The SBIG 50mm Round Blue 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 night sky images with these filters will be the envy of even the most seasoned astrophotographers!

• Blue Filter only. All other pictured colors sold separately