This is a Carl Zeiss Prime lens specifically modified for use with digital cinema and photography. It is a one of a kind piece because the leaf shutter has been taken out and due to this fact it leaves some insanely awesome bokeh. If you look closely in the lens you will see 4 small pieces left from the shutter which where left there on purpose. It doesn't show in the image it only helps with the look of the lens. The focus ring has been professionally lubed for smooth focus and it includes the original Hasselblad lens hood. This particular lens is modified for Nikon F mount but apon request I can include a Nikon f to canon Eos adapter. This is one of my favorite lenses and sad to see it go. there is minimal internal dust as should be expected but no image quality effecting matters. THIS WILL NOT WORK ON A HASSLEBLAD V CAMERA WITH NO INTERNAL SHUTTER BECAUSE THERE IS NO LEAF REMAINING. Iris blades are smooth and oil free as well.