Penta prisms

Material BK7
Height 5.4 - 43.3mm  
Depth 5 - 40mm
Dimension Tolerance   +0/-0.2mm    
Flatness   λ/2 @ 632.8mm
Surface Quality  60/40
Bevel   <0.25mm x 45°  
Coatings  

Reflecting surfaces aluminized,                    

overcoated with black paint    

Entrance and Exit surface   Single layer MgF2 @ 550nm