Baader Filters H-alpha/OIII/SII CMOS Ultra-Highspeed 1.25" (75591)

The H-alpha filter is designed to pass light at a wavelength of 656 nm, making it the best choice for narrowband astrophotography. It delivers high-contrast imaging and reveals intricate details of nebulae, even in areas with heavy light pollution.

The OIII filter is a narrowband filter with a 3 nm bandwidth centered on a wavelength of 500 nm. It is specifically designed for observing nebulae by isolating OIII emission lines while blocking all other light, ensuring sharp and detailed images.

The SII filter is a narrowband filter that passes light at a wavelength of 672 nm with a bandpass of 3 nm. It is ideal for capturing emission nebulae, planetary nebulae, and supernova remnants.

If you want to replicate the appearance of Hubble Space Telescope (HST) images, such as the iconic "Pillars of Creation" in the Eagle Nebula (Messier 16), the SII filter is an excellent addition to your collection after H-alpha and OIII filters. Together, H-alpha, OIII, and SII filters enable tri-color narrowband imaging to achieve the famous "Hubble look." These filters also allow imaging during moonlit nights, ensuring your equipment remains active even when the moon is visible.

Specifications:

• Half-value width (nm): 3.5 & 4

Frame:

• Size: 1.25"

• Mount material: Aluminium

• Coating of optical system: Reflex-Blocker™

• Connection to telescope: 1.25"

• Filter thickness (mm): 2

Appropriate for:

• Focal ratio range: f/3.4 - f/2.3

General Information:

• Type: Filters

• Type of build: Line filter

• Series: f/3 Ultra-Highspeed

Area of Application:

• Useful for photographs: Yes

• Visually useful: No

• Nebulae and galaxies: Yes

• Moon and planets: No