*istD X Sync

[J. C. O'Connell]

from a practical standpoint there is very
very little difference between 1/150 and 1/125
in terms of exposure. Its only about 1/4 of one
 stop difference. Nothing to freak out about,
just use the 1/125 setting and forget about it.
jco

-----Original Message-----
From: pdml-bounces at pdml.net [mailto:pdml-bounces at pdml.net] On Behalf Of
Peter Loveday
Sent: Sunday, February 18, 2007 10:23 PM
To: Pentax-Discuss Mail List
Subject: 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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