MTF50 for 25mm Lenses by Region

The Imatest MTF50 analyses are replotted using a log scale for aperture below to better separate performance values of f/2.8 and faster. The center weighted average uses an analysis of 13 points of interest weighting (center - 1.0; part-way or mid-zonal - 0.75; corner - 0.25). Regional MTF50 is also plotted for the center region (1 point), the midzonal region (8 points) and the corners (4 points).


Center Weighted Average  

Center of Field 
Midzone of Field 
Corners of the Field