ZWO 7nm OIII Filter 2" 50.8mm - Improve your astro images with OIII

The ZWO O-III 7nm narrowband filter is specifically designed for astrophotography, focusing on a wavelength of 500nm. It can be used in combination with H-Alpha and S-II filters to achieve "Hubble-like" images. By selectively reducing the transmitted wavelengths, this filter suppresses the effects of public lighting, allowing you to improve the contrast of your astrophotographic images.

Key Features

• Targeted wavelength: 500nm (O-III)
• FWHM ("Full Width at Half Maximum") : 7nm (+/-0.5)
• Infrared cut-off: 700/1100nm
• High-quality Schott glass
• Glass thickness: 1.85mm
• Precision optical polishing to ensure a precise wavefront at lambda/4 and parallelism <30" of arc on both surfaces
• Dual-sided optical coating
• Anti-reflection treatment

Usage

• Excellent for enhancing the contrast of nebulae in CCD imaging, digital photography (unmodified and modified cameras)
• Incompatible with visual observation, film photography, webcams, and planetary videos

Construction

• CNC-machined aluminum cell for high manufacturing precision
• Available in 4 formats: threaded 31.7/50.8mm and unmounted 31mm/36mm circular

With its FWHM of 7nm, the ZWO OIII 7nm 50.8mm filter offers significant contrast compared to the sky background, on celestial objects emitting doubly ionized oxygen (diffuse/planetary nebulae). Use it to improve your astrophotographic images and achieve professional results.