---
product_id: 273830514
title: "Astromania 1.25\" Narrowband H-Alpha Night Sky Filter"
brand: "astromania"
price: "¥21800"
currency: JPY
in_stock: true
reviews_count: 2
category: "Astromania"
url: https://www.desertcart.jp/products/273830514-astromania-1-25-narrowband-h-alpha-night-sky-filter
store_origin: JP
region: Japan
---

# 90%+ transmittance >650nm 1.25" standard threading Blocks mercury & sodium vapor light Astromania 1.25" Narrowband H-Alpha Night Sky Filter

**Brand:** astromania
**Price:** ¥21800
**Availability:** ✅ In Stock

## Summary

> 🌠 Capture the cosmos, not the city lights!

## Quick Answers

- **What is this?** Astromania 1.25" Narrowband H-Alpha Night Sky Filter by astromania
- **How much does it cost?** ¥21800 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/273830514-astromania-1-25-narrowband-h-alpha-night-sky-filter)

## Best For

- astromania enthusiasts

## Why This Product

- Trusted astromania brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Optical Brilliance:** Hardened multicoatings deliver unmatched sharpness and contrast
- • **Cut Through Urban Glow:** Extreme light pollution cutoff for crystal-clear deep sky shots
- • **Infrared Emission Boost:** Enhances emission nebulae visibility even in city skies
- • **Universal Compatibility:** Fits all industry-standard 1.25" digital imagers seamlessly
- • **Precision Narrowband Pass:** 50% transition at 640nm ensures sharp H-II region contrast

## Overview

The Astromania 1.25" Narrowband H-Alpha Night Sky Filter is engineered to block urban light pollution by filtering out artificial mercury and sodium vapor emissions, while allowing over 90% transmittance of wavelengths above 650nm. Designed with hardened multicoatings and precise narrowband cutoff at 640nm, it delivers high-contrast, sharp images of H-II regions and emission nebulae. Compatible with all standard 1.25" digital imagers, this filter transforms urban night sky photography into a professional-grade experience.

## Description

The Night Sky Hydrogen-Alpha Filters are narrowband filters with a 50% transition from blocking to passing at about 640nm. At wavelengths longer than 650nm, transmittance is 90% or above. This convenient filter only allows wavelengths above 650nm through, which means it blocks a large part of the scattered light and also blocks the light from artificial mercury and sodium-vapour lamps. The filter is used as an extreme anti light-pollution filter, and for contrast-enhancement of emission nebulae and other astronomical objects bright in the infrared. The 1.25" Night Sky Hydrogen-Alpha Filter, threads into the nose-piece of industry-standard 1.25" Digital Imagers. The Astromania H-Alpha cut-off filter enhances the contrast between object and sky, allowing you to take good quality images even under urban skies.

Review: Filter quality is good, clarity is good, Brightness is reasonable for a filter.
Review: The filter frame is too thick to fit into a Blue Fireball filter holder, limiting the ease of use in my system.

## Features

- A filter with incredible light pollution cut off characteristics.
- The new H-Alpha passfilter enables high-contrast deep sky images of H-II regions.
- The H-Alpha filter shares the same outstanding features as all the other Astromania imaging filters.
- Unmatched optical quality, and high efficiency hardened multicoatings result in the sharpest and highest contrast images possible.
- The filter is used as an extreme anti light-pollution filter, and for contrast-enhancement of emission nebulae and other astronomical objects bright in the infrared.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07V7B98DT |
| Item model number | SKU_AM_ZF1HNSB |
| Manufacturer | Astromania |
| Product Dimensions | 5.44 x 4.42 x 1.88 cm; 8.5 g |

## Product Details

- **Brand:** Astromania
- **Coating description:** Multi Coating
- **Material:** Glass
- **Photo filter effect type:** Hydrogen Alpha
- **Photo filter thread size:** 3.2 Centimeters

## Images

![Astromania 1.25" Narrowband H-Alpha Night Sky Filter - Image 1](https://m.media-amazon.com/images/I/716cZ0ahUOL.jpg)
![Astromania 1.25" Narrowband H-Alpha Night Sky Filter - Image 2](https://m.media-amazon.com/images/I/71Gaa7YLl-L.jpg)
![Astromania 1.25" Narrowband H-Alpha Night Sky Filter - Image 3](https://m.media-amazon.com/images/I/71jRCKCP5EL.jpg)
![Astromania 1.25" Narrowband H-Alpha Night Sky Filter - Image 4](https://m.media-amazon.com/images/I/81--mk7md-L.jpg)
![Astromania 1.25" Narrowband H-Alpha Night Sky Filter - Image 5](https://m.media-amazon.com/images/I/81I4s7LmJtL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by C***M on 18 May 2025*

Filter quality is good, clarity is good, Brightness is reasonable for a filter.

### ⭐⭐⭐ Review
*by R***. on 18 August 2021*

The filter frame is too thick to fit into a Blue Fireball filter holder, limiting the ease of use in my system.

## Frequently Bought Together

- Astromania 1.25" H-Alpha Night Sky Filter
- Astromania 1.25" O-III Filter - Enhances Contrast During Visual Observation of Gaseous and Planetary Nebulae in All Sky Conditions, The Veil, Ring, Dumbbell and Orion Nebula, Among Many Other Objects
- Astromania 1.25" UHC (Ultra High Contrast) Filter - Superb Views of The Orion, Lagoon, Swan and Other Extended Nebulae

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**Shop now:** [https://www.desertcart.jp/products/273830514-astromania-1-25-narrowband-h-alpha-night-sky-filter](https://www.desertcart.jp/products/273830514-astromania-1-25-narrowband-h-alpha-night-sky-filter)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-21*