Baader Filters SII CMOS f/2 Highspeed 50x50mm

SII Filter: The narrowband S-II 7nm filter allows light at a 672nm wavelength with a bandpass of 3nm, tailored for nebula photography.

It's well-suited for capturing most emission nebulae, planetary nebulae, and supernova remnants.

For those aiming to achieve the iconic aesthetics reminiscent of Hubble Space Telescope (HST) images, such as the renowned "Pillars of Creation" in the Eagle Nebula (Messier 16), the next essential addition to your filter collection after H-alpha and OIII is the SII (es-two) or sulfur filter. Like H-alpha, the SII filter operates in the deep red spectrum near 672 nm. Utilizing H-alpha, OIII, and SII filters collectively recreates the distinctive Hubble-like appearance for many emission nebulae. Furthermore, tri-color narrowband imaging with these three filters remains feasible even during moonlit nights, ensuring continuous utilization of your equipment.

Specifications:

Capacity:

Central Wavelength: 671.7 nm

Half-value Width: 6.5 nm

Frame: Frames

Mount Material: Aluminum

Coating of Optical System: Reflex-Blocker™

Suitable for apertures ranging from f/3.4 to f/1.8

Filter Thickness: 2 mm

Filter Size: 50 x 50 mm

General:

Type: Filters

Type of Build: Line filter

Series: f/2 Highspeed

Area of Application:

Useful for Photographs: Yes

Visually Useful: No

Twin Stars: No

Moon & Planets: No

Nebulae & Galaxies: Yes