Chroma SII 8nm Narrowband Filter – 31mm For Cheap

Chroma SII 8nm Narrowband Filter – 31mm

Chroma SII 8nm Narrow Band Filters are essential for imaging objects, like nebulae, that are rich in ionized sulfur atoms. These line emission filters work extremely well in heavy light-polluted areas and allow you image on nights when the moon is up.

• Parfocal for systems f/4.0 or slower
• Transmitted wavefront better than 0.25 waves/inch
• Parallelism: less than 30 arcsec
• Made in the U.S.A.
• H-Alpha 8nm Narrow Band Filter