Chroma Technology Bessell U Filter
Best precision optical component for dedicated astrophotography enthusiasts.
Engineered for precision photometry, this filter utilizes durable, single-substrate construction to ensure consistent performance. Its hard-coated design resists environmental drift, making it a reliable choice for demanding astronomical imaging applications.
$275.00
at
Highpointscientific
Who it's for
- Professional astronomers seeking maximum signal-to-noise ratios in ultraviolet observations.
- Researchers needing long-lasting equipment for remote or harsh observatory environments.
- Scientists requiring standardized data for comparative stellar and galactic studies.
Who should skip it
- Budget-conscious amateur observers or students on limited institutional grants.
- Astrophotographers using standard front-illuminated sensors with poor UV response.
- Urban observers or those located in humid, low-altitude environments.
Performance breakdown
Spectral Stability
Passbands remain rock-solid despite harsh environmental temperature or humidity shifts.
Ghosting Suppression
Rear anti-reflection coatings effectively eliminate distracting internal light reflections.
Build Durability
Sputtered hard coatings ensure long-term resilience against wear and tear.
System Integration
Parfocal design allows for seamless swapping without constant focus adjustments.
Optical Clarity
Single-substrate glass construction provides exceptional light transmission and image sharpness.
Focal Compatibility
Optimized for f/4 or slower systems, limiting use on extremely fast scopes.
Key Specs
Filter Type
Photometric
Filter Size
31.75 mm
Filter Shape
Round
Filter Insert Style
Threaded
Wavelength Range
320 nm - 397 nm
Bandwidth
77 nm
Optical Thickness
3 mm
Compatibility
Focal ratios of f/4 or smaller
Know before you buy
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