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Re: [OM] TTL flash with OM-4(T)

Subject: Re: [OM] TTL flash with OM-4(T)
From: Jose Afonso <jm_afonso@xxxxxxxxxxx>
Date: Mon, 22 Jul 2002 13:25:18 +0100 (BST)
Hello Moose,

don't know about the shoe cord, but my OM4,
Ti-modified works fine with a T32 (via hot shoe). The
viewfinder light does flicker to confirm successful
TTL operation.

hope this helps
Jose

 --- dreammoose <dreammoose@xxxxxxxxx> wrote: 
> Here's a question for the wonderful collective
> knowledge of the group.
> 
> I picked up a TTL Auto Shoe Cord T 0.6 so I could do
> TTL flash with 
> OM-PC bodies (No immediate need, I have OM-4 bodies
> and Shoe 4s and TTL 
> cord adapters for OM-2n bodies, just Zuikoholism at
> work.) To check out 
> the cord quickly, I connected it to the closest
> appropriate camera at 
> hand, an OM-4 with the T(i) circuit modification and
> a T32. It didn't 
> work properly at first. Checking, I found the hot
> shoe contacts needed 
> cleaning, which fixed all but one problem.
> 
> This led me to check out flash operation with
> several cameras. I found 
> that TTL flash worked properly with most of my
> bodies, except.:  I have 
> two OM-4 bodies, both with the 4Ti circuit
> replacement, as determined by 
> the tests shown in Clint's contribution on the
> subject on  Mark's site 
>
<http://olympus.dementia.org/Hardware/OM-4_circuits.html>
> . On both of 
> these cameras, everything works except the flash
> ready light does not 
> flicker to confirm successful TTL flash operation.
> The light on the 
> flash flickers, but not the one in the viewfinder;
> it simply goes dark 
> until the flash is fully charged. This is true of
> both bodies, via hot 
> shoe or TTL cord, with a flash that properly
> operates the viewfinder 
> flash ready light on an OM-2n, OM-PCs and an OM-4Ti.
> The OM-4 manual 'B' 
> says this should work, but I don't have an OM-4 with
> the original 
> circuit to check Do I happen to have two 'Mod 6'
> circuit cameras with 
> the same failure, or is this just the way the new
> circuit works with the 
> old LED setup (maybe not enough current to activate
> the old LED?) or is 
> it a common error in the upgrade or ..........?
> 
> Any help appreciated,
> 
> Moose
> 
> 
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