*istD X Sync

[Jens Bladt]

I believe the flash is normally fired in the beginning of the period of
fully opened shutter (first or leading curtain sync) - unless of course the
camera/flash is set to last or trailing curtain sync, which mean that the
falsh will then fire just before closing time.

Regards
Jens Bladt


http://www.jensbladt.dk
+45 56 63 77 11
+45 23 43 85 77
Skype: jensbladt248

-----Oprindelig meddelelse-----
Fra: pdml-bounces at pdml.net [mailto:pdml-bounces at pdml.net]Pa vegne af Peter
Loveday
Sendt: 19. februar 2007 04:23
Til: Pentax-Discuss Mail List
Emne: Re: *istD X Sync


> 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


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