---
title: "Filters for Astrophotography"
canonical: https://stackingstarlight.com/equipment/filters
description: "Filters select wavelengths: LRGB broadband for natural color, narrowband (Hα/OIII/SII) to isolate nebula lines and block light pollution."
---

# Filters for Astrophotography

> Filters select wavelengths: LRGB broadband for natural color, narrowband (Hα/OIII/SII) to isolate nebula lines and block light pollution.

Filters choose which light reaches the sensor. **LRGB** (luminance + red/green/blue) capture natural color with mono cameras. **Narrowband** filters (Hα 656nm, OIII 501nm, SII 672nm; 3–7nm wide) isolate single nebula emission lines and reject nearly all artificial light. **Dual-narrowband** filters (L-eXtreme, L-Ultimate) pass Hα+OIII together for one-shot-color cameras — the simplest way to image emission nebulae from a city. For light-polluted skies a dual-narrowband filter is a game-changer.

---

Source: [https://stackingstarlight.com/equipment/filters](https://stackingstarlight.com/equipment/filters) · Part of [Stacking Starlight](https://stackingstarlight.com) by Michael Kalika.

LLM resources: [LLM index (llms.txt)](https://stackingstarlight.com/llms.txt) · [Complete LLM text (llms-full.txt)](https://stackingstarlight.com/llms-full.txt) · [Markdown homepage (index.md)](https://stackingstarlight.com/index.md)