OIII filters only allow light with a wavelength of 501 nanometers to pass through This wavelength is that of the doubly ionized oxygen spectral line (O-III) This line is emitted by planetary nebulae and some emission nebulae, so that with this filter, these objects remain visible while the rest is masked This effect increases the contrast and makes nebulae visible in low light.Astrophotography: it is best to use this filter with monochromatic cameras The ideal is to combine shooting through this filter with shots through H-alpha and SII filters
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