Astrodon Sloan u' Photometric Filter - 50mm Unmounted
Astrodon
Sloan Photometric Filters - 50mm Unmounted / u' edge-blackened (320/385nm) is a multi-band nebula filter in 50mm for nebula imaging and light-polluted skies.
Best Current Offer
Specifications
Filter
- Filter type
- Sloan photometric filter
- Filter size
- 50 mm / Unmounted
- Transmission
- 95%
Spectral
- Passbands
- Sloan u 320-385 nm
- Band count
- 1 band
Use
- Camera use
- Color or mono astronomy cameras, depending on target and workflow
Astrophotography Fit
Best for emission nebulae with one-shot color cameras, especially from light-polluted skies.
Sloan Photometric Filters - 50mm Unmounted / u' edge-blackened (320/385nm) is a midrange multi-band nebula filter (50mm).
Best for emission nebulae with one-shot color cameras, especially from light-polluted skies.
Choose filter size around the sensor diagonal, telescope speed, and filter-wheel or drawer geometry. Flats are still required; a filter can improve contrast, but it will not rescue tilt, bad focus, or poor calibration.
Best paired with
- One-shot color cooled cameras or modified DSLRs
- Emission nebulae rich in H-alpha, OIII, SII, or H-beta signal
- Filter drawer or wheel sized to avoid vignetting
Not recommended for
- Broadband galaxies, reflection nebulae, or clusters as the main use case
- Monochrome SHO workflows that need separate channels
- Very fast optics unless bandpass shift and halos have been checked
Where To Buy
Some links on this page are affiliate links. Prices and availability are pulled automatically from each retailer and updated daily.
| Retailer | Price | Availability | View Offer |
|---|---|---|---|
| Cloud Break Optics Cloud Break Optics | $256.30 | Out of stock Updated 8/5/2026 | View Offer - $256.30 |
Price History
Chronological retailer pricing with out-of-stock points shown at reduced opacity.