Nikkor-H Auto 50mm F2 lens, filter thread 52mm - Model Name: Nikkor-H Auto - Focal Length: Approximately 50mm - Aperture: F2 - Country of Manufacture: Japan Manufacturer: Nippon Kogaku Brand: NIKKOR Model Name: NIKKOR-Q Auto 1:3.5 f=13.5cm (or 135mm F3.5) Mount: Nikon F mount (non-Ai type) Focal Length: 13.5cm (135mm) Maximum Aperture (F-number): 1:3.5 (F3.5) Serial Number: No.723750 Yellow filter included. Thank you for viewing. I don't know much about cameras, so I had AI write the description.