Optolong UBVRI Photometric Filter Set 2″: measuring instead of just taking pretty pictures
Those who transition from astrophotography to science move into photometry: the precise measurement of star brightness. This set includes the five filters of the photometric standard system: U (ultraviolet), B (blue), V (visual green), R (red), and I (near-infrared).
Because the filters follow the globally used standard, your measurements are directly comparable to professional data. Think of light curves of variable stars, exoplanet transits, or following supernovae.
For the citizen scientist
With this set and a monochrome camera, you can provide measurements that are useful for international campaigns and observer networks. Educational institutions and observatories also use UBVRI sets for practicals and research.
Technology
Each filter consists of high-quality 1.85mm Schott glass, double-sided polished to lambda/4 with a polishing quality of 60/40. The multi-layer IBAD (ion beam assisted deposition) coatings are scratch-resistant, color-stable, and unaffected by temperature fluctuations.
Featured accessories
A five-position filter wheel accepts the complete set, allowing you to run measurement series without manual switching.
For whom yes and for whom no
- ✓ Variable star and exoplanet transit observers
- ✓ Observatories, societies, and educational institutions
- ✗ If you want to take purely aesthetic astrophotography photos: an LRGB set is the right choice for that
Specifications
| Content | U, B, V, R, I (photometric standard bands) |
| Size | 2 inch (M48 x 0.75) |
| Glass | Schott, 1.85 mm, double-sided polished lambda/4 |
| Polishing quality | 60/40 (MIL-O-13830) |
| Coating | Multi-layer IBAD, scratch-resistant, and temperature-stable |
| Observation goals | Photometry, scientific measurements |
You can find more accessories for this brand at the Optolong brand page.
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