TS Optics Premium O-III Filter for observations of nebulae

The TS O-III Filter enhances contrast of planetary and other emission nebulae. This permits the observation of very faint objects even close to towns.

Principle of operation

The O-III Filter blocks unwanted light of streetlights and similar lighting and transmits the spectral lines of [O III] and H-alpha of nebulae almost completely. That enhances contrast tremendously and brings thousands of objects within reach of your telescope.

For which objects is this filter suitable?

The O-III Filer is well suited for emission nebulae, especially planetary nebulae. It lets light in the important [O III] range pass, and also at the H-alpha line. The contrast of objects like the North America nebula, the SNR Veil Nebula, and planetary nebulae like the Dumbbell Nebula is distinctly enhanced. Less known nebulae will become visible only with the filter.

On galaxies, nebular filters usually are of no use, as a galaxies show a continuous spectrum, which is blocked like stray light from lamps. The galaxy becomes dimmer proportional to the background.

For which telescopes is this filter suitable?

The OIII-filter can be used with all telescopes of at least 80 mm aperture. It is simply screwed into the filter thread of the eyepiece or the reducing adapter.

Delivery contents

• 2" O-III Filter in protective plastic box