Canon 20mm f/2.8 New FD ultra-wide-angle lens Flagship CDS Prism finder: this finder

CDS Prism finder: this finder has a needle which moves up / down to indicate if exposure is correct as the shutter speed dial on the finder / camera aperture are moved

Here is a good link with information about this interesting lens:

It is great for hiking

It has a superb reputation for image quality

Canon 20mm f/2.8 New FD ultra-wide-angle lens Flagship CDS Prism finder: this finderThis is a 20mm wide angle lens, giving an ultra wide view. f 2. 8 aperture. Excellent condition, both externally and optically. No signs of mould or cloudiness, and a tiny amount of dust. Comes with original Canon lens rear caps, and a 72mm skylight protective filter.