I bought the lens back in 1988 (+/-) and it was perfect on the T90. In the meantime I used it with an adapter on Olympus cameras, with moderate success: the purple fringing at wide apertures was too apparent. It is much more rewarding to use on Zf. Besides, manufacturing quality is high and handling is near-perfect. You just have to get used to the reverse focussing helicoid, coming from Nikon, but the Canon convention is shared by many others including Leica-R.