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp;&nbsp; Other evidence of course would be to show advertising specs from Yongnuo advising the trigger can relay TTL. They apparently are unaware that they did all the work to design that in.&nbsp; To fire it is just one shorted wire signal, on or off.&nbsp; But to request TTL preflash, and then to program numeric power level, and then fire it, is communication very vastly more.&nbsp; The specs&nbsp; and manual certainly would mention that.Sorry, I did not imply lying.&nbsp;&nbsp; I think you just didn't know and are mistaken. The worry is if you repeat it often publicly here, some poor sole might believe it, and buy something that cannot deliver what was promised.&nbsp; Bad things do need correction.A TTL flash surely does have some unprogrammed power level.&nbsp; &nbsp;&nbsp; For example, in the case of the Test button on the flash, press it and it also fires.&nbsp; But TTL power is also unprogrammed then.&nbsp; &nbsp;&nbsp; Nikon TTL flashes simply do 1/16 power at the Test button (because there is no programmed TTL level).&nbsp; &nbsp; I don't know your specific case, but you are seeing something like that.&nbsp; If it is something like 1/16 power, you might even luck out at some average direct flash that way, and confuse yourself to false conclusions (but any accuracy would obviously be very crude).&nbsp; There is greatly more to it than just &quot;firing&quot;.&nbsp; Show us some of that.So I am suggesting to convince yourself by trying obviously different situations needing different power level, so you can see it obviously fails then.&nbsp; That is the purpose of TTL, and your triggers cannot do it.</blockquote>

[QUOTE="WayneF, post: 217315, member: 12496"] Sure, it fires, a paper clip will fire it, but it is not metered or programmed TTL. There is so much more to it than "firing". I think you are seeing "firing", but missing all the rest. No flash "does TTL work". TTL means Through the Lens metering. The camera meters the TTL preflash, and decides everything. Then the camera communication programs the TTL flash with the appropriate TTL power level for that next flash. A TTL flash simply follows communicated orders. There is no means to do this on that trigger. You don't even have a TTL preflash. And for another example, that trigger also works with PC cord connection. PC cord is one wire, and is limited to manual flash by definition. There is no significance of bounce flash, the TTL preflash is still metered, so that the flash TTL power level can be programmed. I mentioned bounce because bounce normally requires lots of power (2 or 3 stops more, 4 or 8 times more power), where direct flash is normally low power. So both cases are two widely different power levels, which TTL can meter and program, but your "setup" cannot. You might halfway luck out with one case, but you cannot get two correct exposures with bounce and direct in the same place. If you want to show pictures as evidence, those pictures should be near distance vs far distance, or bounce vs direct, or umbrella vs direct, etc, but different cases obviously requiring metering TTL to set different power levels - which TTL can handle, but your "setup" cannot. You might include cases showing that camera Flash Compensation can control the TTL level. Yours can do none of that. But if you think so, at least show some correct exposures in widely different power situations. :) Other evidence of course would be to show advertising specs from Yongnuo advising the trigger can relay TTL. They apparently are unaware that they did all the work to design that in. To fire it is just one shorted wire signal, on or off. But to request TTL preflash, and then to program numeric power level, and then fire it, is communication very vastly more. The specs and manual certainly would mention that. Sorry, I did not imply lying. I think you just didn't know and are mistaken. The worry is if you repeat it often publicly here, some poor sole might believe it, and buy something that cannot deliver what was promised. Bad things do need correction. A TTL flash surely does have some unprogrammed power level. For example, in the case of the Test button on the flash, press it and it also fires. But TTL power is also unprogrammed then. Nikon TTL flashes simply do 1/16 power at the Test button (because there is no programmed TTL level). I don't know your specific case, but you are seeing something like that. If it is something like 1/16 power, you might even luck out at some average direct flash that way, and confuse yourself to false conclusions (but any accuracy would obviously be very crude). There is greatly more to it than just "firing". Show us some of that. So I am suggesting to convince yourself by trying obviously different situations needing different power level, so you can see it obviously fails then. That is the purpose of TTL, and your triggers cannot do it. [/QUOTE]

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