APOD: Massive Nearby Spiral Galaxy NGC 2841 (2021 Jan 24) - Starship Asterisk*
L04: Photometry II
Baader UBVRI Bessel R-Filter – photometric
SVBONY 2" Filter UV/IR CUT for Astronomy Telescope Infra Red Filter Moon with CCD for Astrophotography|uv/ir cut|uv ir filteruv ir cut filter - AliExpress
Astronomical spectra, filters and magnitudes
Colour of Stars
Kenko Global - Filter recommendation for shooting starry sky