4.5nm Narrowband H-Alpha EDGE Filter - 50mm Unmounted
Antlia
From $385.00
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The Antlia 4.5nm Narrowband H-Alpha EDGE Filter is a precision narrowband imaging filter designed to isolate hydrogen-alpha emission at 656.3nm for enhanced deep-sky astrophotography. Combining OD5 out-of-band suppression with high transmittance (>90% within 1nm of center wavelength), this filter delivers superior signal-to-noise ratio and contrast for imaging emission nebulae, planetary nebulae, and supernova remnants. The EDGE design minimizes center wavelength shift, making it effective with both long focal ratio scopes and fast optical systems down to f/3, without requiring separate filters for different focal ratios.
Specifications
| Center Wavelength | 656.3 |
| Filter Type | Narrowband H-Alpha |
| Diameter | 50 mm |
| Mounting | Unmounted |
| Optical Quality | Transmitted Wavefront Lambda/4 or better |
| Bandpass (FWHM) | 4.5 |
| Out-of-Band Suppression | OD5 |
| Filter Thickness | 3 mm |
| Substrate Type | Single substrate |