ZWO 36mm OIII Filter - 7nm
Best narrow-band filter for dedicated deep-sky astrophotographers.
Enhance your astrophotography with this advanced nebula filter, designed to reveal intricate details in celestial objects. It precisely isolates a 7nm bandwidth of light centered around 500nm, significantly boosting contrast beyond standard RGB imaging. This offers a unique perspective on deep-sky photography, showcasing stunning nebulae with exceptional clarity. Crafted from durable glass, it ensures consistent performance and longevity for dedicated stargazers, making it an essential tool for capturing the cosmos.
$169.00
Owner Satisfaction
4.7
/ 5
Category Rank
607
/ 2593
#607 in Telescope Accessories
Price vs Category Average
-75%
Below average
Bandpass
7
/ nm
Who it's for
- Astrophotographers capturing faint nebulae in light-polluted skies
- Advanced imagers using filter wheels with larger sensors
- Serious hobbyists requiring reliable, long-term imaging equipment
Who should skip it
- Beginners lacking the patience for long-exposure imaging sessions
- Budget-conscious photographers seeking versatile, all-purpose filters
- Users uncomfortable with delicate, unmounted optical hardware
Performance breakdown
Contrast Enhancement
The 7nm bandwidth effectively cuts light pollution for deep-sky clarity.
Spectral Precision
Tight isolation at 500nm ensures high-fidelity OIII signal capture.
Build Durability
High-grade glass construction withstands rigorous outdoor astrophotography sessions.
Imaging Versatility
A specialized tool that elevates standard RGB setups to professional levels.
Signal-to-Noise Ratio
Significant reduction in background noise reveals faint, intricate nebula structures.
Integration Ease
Standard 36mm sizing fits seamlessly into most common filter wheels.
Key Specs
Bandpass
7nm
Filter Shape
Round
Filter Type
OIII
Size
36mm
Material
Glass
Accessory Type
Filter
Filter Type
Nebula
Know before you buy
The 7nm bandwidth significantly increases contrast by isolating only the specific light emitted by ionized oxygen. This allows you to capture faint nebular structures that would otherwise be washed out by light pollution or background sky glow in standard RGB imaging.
This 36mm round filter is designed for use in electronic filter wheels that accommodate unmounted filters. Please verify that your filter wheel or camera drawer supports the 36mm format before purchasing.
This filter is optimized for astrophotography. While it can technically be used visually, the narrow 7nm bandpass will make the view extremely dim, and it is not intended for standard eyepiece observation.
Yes, this OIII filter is typically used as part of a narrowband imaging set, often alongside Hydrogen-alpha (Ha) and Sulfur-II (SII) filters. Combining these allows you to create the popular 'Hubble Palette' false-color images.
Because the filter blocks a large portion of the light spectrum, you will need to increase your exposure times compared to unfiltered imaging. However, the resulting gain in signal-to-noise ratio and contrast makes it well worth the longer integration time.
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$169