Re: Z-1P and TTL flash with pre-A lenses

[Joe Wilensky]

TTL is done through off-the-film metering, albeit as a separate 
system from the Z-1p (and the Z1, SF1/SF1n, Super Program) camera's 
regular light metering system. The LX is the only Pentax camera to 
incorporate both TTL metering as well as off-the-film light metering 
at the time of exposure (and thus truly is a horse of a different 
color)!

The Z-1p, and the other non-LX Pentax cameras with TTL flash 
capabilities, still use either centerweighted, spot, or segmented 
metering for determining the ambient light exposure. The TTL metering 
cell is only used for TTL metering, which pretty much simply cuts the 
flash output off at the right moment.

Joe

Joe Wilensky wrote:

It's always problematic to test TTL flash with no film in the 
camera. Since the sensor is measuring light reflected off the film, 
it's measuring what would seem to be a reduced amount of light 
reflecting off the black pressure plate instead.

I may be wrong but I do not recall  the Pz-1p having OTF 
metering.... That's totally different from TTL

Now the LX, that's a horse of a different color....  :-)

Later,
Gary


--

Joe Wilensky
Staff Writer
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