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AnakChan в Twitter: „Astro filter comparisons (part 2) - IDAS LPS-V4, NB2-PM, NB3-PM, STC DuoNarrowband in Bortle 5 skies. #IDAS #HUTECH #LPSV4 #NB2PM #NB3PM #stcoptics #narrowband #astronomy #Astrophotography https://t.co/pI7OMIlrZE“ / Twitter
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Understanding IDAS D1, P2, V4 & HEUIBII Filters - DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging - Cloudy Nights
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