Durable glass
| QuartzLine | B270 | Plastic | |
| Refractive index | 1.456 | 1.523 | 1.58 |
| Surface reflectance | 0.034 | 0.042 | 0.056 |
| Stress-relief temperature | 1120°C | 510°C | 463°C |
Low reflective surface resistant to extreme temperatures and a refractive index of only 1.456.
Handmade 4-part frame, allows smoother filter adjustment than a frame made of aluminum
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