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<blockquote data-quote="WayneF" data-source="post: 270252" data-attributes="member: 12496">That is sounding possible, at least imaginably possible.&nbsp; &nbsp;Digital TTL works by first triggering a low level preflash.&nbsp; The camera meters that preflash and determines a proper level to program for the final flash.&nbsp; Then it opens the shutter and fires the final flash at working level.So the preflash also triggers the slave flash (it simply triggers at any flash it sees).&nbsp; &nbsp;&nbsp; So since it flashes when the Sunpak preflash occurs, it cannot influence the final flash.&nbsp; &nbsp; But the camera meters that combination of the two, and says &quot;Wow!&nbsp; That was some preflash&quot;, and greatly reduces the flash it would have otherwise programmed.I have never seen that effect occur, normally the slave simply does not register in the picture.&nbsp; &nbsp; But I have not spent much time false triggering a slave.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp; But why couldn't it happen?&nbsp; The camera does meter the preflash and set a corresponding final flash level.Oh yes, there are some, and I think the PZ30X is one.&nbsp; There are inexpensive flashes that only do manual mode.&nbsp; There are even less expensive models that only do TTL... $50 class. They don't even have to provide a display and menu and buttons to set a manual power level.&nbsp; The camera does all the TTL work.The PZ30X has buttons to program a flash compensation, a +/- EV difference from what the camera meters that it should do.&nbsp; But that is not Manual flash.</blockquote>

[QUOTE="WayneF, post: 270252, member: 12496"] That is sounding possible, at least imaginably possible. Digital TTL works by first triggering a low level preflash. The camera meters that preflash and determines a proper level to program for the final flash. Then it opens the shutter and fires the final flash at working level. So the preflash also triggers the slave flash (it simply triggers at any flash it sees). So since it flashes when the Sunpak preflash occurs, it cannot influence the final flash. But the camera meters that combination of the two, and says "Wow! That was some preflash", and greatly reduces the flash it would have otherwise programmed. I have never seen that effect occur, normally the slave simply does not register in the picture. But I have not spent much time false triggering a slave. :) But why couldn't it happen? The camera does meter the preflash and set a corresponding final flash level. Oh yes, there are some, and I think the PZ30X is one. There are inexpensive flashes that only do manual mode. There are even less expensive models that only do TTL... $50 class. They don't even have to provide a display and menu and buttons to set a manual power level. The camera does all the TTL work. The PZ30X has buttons to program a flash compensation, a +/- EV difference from what the camera meters that it should do. But that is not Manual flash. [/QUOTE]

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