Not all data sheets are created equal!
Schneider's MTF graphs contain polychromatic diffraction MTF data - not just geometric MTF data. Schneider's MTF graphs are realistic indicators of actual lens performance in the field. If you are considering a lens from another supplier, it is in your best interests to ask exactly what their data sheets contain.
 

   
Extension
Tube (mm)
Magnification
Range
Working
Distance
(mm)
Filter Thread
Max.
Image
Circle
Cinegon
1.9/10mm
Compact
PDF
none
∞ - 2
∞ - 7.5
M 62x0.75*
16mm
Cinegon
1.8/16mm
Compact
PDF
none
∞ - 3.3
∞ - 41
M 30.5x0.5
16mm
 

Click PDF icon above to view datasheet
Explanation of nomenclature in datasheets.

*Requires Filter Adapter 21-014604 for Cinegon 1.9/10mm Compact