Getting the measure of aspheric and freeform lenses
4 September 2020
Lens features have been getting too small to properly characterise – but metrology providers are catching up, finds Andy Extance
Lens features have been getting too small to properly characterise – but metrology providers are catching up, finds Andy Extance
Keely Portway looks at some of the latest advances in light-based test and measurement techniques
Verifying the surface quality of optics has long relied on a visual, non-quantitative approach, finds Jessica Rowbury
Aspheres and other freeform optics are becoming more commonly used in areas like consumer electronics - but, as these lenses move further away from rotational symmetry, can the metrology equipment to test them cope? Tom Eddershaw finds out