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.
 

		Image circle	Working distance	Magnification range	Filter Thread
Apo Componon 4.5/90		90mm	150mm	0.2x - 0.4x	M40.5x0.5
Macro-Symmar 5.6/120-0058		90mm	212mm	0.88x - 1.13x	M40.5x0.5
Macro-Symmar 5.6/120-0059		90mm	252mm	0.63x - 0.88x	M40.5x0.5
Macro-Symmar 5.6/120-0060		90mm	333mm	0.38x - 0.63x	M40.5x0.5
Macro-Symmar 5.6/120-0061		90mm	543mm	0.26x - 0.38x	M40.5x0.5
Micro-Symmar 2.8/50		62mm	260mm	3.5x	M30.5x0.5
MacroVaron 4.5/85		62mm*	237-106mm	0.5x - 3.5x	M37x0.75
MacroVaron 4.5/85 with Beam Splitter		62mm*	237-106mm	0.5x - 3.5x	M37x0.75
	Click PDF icon above to view datasheet Explanation of nomenclature in datasheets. *For magnifications 1:2 to 2:1