# Lens gallery

> The same white beam through a few different lenses — focus and colour fringing side by side.

![Lens gallery](https://www.loomrume.com/optics/stills/lens-gallery.png)

**Studio bench** · A comparison bench

Spherical surfaces are easy to grind and they do not bring all colours, or all zones, to the same place. An asphere can fix the zones; two glasses of different dispersion can fix the colours. Putting them on one board is the old teaching trick: same lamp, same meter, different glass.

Newton thought a colour-free lens was impossible — the argument behind the [prism](https://www.loomrume.com/examples/newton-prism.md) demo. Hall and Dollond later showed it was not. This gallery is that argument in three columns — move a lens and the fringe on the meter is the whole point.

## Sources

- [Spherical aberration](https://en.wikipedia.org/wiki/Spherical_aberration)
- [Achromatic lens](https://en.wikipedia.org/wiki/Achromatic_lens)

## Links

- [HTML](https://www.loomrume.com/examples/lens-gallery)
- [Open in Studio](https://www.loomrume.com/experiments/new?template=lens-gallery)
- [llms.txt](https://www.loomrume.com/llms.txt)