Here's another great column from Kevin. He was smitten by three things in this article: Johnsons' Unitol developer, Agfapan 400 and the Minolta XE-1. Bearing in mind that he had a close working relationship with Johnsons he, nevertheless, seemed genuinely impressed by this no longer available brew.
I don't think the formula has ever been released although I'm open to correction on that point. I know that the company that succeeded Johnsons wouldn't release the formula for Definol to Barry Thornton even though they had no plans ever to make it again.
I can be a bit more confident about the XE-1 as I have one (it's actually the identical XE-7 made for the US market) and it's a very fine instrument. It has the lightest, smoothest film advance of any SLR I've handled. It's built like a pocket battleship and weighs about the same. The only slight negative is the viewfinder which is good but not as bright as some others.
I've got it with a PG 50mm f1.4 MC Rokkor which is as fine a standard lens as you could wish for. The Leica R3, which is essentially the same camera - there was a lot of collaboration between the two companies at this time - has a brighter screen and is probably the one to have if you can afford the dearer lenses. An R3 with a 35mm Summicron would be quite a beast.
And so onto Kevin...
35mm Photography Magazine