In article <33CA8B3F.4581@worldnet.att.net>, mzahorcak@worldnet.att.net says...

>The Nikon F-3 has TTL flash metering.
>
>I'd like to be able to use an F-3 with a couple of Nikon TTL flash
>units that I already own. However, my current units all have an
>'ISO' foot and the F-3 takes a special Nikon foot, and requires a
>dedicated flash like the SB-16A.
>
>The Nikon AS-4 adapter converts the Nikon mount on the camera to an
>ISO mount, but loses the TTL flash metering.
>
>I think that years ago Vivitar made a hot shoe adapter that converted
>the Nikon-mount hot shoe on the F-3 to a regular ISO shoe that still
>retained the F-3's TTL flash metering ability. I believe that
>Vivitar called it a Vari-Adaptor
>
>Anyone know where I can get one of those? Or have any other
>suggestions besides dumping all the Nikon gear and starting over?

The F3 TTL system is a good one, but with some limitations, alas
(slow max sync speed, ASA limited to 400...) - and it is compatible
with no other... The Vivitar adapter allowed use of particular
Vivitar flashes that permitted meaningful changing of ASA speed on
the flash itself - a unique and very useful ability (it could be used to
set TTL fill-ratios - I'm still kicking myself for not grabbing some of
those flashes...;-). I would consider using one of the Nikon SB-24/5/6/7
series as an auto flash on the F3 (they have a wide range of useable "A"
f-stop settings), or looking for the compact and reasonably inexpensive
(used) SB-12 or SB-17 F3-dedicated flashes... (and if you add an AS-7
shoe, or SC-14 remote cord, you can set TTL fill ratios with these or
the SB-16 flashes...).
Hope This Helps
(David Ruether - http://www.fcinet.com/ruether )