Roof Prisms

Material BK7   
Roof Length 27.4 and 41.1mm  
Depth 20,0 and 30,0mm
Dimension Tolerance         +0/-0.2mm  
Roof Angle ±3 arc sec  
Other Angle    ±3 arc min  
Flatness     λ/2 @ 632.8mm  
Surface Quality 60/40
Bevel   <0.25mm x 45°  
Coatings   according to your specs