DESC: Product Features: Lens Type: Fixed Focal Length Lens; Camera Format: Digital SLR; Focus Type: Manual Focus; Focal Length: 500mm; Min Aperture: f/8; Macro Lens: With Macro Lens; Attachment / Filter Size: 30.5 mm; Groups / Elements: 7 Elements in 6 Groups; Designed for Digital Camera: Yes; Diameter: 3 in; Length: 3.4 in; Weight: 12.7 oz