F
FJBrad
Guest
"...and Wireless flash (A or M only)" begs the question It doesn't specify non-TTL auto, nor does it specify TTL auto. It's a moot point because only pseudo-TTL (no film plane) is available anyway.
The slave mode of your PZ5000 AF operates in the same way as my SB26, I believe. The slave sensor triggers the flash, but the PZ5000 or SB26 control the flash duration internally determined by ISO and aperture info manually fed into them, and their own light sensor.
The SB30 is quite different in that the slave sensor not only senses the master flash and begins the flash exposure in response, it also senses when the master flash quenches and quenches in sync with it. Which is why placement of the SB30 relative to the master flash is so critical. It must receive a clear and unambiguous quench signal (the master flash cutting out) (and without it's own reflected light poluting the quench signal) from the camera's flash, in order to quench in sync. Effectively TTL (exposure controlled by camera) and not non-TTL auto (flash duration determined by SB30). It's really neither, but if you want to split hairs, fine.
You are, however, incorrect in your assertion that it's the same slave system as your PZ5000AF. It clearly is not.
I've only does extensive testing with the SB30 and a 995 non-preflash CP. In slave-A, the SB30 quenches in sync with the camera until the sensor on the SB30 gets out of direct allignment with the master flash, at which time it will still trigger on cue, but, lacking the ability to unambiguously detect the master flash cutting out, the SB30 flash continues to fire a full duration flash. Just as it would if it were set to manual.
One could argue whether or not it is any better in terms of delivering a correct exposure, when compared to non-TTL auto slave, as with your PZ5000AF or my SB26. The real benefit to the SB30's auto slave is that it works in full auto without any settings (ISO/ Aperture) being made on the camera or flash, and it's full range (not much), is available at any aperture/ISO setting on the camera.
It is not non-TTL in the way most people view it.
No CP or other Brand of DC has D-TTL as far as I know, unfortunately. So how could it recognize a D-TTL signal? Are we talking F5 now? As far as TTL, I'll grant you, this is a different system. But it is essentially the same, because it is the camera that is communicating a quench signal. It's not determined by the SB30's light sensor an internal calculations.
I'll take a look at this, as I've had only limited experience with using the DS20 with some preflash DC's.
It may very well be that delay circuitry isn't enough to account for the variance in timelag and # of preflashes among preflash DC's. SR Electronics Digislaves claim broad compatibility. So perhaps they have it figgered out.
Wein is also coming out with slave modules that will have preflash compatibility.
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Be the pixel.
950/990/995/4500 Mac/PhoSho5.5
FJBrad
