This 300mm F6.3 lens is computer-designed using a combination of lenticular light refraction and reflection optics--the same physics used in many professional telescopes.  

Features:  
300mm f/6.3 Studio Series Telephoto Mirror Lens.  
Multi Coated low-dispersion glass， anti-reflection coating.  
A Multi-coated low-dispersion glass capable of producing sharp， high definition images.  
This gives you very sharp picture quality with less color aberration， which is considered the most harmful factor in the field of telephoto photography.  
Suit for Micro M4/3 Mount Camera. 

Specifications:  
Focal length: 300mm  
Lens Construction: 7 Elements in 4 Groups  
Angle of View: 5 degrees diagonal  
Aperture Range: F6.3  
Minimum Focusing Distance: 0.8m / 31.5in  
Filter size: 55mm 
Package size: 14.5 * 10.5 * 11cm / 5.7 * 4.1 * 4.3in  
Package weight: 423g / 14.89oz  

Package List:  
1 * Lens  
1 * Front Lens Cap  
1 * Rear Lens Cap  
1 * Hood  
1 * Lens Bag