---
title: "Axial Chromatic Aberration calculator — AperiOptic"
description: "Longitudinal focal shift from Abbe number dispersion. Free online optics calculator, with the formula and code snippets."
url: "https://aperioptic.com/calculators/axial-chromatic-aberration"
---

# Axial Chromatic Aberration calculator

Longitudinal focal shift from Abbe number dispersion.

Category: [Aberrations](https://aperioptic.com/calculators)

Formula: `Δf ≈ f / V (mm)`

## Inputs

| Input | Parameter | Unit | Default |
| --- | --- | --- | --- |
| Focal length | `f` | mm | 100 |
| Abbe number V | `V` |  | 64 |

## Result with the default inputs

- Δf (F to C): 1.5625 mm
- Δf / f: 1.5625%

Open it with your own values: put each input in the address as a parameter, for example [`/calculators/axial-chromatic-aberration?f=100`](https://aperioptic.com/calculators/axial-chromatic-aberration?f=100). A unit other than the listed one goes in `<parameter>_unit`.

Read more: [Wikipedia: Chromatic aberration](https://en.wikipedia.org/wiki/Chromatic_aberration)

[All optics calculators](https://aperioptic.com/calculators)

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The interactive page: https://aperioptic.com/calculators/axial-chromatic-aberration (AperiOptic runs in the browser; free, no account). Every page of the site as Markdown: https://aperioptic.com/llms.txt