---
title: "Choosing a deep-sky camera (cooled CMOS vs DSLR; mono vs OSC)"
canonical: https://stackingstarlight.com/buy/camera
description: "The camera decision is three smaller decisions: **cooled astro-CMOS vs a DSLR/mirrorless**, **mono vs one-shot-color**, and **pixel size vs your scope**. Decide in that order."
---

# Choosing a deep-sky camera (cooled CMOS vs DSLR; mono vs OSC)

> The camera decision is three smaller decisions: **cooled astro-CMOS vs a DSLR/mirrorless**, **mono vs one-shot-color**, and **pixel size vs your scope**. Decide in that order.

## 1. Cooled astro-CMOS vs DSLR

A **cooled CMOS** astro camera gives regulated cooling (repeatable darks, far less thermal noise) and
no IR-cut filter blocking hydrogen-alpha — the standard for deep sky. A **DSLR/mirrorless** you may
already own is a fine, cheaper start, especially modded, but expect more thermal noise from the
uncooled sensor, especially on warm nights.

## 2. Mono vs one-shot color (OSC)

- **OSC** is simpler — one camera, color in every frame, less time per target.
- **Mono + filters** collects more light per pixel and shines for narrowband, at the cost of more
  gear and acquisition time.

This is its own decision with real trade-offs — see
[mono vs one-shot color](/compare/advanced/mono-vs-color.md) before committing.

## 3. Pixel size vs your scope (sampling)

Match pixel size to your focal length so you're not badly over- or under-sampled. As a rough guide,
aim for an image scale around **1–2 arcsec/pixel** for typical seeing; compute it from your camera's
pixel size and scope focal length rather than guessing.

## 4. Practical specs to compare

- **Sensor size** (fits your scope's image circle?).
- **Read noise & full-well** (low read noise favors many shorter subs).
- **Cooling delta** and power needs.
- **Bit depth** (12–16-bit ADC).

## 5. Budget tiers (confirm current models)

- *Entry:* a used/modded DSLR you already have, or a small cooled OSC.
- *Mid:* a cooled OSC sized to your scope; or step to mono + filters if narrowband is the goal.

---

How sensors capture light: [how camera sensors work](/sensor). Match the camera to optics in
[choosing a telescope](/buy/telescope).

---

Source: [https://stackingstarlight.com/buy/camera](https://stackingstarlight.com/buy/camera) · 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)