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Sep192026
Lenses & Optical Components surface flatness vs wavefront error

Surface Flatness vs Wavefront Error

Lenses & Optical ComponentsBy giai2026-09-19

Surface flatness and wavefront error are related, but they are not interchangeable specifications. Surface flatness describes how much a nominally flat optical surface departs from an ideal plane. Wavefront error describes how much an optical component or system changes the shape of an optical wavefront…

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Sep192026
Filters & Coatings optical surface error spatial scales illustrative

Scratch-Dig vs Surface Roughness

Filters & CoatingsBy giai2026-09-19

Scratch-dig limits discrete local defects; surface roughness is the RMS height of fine texture across the whole surface. The MIL-PRF-13830B scratch number is a visibility grade, not a width; the dig number is diameter in 0.01 mm. Roughness-driven scatter scales with (σ/λ)², so the same…

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