Description
CCD version of the OIII filter made for Canon EOS cameras.
The Astronomik OIII-CCD filter, is designed for CCD imaging of gas and planetary nebulae. Due to the narrow bandpass of the OII line at 501 nm, the filter provides maximal increase in contrast even under poor observing conditions. The 13 nm bandwidth allows us to achieve transmission as high as 97%–a value that is impossible to reach with filters of narrower bandwidth.