Chroma Technology Bessell U Filter
Best precision optical tool for professional astronomical imaging specialists.
This photometric filter delivers precise ultraviolet transmission for demanding imaging applications. Its robust, single-substrate construction and hard-coated surface ensure exceptional spectral stability, even when facing significant environmental shifts.
$275.00
at
Deepspaceproducts
Who it's for
- Professional astronomers requiring precise ultraviolet light measurements
- Researchers operating in diverse or challenging environmental conditions
- Photometrists seeking reliable data for comparative stellar studies
Who should skip it
- Budget-conscious hobbyists looking for affordable entry-level equipment
- Users with standard CMOS cameras lacking significant UV sensitivity
- Aesthetic astrophotographers focused on creating beautiful deep-sky portraits
Performance breakdown
Spectral Stability
Hard-coated design resists drift from humidity and extreme temperature shifts.
Ghosting Suppression
Rear anti-reflection coatings effectively eliminate unwanted internal reflections.
Durability
Single-substrate construction avoids the degradation common in laminated filter designs.
System Integration
Parfocal design ensures seamless swapping without constant refocusing.
Photometric Precision
High-transmission accuracy delivers reliable data for serious scientific imaging.
Optical Compatibility
Optimized for fast optics, though limited to f/4 or slower.
Key Specs
Filter Type
Photometric
Filter Size
50.8 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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