Positive Achromatic Doublets

Diameter 3.2 - 63mm  
EFL                                               4 - 150mm  
BFL

2.5 - 141.2mm

Center Thickness                     2.9 - 17.4mm  
Edge Thickness 1.8 - 9.7mm  
Diameter Tolerance   +0.0/-0.1mm
Center Thickness Tolerance ±0.2mm
Surface Figure λ/4 @ 632.8nm
Focal Length Tolerance ±2%
Centration 3~5 arc min   
Surface Quality 60/40
Bevel 0.2mm x 45°
Coating Single layer MgF2@550nm  

Negative Achromatic Doublets

Diameter 12.5 - 25mm    
EFL                                            

-25 to -100mm

BFL  

-27.5 to -102.6mm

Center Thickness                     5.3 - 7.2mm    
Edge Thickness

6.4 - 10.8mm

Diameter Tolerance   +0.0/-0.1mm
Center Thickness Tolerance ±0.2mm
Surface Figure λ/4 @632.8nm
Focal Length Tolerance ±2%
Centration 3~5 arc min   
Surface Quality 60/40
Bevel 0.2mm x 45°
Coating Single layer MgF2@550nm