The SBIG 50mm Round Sulfur II Filter is compatible with FW8S-STXL filter wheels, as well as the older STXL self-guided filter wheels. They are specifically built to SBIG's exact specifications. This filter is also parfocal, avoiding the need for unnecessary refocusing. Your deep-sky images with these filters will be the envy of even the most seasoned astrophotographers!
Sulfur II (SII) Filter: 672.4 nm, bandwidth 6.5nm
SII filter only. All other pictured filters sold separately