On 29 Sep 98, at 19:31, Joel Wilcox wrote:
> Oly Shooters:
>
> I lack a manual for my OM-2n.
>
> 1) The "Check:Reset" setting clearly allows one to check the batteries.
> What is "reset"?
I'm not sure, but it's something added on the 2N, because my OM-
2 manual makes no reference to it.
> 2) The proper setting to achieve OTF/TTL flash is auto, I believe. I have
> apparent success with my Vivitar 4600 with dedicated module for Olympus.
>
> I'm curious as to what should happen if one uses the manual setting with
> flash?
>
> At 1/60 at F11 in auto I get a TTL flash exposure of such duration that the
> flash must recycle for about 5 seconds before the ready light is on. With
> the same settings but on manual, the flash requires almost no recycling and
> is instantly ready. Why is this?
>
My *guess* would be that the following is happening:
In auto mode, the TTL/OTF flash sensor is telling the flash when to
start, and then when to quench when it senses the correct
exposure.
But in manual mode, the camera is simply shorting the X-sync
terminal in the shoe, and doing nothing with the TTL terminal,
causing the flash fire, then immediately quench, with effectively its
minimum duration, probably around 1/40,000 sec.
I think T-series flashes will give a full dump (ie: never quenched) in
this same situation, but I don't know about the Vivitar.
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