In article <3186983B.4189@hsmpk12a-55eng.sun.com>, ductran@hsmpk12a-55eng.sun.com says...

>I have a Vivitar 285, but hear only rave review of
>Vivitar 283. Are there any difference between the two,
>and the results that they produce?

They are similar, but the 285 has a zoom head, and is certainly
low-voltage switching (and therefore safe for use on electronic
camera bodies), but older 283's were not. They are both
excellent inexpensive flashes, though they lack TTL metering.
Hope This Helps