In article <19970311221801.RAA17986@ladder01.news.aol.com>, chasams@aol.com says...

>no it is not. vivitar makes a ttl adapter for nikon f3

Uh, it helps to include a bit of what you are answering, along with
the correct attribution....;-)
I assume that you are refering to a way to adapt Nikon-TTL ISO-footed
flashes to the F3 TTL system - if so, the Vivitar adapter does not work
with most flashes (it was made for the Vivitar 5600, as I recall).
Unfortunately, there is no adapter that maintains TTL flash control
with Nikon ISO-footed flashes on the F3.
Hope This Helps