Bausch & Lomb Animar 25mm F2.7 C Mount Balcote Lens (82-10)
$49.95 USD
Here is a vintage lens that was presumably optimized for animation. Note that it has no focusing mechanism.
There is a dent in the filter threads but it is otherwise in good condition. The glass is clean and free of scratches, haze and fungus. The aperture is smooth.