Review of the SVbony SV220 3nm Dual band H-Alpha&OIII Filter
Jim Thompson, P.Eng., reviews the SV220 3nm H-Alpha & OIII filters and compares them against industry benchmark brands. Read More
Blog
The Third Interstellar Comet 3I/ATLAS: Natural or Alien?
3I/ATLAS originates from beyond solar system, comet 3I/ATLAS is only the third interstellar visitor ever seen, following 1I/ʻOumuamua and 2I/Borisov. Read More
What is a "blood moon"?
The "blood moon" is a total lunar eclipse, and the next one will occur from September 7 to 8, 2025. In most parts of China (except a small part of the Northeast), the entire process can be seen. In addition, regions such as Asia, Europe, Oceania, Africa, and Antarctica can also witness this celestial event. Read More
Light Pollution? SV220 3nm Dual-Band Filter Still Gets Sharp Deep-Sky Images!
Struggle with light pollution in astrophotography? The SV220 2-inch 3nm dual-band narrowband filter is your solution. With 3nm ultra-narrow bandwidth, 300-1050nm spectral coverage, and OD5 light blocking, it cuts through urban glow to capture crisp H-alpha & O-III nebula details. Pair with an APS-C camera for 30s exposures (vs. 120s without) in Bortle 8 zones. Get studio-quality deep-sky shots from your backyard. Read More