Plano-convex, a collimated light beam passing through the lens transfer to a spot behind the lens. we also called a positive or converging lens. The distance from the lens to the focal points(mentioned as spot) is the lens focal length, which is commonly abbreviated f in diagrams and equations, and ......
| Specification | Commercial | High Precision | 
| Material | As Required Schott,CDGM.etc. | As required Schott, CDGM,etc. | 
| Diameter Tolerance | +0.00/-0.20mm | +0.00/-0.05mm | 
| Focual Length Tolerance | Typical +/-5%@633nm | Typical +/-2% @633nm | 
| Centration | Typical <3arcmin | Typical <3arcmin | 
| Surface [email protected] | L/4 | L/8 | 
| Surface Quality | 80-50 | 40-20 | 
| Bevel | 0.2-0.5 | 0.05-0.2 | 
| Coating | As required, with paint, Protection coating, high precision | |





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