ZWO OIII 7 nm Filter - 31mm - OIII7nmD31
Category: Telescope Accessories
ZWO 31mm OIII 7 nm Filter
This 31mm doubly ionized oxygen (OIII) filter, is made by ZWO and one of the most attractive narrowband imaging filters for astrophotographers. Moreover, if you use this filter with an SII filter and H-Alpha, you will notice increased contrast and enhanced coloring in your images, like the images taken by the Hubble Space Telescope. Planetary nebulae and supernova remnants emit most of their light in the OIII line, which is light in the blue/green, or teal portion of the spectrum near 500 nm.
The ZWO OIII 7nm 31mm Filter is unmounted. ZWO narrowband filters are fine-optically polished to reach an accuracy of 1/4 wave. Their performance is further enhanced by multiple layers of anti-reflection coatings.
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