Baader O-III Highspeed(f/2) Ultra-Narrowband 4nm (CMOS-Optimized)
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Baader O-III Highspeed(f/2) Ultra-Narrowband 4nm (CMOS-Optimized)

baader-planetarium.com/.../baader-o-iii-f2-ultra-highspeed-filters-(4nm)-%E2%80%93-cmos-optimized.html
TypeOxygen-III (OIII)
Bandwidth4 nm
SizeOther
Users 70
Images 382
Most often used with
ZWO ASI2600MM Pro
Also available in the following variants:
1.25"
2"
31 mm
36 mm
50 mm
50x50 mm
65x65 mm