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MTF Chart: Canon EF 50mm f/1.4 USM
Canon | Prime | f/1.4
Avg Center Sharpness
70%
Very Good
Avg Edge Sharpness
43%
Fair
Center-Edge Delta
27%
Noticeable falloff
30 lp/mm Score
62%
Fine detail resolution
Reading MTF Charts
- Higher is better: 1.0 = perfect contrast reproduction
- 10 lp/mm: Coarse detail / contrast (thick lines)
- 30-40 lp/mm: Fine detail / resolution (thin lines)
- Center vs Edge: Difference shows field uniformity
Quality Guidelines
| Score @ 30 lp/mm | Rating |
|---|---|
| > 0.85 | Excellent |
| 0.70 - 0.85 | Very Good |
| 0.55 - 0.70 | Good |
| < 0.55 | Fair |
Sagittal vs Meridional
Sagittal (solid lines): Lines running from center to edge of image.
Meridional (dashed lines): Lines running tangent to circles around center.
Large differences between these indicate astigmatism in the lens.