Ian,
Are you familiar with the image quality of the Nikkor 80-200mm f/4 AIS zoom lens?
Tom
Back around 1983 or so, I decided to buy a Tokina 80-200mm f/2.8 instead of this lens. That lens performed well for me until early this century; I then upgraded to an 80-200mm f/2.8 AF-Nikkor. But when a perfect 80-200mm f/4 came on the market for just over $100, I couldn't resist.
It was a fine lens for its day. Unfortunately, its day was over 25 years ago. Today, its in the middle of the pack. At the long end, the lack of ED glass makes itself known in the form of Longitudinal CA. By today's standards, there's also a fair amount of coma at the longer lengths -- the charts I've seen show an almost linear loss of tangential MTF as you move out from the center of the frame.
Was it worth what I paid for it? Yes, although to be honest it didn't see much use until I destroyed a 70-300mm ED. You only asked about optical quality, but physically and ergonomically I really enjoy the handling of this len on my Nikon FA.