I listed the first of several lenses I'm selling on e-Bay to fund investments in newer studio equipment for CToddCreations.
I'm giving up a bit of history here. This is a 16mm fish-eye lens that my grandfather used to use, back in the days of SLR-only (film-based) cameras. I love the effect of this unique lens. It is able to work with some modern-day DLSR cameras by Sony.
It also comes with built-in filter options: 1A, Y48, 80B and O56. With many modern image editing programs, color filters and camera/lens compensation adjustments can be applied during post-production. But, there's something magical and unique about actual lens filters' effects on an image - even an image from a modern DLSR camera.