TS Optics Premium O-III Filter for observations of nebulae
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
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?
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
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
For which telescopes is this filter suitable?
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
- 2" O-III Filter in protective plastic box
Unwanted light is considerably suppressed, the emission of the nebula is transmitted almost undiminished - contrast rises