*istD X Sync

[Peter Loveday]

> The ambient light should be contributing almost
> nothing to the exposure under these circumstances. The
> duration of the flash exposure is 1/1000-1/20,000 sec,
> depending upon the exposure.  X synch fires the flash
> at the midpoint of the shutter's exposure. So, the
> shutter speed should make no difference at all.
>
> Or is there something I am missing too?

Oh, I'm not complaining about the results I get at 1/125, it does work as 
expected.

Its just that every one of my other Pentax bodies (8 in all) allow me to set 
them to X sync; either by an explicit X position, or by virtue of the fact 
it is a 'standard' shutter speed, like 1/125 etc.

I was just suprised that there is no way to set it to 1/150 at all.  It does 
select that with an external dedicated flash, just can't do it with a PC 
connection.

- Peter