Early Nikon F Instruction Manual.  type_Continuous Lighting sharp modern 50mm design with

sharp modern 50mm design with quick autofocus and excellent wide-open performance

or without the disc for a more direct look

1 Gel holder insert for 1k

Accurate metering and shutter

All those acronyms basically mean that it's a modern macro lens with an image stabilizer for the X mount

Early Nikon F Instruction Manual. &nbsptype_Continuous Lighting sharp modern 50mm design withVery Early Nippon Kogaku K. K. (Nikon) instructional manual for the F. English language copy. Complete, but may include annotations, highlighting, etc., which do not impede readability. Image is for illustrative purposes only, actual item may differ from that pictured.