Astronomik 1.25″ UHC-E Filter

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Astronomik 1.25″ UHC-E Filter

Article No.: 16767
Manufactured by: Astronomik
Shipping weight: 0.07 kg

Our price: 96.50 €

1-2 weeks

We do not have the goods physically with us, but it is available from a remote supplier. In this case, we order them immediately and therefore it may take several weeks before we are able to send them to you.

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This product is available in the following variants:
Astronomik 1.25″ UHC-E Filter	96.50 €
Astronomik CLS 1.25″ Broadband Light Pollution Filter	102.45 €
Astronomik UHC 1.25″ filter	131.20 €

Enhanced Urban Observation Filter for Small Telescopes

The **Astronomik UHC-E filter** represents the perfect balance between contrast enhancement and light transmission, specifically designed for observers using smaller telescopes in urban environments. With its FWHM of 45nm, this filter effectively blocks unwanted artificial lighting from street lamps, sodium vapor lights, and mercury vapor sources while maintaining excellent star visibility.

Key Features and Benefits

Superior Light Transmission

Transmits up to 94% of desired light
Passes wavelengths from 480nm to 525nm and above 645nm
Enhanced star visibility compared to standard UHC filters
Ideal for telescopes with apertures up to 5″ (127mm)

Advanced Optical Design

1mm glass thickness for minimal optical distortion
Parfocal with other Astronomik filters
Diffraction-limited performance maintains telescope's optical quality
Multi-layer interference coating technology

Versatile Applications

Visual Observation

The UHC-E filter excels in **urban astronomy conditions**, providing excellent performance for telescopes with apertures up to 125mm. While standard UHC filters may be preferable under dark skies, the UHC-E shines in light-polluted environments where maximum light gathering is crucial.

Astrophotography Excellence

DSLR compatibility: Near-perfect color balance with original and modified cameras
Film photography: Excellent results with extended exposures
CCD imaging: Outstanding performance when combined with IR-blocking filters
Webcam deep-sky imaging: Exceptional results in high light pollution areas

Specialized Observations

Jupiter's atmospheric features and cloud bands
Enhanced double star separation
Comet observation (carbon spectral line transmission)
Emission nebulae under urban skies

Technical Specifications

Optical Performance

FWHM: 45nm
Light transmission: Up to 94%
Bandpass: 480-525nm and >645nm
Filter thickness: 1mm precision optical glass

Construction Quality

High humidity resistance
Scratch-resistant surface
Age-resistant coatings
Professional aluminum cell construction
Supplied in premium protective case

Filter Selection Guide

For telescopes larger than 5″ (127mm), consider the standard Astronomik UHC filter for maximum contrast enhancement. Observers with 8″ (200mm) telescopes may benefit from the specialized Astronomik OIII filter for specific nebulae types. The UHC-E represents the optimal choice for smaller instruments where light gathering capability is paramount.

Professional Recommendations

Optimal Use Conditions

Urban and suburban observing sites
Telescopes up to 5″ aperture
DSLR astrophotography in light-polluted areas
Medium exit pupil distances

Performance Ratings

Visual observation (dark sky): Good - UHC preferred
Visual observation (urban): Excellent for small telescopes
DSLR photography: Excellent color balance
CCD imaging: Excellent with IR blocking
Deep-sky webcam: Outstanding in light pollution

The Astronomik UHC-E filter transforms urban astronomy by effectively managing light pollution while preserving the natural beauty of celestial objects. Its carefully engineered spectral response ensures that both visual observers and astrophotographers can achieve remarkable results even from city locations.