TeleVue Nebustar UHC 1.25" - UHC Filter

TeleVue Nebustar UHC 1.25": UHC Filter: UHC Nebula Filter in 1.25 inch

The 1.25-inch Nebustar UHC is the all-round nebula filter in the TeleVue lineup: narrow enough to heavily suppress the sky background, wide enough to let all bright emission lines through.

For those looking for a single filter that works on as many nebulae as possible, this is the choice.

How a line filter gains contrast

Emission nebulae emit their light in a handful of narrow spectral lines. Light pollution and the natural airglow do not; they spread out over the entire spectrum. A line filter lets only the nebula lines through and blocks the rest.

The result is not a brighter image, but a darker background from which the nebula emerges. With a Dutch or Belgian sky, that difference is significant.

Type 2: Built by Astronomik to TeleVue specifications

For the Bandmate Type 2 line, TeleVue is collaborating with filter specialist Astronomik. The transmission bands lie exactly on the emission lines, with transmission in the passband exceeding ninety percent and a sharp cutoff outside of it.

The coating is polished and parfocal with TeleVue eyepieces, so focusing is hardly necessary after screwing it on. The filter housing has standard threads, making it compatible with any eyepiece with filter threads of the corresponding size.

The first nebula filter you buy

The Nebustar transmits a window that includes the H-beta line and both oxygen lines. This makes it work on virtually any emission nebula: from the Orion Nebula and the Lagoon Nebula to the planetary nebulae that the OIII filter also targets.

That width makes the UHC the logical first nebula filter. An OIII subsequently gains an extra step of contrast on specific oxygen targets, and an H-beta ultimately unlocks the handful of specialist targets.

Featured accessories

The filter screws into the filter thread of each eyepiece in the corresponding size, and therefore also into the TeleVue eyepieces from our range. For use with a 2-inch diagonal mirror, a 2-inch filter can be inserted directly into the mirror nose.

For whom yes and for whom no

• ✓ The first nebula filter in every collection
• ✓ Emission nebulae from Orion to the Lagoon
• ✓ Observing under a light-polluted sky
• ✗ Galaxies and star clusters, every nebula filter dims those
• If you only look at planetary nebulae, OIII wins.

Specifications

More filters can be found on the Telescope filters page. The complete lineup of this merk is available on the TeleVue merk Page.