The TS O-III filter significantally enhances the contrast of planetary and gas nebulae, thus allowing observation of faint objects even in the suburbs of bigger cities.

Because of direct purchase from the manufacturer, we can offer this high-quality filter for a very interesting price.

How does the TS O-III filter work?
Countless lights from urban sources reduce the possibilities of astronomical observation. The TS O-III Filter blinds out these parts of the spectrum and lets the wavelengths of O-III and H-a light pass. So it enhances the contrast of these objects in relation to the background.

For which objects is this filter suitable?
The TS O-III filter is especially designed for gas- and planetary nebulae. Famous objects like the Dumbell, Cirrus and North America Nebula can be observed much better. The observation of minour nebulae is often only possible by using an O-III filter.

For which telescopes is this filter suitable?
We recommend this filter for all kinds of telescopes with an aperture of 90mm and bigger. It is easily screwed into the filter thread of an 1.25" eyepiece.

The difference - View without filter / UHC filter / O-III filter... on M27
The pictures show the view through a medium amateur telescope under average conditions.

These pictures illustrate the effect of the O-III filter and are also a useful comparison between O-III and UHC filter. From our point of view, the O-III filter is not a replacement but an addendum to the UHC filter. The O-III filter brings extreme contrast enhancement but darkens background objects and "swallows" fainter stars. The overall impression is alienated but faint detail in the desired object itself are better visible.

Scope of delivery:
-- 1.25" interference O-III filter
-- Metal socket with filter thread on both sides
-- Robust plastic storage and transport case