The Celestron 93623 OIII narrowband filter for 1.25-inch eyepieces enhances contrast of emission nebulae. The grey plastic housing is lightweight and robust.
Celestron 93623 Narrowband Filter – OIII Filter for 1.25 Inch Eyepieces
The Celestron 93623 narrowband filter (OIII) is an optical accessory for telescopes designed for observing emission nebulae. It suppresses stray light and only transmits the characteristic oxygen III line.
Enhances contrast of emission nebulae through selective OIII transmission
Compatible with 1.25-inch eyepieces – easy installation without adapter
Robust grey plastic ring for durable handling
Lightweight at only 0.50 kg does not burden the optics
24 months manufacturer's warranty for long-lasting enjoyment of your astro gear
What sets the Celestron 93623 apart
Unlike broadband filters, this OIII filter blocks almost all interfering urban and moonlight. Its narrow bandpass curve around 501 nm is ideal for planetary nebulae like the Ring Nebula M57 or the Crab Nebula M1. The grey plastic ring provides sufficient stability without unnecessary weight.
Ideal for...
This filter is aimed at ambitious amateur astronomers who want to visually or photographically dive into the structures of emission nebulae. Under light-polluted skies, it unfolds its strength particularly well. Beginners with telescopes from 70 mm aperture also benefit from the noticeable contrast increase.
How to use the Celestron 93623
Screw the filter into the 1.25-inch eyepiece thread.
Insert the eyepiece as usual into the telescope focuser.
Focus on a known emission nebula – the contrast is immediately visible.
Care: clean the filter surface only with an optical microfiber cloth.
Celestron is a world-leading manufacturer of telescopes and astronomy accessories, headquartered in Torrance, California. The brand is known for high-quality, innovative optics for beginners and professionals. The product range includes telescopes, microscopes, binoculars, and optical accessories.
An OIII narrowband filter only transmits the oxygen III emission line at 501 nm. It blocks all other light, especially urban light pollution, and enhances the contrast of emission nebulae.
The filter is compatible with all telescopes using 1.25-inch eyepieces. It simply screws into the eyepiece thread.
The ring is made of grey plastic. It is lightweight yet sufficiently stable for regular use.
The filter is supplied alone, without an adapter or storage case. We recommend storing it in a soft filter pouch.
Yes, the Celestron 93623 is suitable for both visual observation and astrophotography, especially for long-exposure images of emission nebulae.
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