We offer a range of color, narrowband, and photometric filters for each of our camera series. We offer filters from Baader Planetarium and Custom Scientific. Smaller STF sensors use 1.25″ filters. Larger sensor STF models use 36 mm filters, as does the STT camera series. STXL cameras use 50 mm round sensors. STX cameras use either 50 mm square or 65 mm square depending on the filter wheel choice.