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.
For all orders exceeding a value of 100USD shipping is offered for free.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item.
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