Celestron OIII Filter Rasa 8 – Narrowband Filter for Nebula Observation
The Celestron OIII Filter Rasa 8 is a special narrowband filter that passes light from ionized oxygen (OIII). It is designed for the Celestron Rasa 8 telescope series and optimizes the visibility of emission nebulae for both visual observation and astrophotography.
Significantly increases contrast of emission nebulae – details visible even under light-polluted skies
46 mm filter thread compatible with Rasa 8 focuser and T-adapters – easy mounting
Black aluminum housing – robust and durable for outdoor use
24 months manufacturer warranty for long-term investment security
What distinguishes the OIII Filter
The filter works with a narrow bandpass curve that only passes the 501 nm line of ionized oxygen. This allows nebulae such as the Orion Nebula, the Dumbbell Nebula, or the Crab Nebula to be displayed with high contrast. Celestron optics ensure high transmission and minimal reflections.
Ideal for astrophotographers and visual observers
This filter is aimed at demanding amateur astronomers who wish to observe or photograph emission nebulae in detail. It helps reveal the natural nebula structure, especially under urban light pollution conditions. It is also perfectly suited for astrophotography with monochrome cameras.
How to use the filter
Screw the filter directly into the 46 mm filter thread of the Rasa 8 focuser or a T-adapter. For visual observation, place it between the eyepiece and the telescope. Make sure the filter is clean and dust-free – use a microfiber cloth for cleaning.
Celestron is a leading manufacturer of telescopes, eyepieces, and astronomical accessories based in the USA. The brand stands for optical precision and innovative technologies for amateur and professional astronomers.
An OIII filter is a narrowband filter that only passes light of a specific wavelength (501 nm) from ionized oxygen. It is used to enhance the contrast of emission nebulae and suppress ambient light.
The filter has a 46 mm filter thread and is specifically designed for the Celestron Rasa 8 telescope series. It fits into the 46 mm focuser and T-adapters with 46 mm thread. It is also compatible with other telescopes that have a 46 mm filter attachment.
It increases contrast of emission nebulae, reduces light pollution, and improves visibility of fine structures. The aluminum housing is durable, and Celestron optics provide high transmission with minimal reflections.
Simply screw the filter into the 46 mm filter thread of the focuser or a T-adapter. For visual observation, place it between the eyepiece and the telescope. Ensure dust-free mounting.
The Celestron OIII Filter Rasa 8 comes with a 24-month manufacturer warranty from the date of purchase. The warranty covers material and workmanship defects.
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