Orders placed after 4PM on weekdays will not ship until the next business day. Orders placed after 11AM Fridays will not ship until the following Monday.
Faster shipping methods may be available; just upgrade during checkout.
*Some exclusions apply.
Enter new zip code to refresh estimated delivery time.
Intended for dark sky observation of emission and planetary nebulae, especially the Veil Nebula, the O-III Filter from MrStarGuy is compatible with telescopes featuring a 1.25"-diameter eyepiece. This filter is designed to only pass the two wavelengths of ionized oxygen, at 495.9nm and 500.7nm, in order to better discern fine details and clarity. In addition to visual observation, this filter is also ideally suited for digital astrophotography applications, especially in conjunction with an IR block filter, as well as some bright sky viewing of nebulae.
In the Box
MrStarGuy 1.25" O-III Filter
Plastic Filter Case
Limited 5-Year Warranty
Table of Contents
1.25" / 31.75 mm (diameter)
H-Beta (486.1 nm): 61.05% O III (495.9 nm): 96.72% O III (500.7 nm): 94.24% H-Alpha (656.3 nm): 0.17%