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Unmounted round 36mm optical filter with dielectric coating

Baader Planetarium

Baader Planetarium UHC-L Ultra-L Booster Nebula 36mm optic

SKU CH-N2CE-BZBRJ

A 36mm nebula filter that blocks LED and street-light pollution while transmitting key emission lines for clearer deep-sky views

  • Enhanced contrast through Reflex-Blocker hard coating and dielectric layers
  • Optimal light pollution reduction via bandpass filter design
  • Versatile compatibility as unmounted 36mm round filter
  • Durable optical integrity with 2mm plane optically polished glass
  • Realistic star colours maintained while blocking LED emissions

What this filter does

The Baader UHC-L Ultra-L Booster Nebula filter is a 36mm round optic designed for visual and photographic observation of emission nebulae. It transmits the H-alpha, H-beta and OIII lines while blocking LED emissions, street-light glare and natural skyglow. The bandpass curve preserves realistic star colours. Astronomers working under light-polluted skies gain the contrast needed for deep-sky targets.

Behaviour during long sessions

The Reflex-Blocker hard coating and dielectric layers suppress internal reflections that build up during extended exposures, keeping background signal clean. CMOS-optimised coating technology blocks false light more effectively than earlier UHC designs, so stacked frames show less gradient and vignetting. The wide dual-band passbands maintain consistent transmission across the nebular lines without colour shift over time.

Build and mounting practicalities

The filter uses 2mm thick, plane optically polished glass for mechanical stability and wavefront accuracy. It arrives unmounted, allowing direct insertion into 36mm filter wheels, threaded cells or custom holders without adapter rings. The hard coating resists dew cycles and cleaning, while the round profile avoids vignetting in fast optical trains. Builders needing a mounted or larger-format filter must source a different unit.

Highlights

  • Enhanced contrast through Reflex-Blocker hard coating and dielectric layers
  • Optimal light pollution reduction via bandpass filter design
  • Versatile compatibility as unmounted 36mm round filter
  • Durable optical integrity with 2mm plane optically polished glass
  • Realistic star colours maintained while blocking LED emissions

Specifications

No published specifications for this item yet.

Questions about this item

Does the 36mm filter add heat or noise to the imaging train during all-night sessions?

The passive 36mm glass filter introduces no heat, noise, or power draw during extended use.

What thread or adapter must I already own to mount this unmounted 36mm filter?

You need a 36mm filter cell, threaded adapter, or filter drawer that accepts a 36mm diameter optic.

Will the 36mm UHC-L filter work with my older telescope and camera combination?

The 36mm unmounted design fits legacy focusers, filter wheels, and camera adapters that accept 36mm round filters.

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