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<blockquote data-quote="WayneF" data-source="post: 252837" data-attributes="member: 12496">Again?&nbsp; Don't confuse everyone.&nbsp;&nbsp; No, cannot possibly be right.&nbsp; Said again more plainly, there is absolutely no way in hell the flash can do TTL on a simple radio trigger.&nbsp; Radio trigger requires flash Manual mode. (yes, there are expensive alternatives which are different, but the 603 is not among them).TTL requires communication between camera and flash, first to request TTL preflash, to meter preflash, and to set the power level of the TTL flash unit, and then trigger it.&nbsp; Only the hot shoe (one flash) and commander (a couple of flashes) can do this.&nbsp;&nbsp; The radio trigger uses a single wire communication (PC sync or hot shoe center pin), and this TTL job cannot be done without the full communication.TTL mode will trigger from the single pin, but not at a metered power level.&nbsp; I'd guess probably always at 1/16&nbsp; power, same as the Test Button in TTL mode (because the proper TTL level is simply not metered then).So again, before you tell us this stuff, do verify&nbsp; your &quot;TTL&quot; with multlple tries at different levels, requiring minimum power and maximum power, to verify it does it.&nbsp; I think it only does one middle power, always, without any control, which is NOT TTL.Another method to make you believe it.&nbsp; Set Rear Curtain sync with a long shutter speed, at least one second.TTL flash on the hot shoe will flash twice, the TTL preflash just before the shutter opens, and the final TTL flash at the end of the shutter duration.&nbsp; This method allows you to see and differentiate these.Your false TTL assertion will only flash once at the end of the shutter duration, no TTL preflash.</blockquote>

[QUOTE="WayneF, post: 252837, member: 12496"] Again? Don't confuse everyone. No, cannot possibly be right. Said again more plainly, there is absolutely no way in hell the flash can do TTL on a simple radio trigger. Radio trigger requires flash Manual mode. (yes, there are expensive alternatives which are different, but the 603 is not among them). TTL requires communication between camera and flash, first to request TTL preflash, to meter preflash, and to set the power level of the TTL flash unit, and then trigger it. Only the hot shoe (one flash) and commander (a couple of flashes) can do this. The radio trigger uses a single wire communication (PC sync or hot shoe center pin), and this TTL job cannot be done without the full communication. TTL mode will trigger from the single pin, but not at a metered power level. I'd guess probably always at 1/16 power, same as the Test Button in TTL mode (because the proper TTL level is simply not metered then). So again, before you tell us this stuff, do verify your "TTL" with multlple tries at different levels, requiring minimum power and maximum power, to verify it does it. I think it only does one middle power, always, without any control, which is NOT TTL. Another method to make you believe it. Set Rear Curtain sync with a long shutter speed, at least one second. TTL flash on the hot shoe will flash twice, the TTL preflash just before the shutter opens, and the final TTL flash at the end of the shutter duration. This method allows you to see and differentiate these. Your false TTL assertion will only flash once at the end of the shutter duration, no TTL preflash. [/QUOTE]

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