---
product_id: 222548050
title: "Optolong L-Extreme 7nm Dual Narrowband Filter (H-Alpha and O-III) (1.25\")"
brand: "optolong"
price: "R$3895"
currency: BRL
in_stock: true
reviews_count: 2
category: "Optolong"
url: https://www.desertcart.com.br/products/222548050-optolong-l-extreme-7nm-dual-narrowband-filter-h-alpha-o
store_origin: BR
region: Brazil
---

# 7nm dual narrowband precision Optimized for moonlit & light-polluted skies Perfect for one-shot color cameras Optolong L-Extreme 7nm Dual Narrowband Filter (H-Alpha and O-III) (1.25")

**Brand:** optolong
**Price:** R$3895
**Availability:** ✅ In Stock

## Summary

> 🌠 Capture the cosmos like a pro—no filter juggling required!

## Quick Answers

- **What is this?** Optolong L-Extreme 7nm Dual Narrowband Filter (H-Alpha and O-III) (1.25") by optolong
- **How much does it cost?** R$3895 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/222548050-optolong-l-extreme-7nm-dual-narrowband-filter-h-alpha-o)

## Best For

- optolong enthusiasts

## Why This Product

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

## Key Features

- • **Fast System Friendly:** Engineered for high-speed optics to maximize signal-to-noise ratio effortlessly
- • **Compact & Lightweight:** Weighs just 1.13 oz with sleek 1.25" size—easy to integrate into your astrophotography setup
- • **Light Pollution Slayer:** Blocks unwanted wavelengths to reveal deep-sky wonders even in urban or moonlit conditions
- • **One-Shot Color Compatible:** No need for multiple filters—capture vibrant color nebula images in a single shot
- • **Dual 7nm Narrowband Mastery:** Pinpoints H-Alpha & O-III emission lines for stunning nebula contrast

## Overview

The Optolong L-Extreme 7nm Dual Narrowband Filter is a precision-engineered 1.25" filter designed for one-shot color astrophotography cameras. It isolates the H-Alpha and O-III emission lines to maximize nebula contrast and signal-to-noise ratio, enabling clear imaging even under bright moonlight or urban light pollution. Lightweight and optimized for fast optical systems, it’s the go-to filter for amateur astronomers seeking vibrant emission nebula images without the hassle of multiple filters.

## Description

The Optolong L-eXtreme is a 7nm dual-bandpass filter which can be used with one-shot color cameras like DSLRs and CCD/CMOS astrophotography cameras. It is also more suited for fast systems. The convenience and cost effectiveness of this filter allows amateurs to image emission nebulae even in bright, light-polluted or moonlit skies. The L-eXtreme isolates the H-Alpha and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio of the nebulae are maximized. For people who are imaging in very light polluted areas or when the moon is out, the L-eXtreme is an excellent choice. The advantage of the L-eXtreme filter is that there is no light transmission between the H-beta and OIII lines (as there are no nebula emission lines there). This reduction in light pollution maximizes the nebula's signal and makes the sky background darker while imaging. Unlike the L-eNhance filter, which is a tri-band (transmits Hb, Ha, and OIII), the L-eXtreme filter is dual-band, passing just the Ha and OIII emission lines in order to deliver improved light pollution rejection. Note: For imaging galaxies and reflection nebulae, the Optolong L-Pro filter is more appropriate as this filter will reject much of the light from those objects.

Review: Really exposes Hydrogen alpha and Oxygen III in nebulas - Works extremely well. MUST use calibration frames (flats) to maximize the capability of this lens, though flats are a staple of this hobby anyway.
Review: No difference in heavily lit environments - Unfortunately this filter made no difference in views since the light pollution was too heavy in my area. If you live in an area where many street lamps are concentrated or are not that far away (both), don't waste your time or money. If on the outskirts of a city or town, it may be of some benefit like people say. I have never had any luck with any filter in my area, so this is all very dependent on location.

## Features

- Dual H-Alpha/O-III 7nm narrowband filter
- Allows for imaging in bright man-made light pollution and moonlit conditions
- Most useful for One-Shot Color cameras
- Take color images without needing to combine images with multiple filters
- Use for taking images of emission nebulae

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08BWVFQWT |
| Best Sellers Rank | #59 in Telescope Filters |
| Customer Reviews | 4.5 4.5 out of 5 stars (18) |
| Date First Available | June 26, 2020 |
| Item Weight | 1.13 ounces |
| Item model number | 139 |
| Manufacturer | Optolong |
| Product Dimensions | 2.95 x 2.76 x 0.79 inches |

## Product Details

- **Brand:** Optolong
- **Material:** Glass
- **Photo Filter Thread Size:** 3.17 Millimeters
- **Coating Description:** Multi Coating
- **Photo Filter Effect Type:** Enhancing
- **Water Resistance Level:** Not Water Resistant
- **Product Dimensions:** 1.25"L x 1.25"W

## Images

![Optolong L-Extreme 7nm Dual Narrowband Filter (H-Alpha and O-III) (1.25") - Image 1](https://m.media-amazon.com/images/I/61OUObRMrBL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Really exposes Hydrogen alpha and Oxygen III in nebulas
*by A***K on August 8, 2025*

Works extremely well. MUST use calibration frames (flats) to maximize the capability of this lens, though flats are a staple of this hobby anyway.

### ⭐ No difference in heavily lit environments
*by T***T on July 11, 2022*

Unfortunately this filter made no difference in views since the light pollution was too heavy in my area. If you live in an area where many street lamps are concentrated or are not that far away (both), don't waste your time or money. If on the outskirts of a city or town, it may be of some benefit like people say. I have never had any luck with any filter in my area, so this is all very dependent on location.

## Frequently Bought Together

- Optolong L-Extreme 7nm Dual Narrowband Filter (H-Alpha and O-III) (1.25")
- SVBONY SV226 Telescope Filter Drawer, Photographic Filters Drawer with M42-M48 Adapter, Double Magnetic Filter Holder for 1.25 and 2 Inches Filter Mounted, for Deep Sky Photography
- Celestron T-Adapter with SCT 5, 6, 8 with 9.25, 11, 14, Black (93633-A)

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**Shop now:** [https://www.desertcart.com.br/products/222548050-optolong-l-extreme-7nm-dual-narrowband-filter-h-alpha-o](https://www.desertcart.com.br/products/222548050-optolong-l-extreme-7nm-dual-narrowband-filter-h-alpha-o)

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-01-22*