> For the complete documentation index, see [llms.txt](https://docs.kostacloud.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kostacloud.com/optimization/imaging-optimization/real-ray-metrics.md).

# Real Ray Metrics

### RMS Spot Radius (Real Rays)

**Details Coming soon**

### Sagittal RMS Spot Radius (Real Rays)

**Details Coming soon**

### Tangential RMS Spot Radius (Real Rays)

**Details Coming soon**

### Geometric Spot Radius (Real Rays)

**Details Coming soon**

### Sagittal Geometric Spot Radius (Real Rays)

**Details Coming soon**

### Tangential Geometric Spot Radius (Real Rays)

**Details Coming soon**

### Astigmatism + Petzval (Real Rays)

**Details Coming soon**

### Axial Color (Real Rays)

**Details Coming soon**

### Distortion (Real Rays)

**Details Coming soon**

### Centroid Distortion (Real Rays)

**Details Coming soon**

### Exit Pupil Location (Real Rays)

**Details Coming soon**

### Reference Sphere Radius (Real Rays)

**Details Coming soon**

### Chief Distortion vs Field (Real Rays)

**Details Coming soon**

### RMS vs Field (Real Rays)

**Details Coming soon** 

### Encircled Energy (Real Rays)

**Details Coming soon**

### Ensquared Energy (Real Rays)

**Details Coming soon**

### Number Vignetted Rays (Real Rays)

**Details Coming soon**

### Number Failed Fields (Real Rays)

**Details Coming soon**

### Transmission (Real Rays)

**Details Coming soon**

### Statistical Effective Focal Length (Real Rays)

**Details Coming soon.**

### Statistical Sagittal Effective Focal Length (Real Rays)

**Details Coming soon**

### Statistical Tangential Effective Focal Length (Real Rays)

**Details Coming soon**

### Statistical Back Focal Distance (Real Rays)

**Details Coming soon.**

### Statistical Sagittal Back Focal Distance (Real Rays)

**Details Coming soon**

### Statistical Tangential Back Focal Distance (Real Rays)

**Details Coming soon**


---

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