{"id":28633,"date":"2025-09-18T21:28:03","date_gmt":"2025-09-18T19:28:03","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=28633"},"modified":"2026-07-20T14:51:21","modified_gmt":"2026-07-20T12:51:21","slug":"optolong-ubvri-photometric-filter-set-2","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/optolong-ubvri-fotometrische-filterset-2\/","title":{"rendered":"Optolong UBVRI Photometric Filter Set 2\""},"content":{"rendered":"

Optolong UBVRI Photometric Filter Set 2\": measuring, not just making pretty pictures<\/strong><\/h2>\n\n\n\n

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).<\/p>\n\n\n\n

Because the bands follow the globally used standard, your measurements are directly comparable to professional data. Think of light curves of variable stars, exoplanet transits, or tracking supernovae.<\/p>\n\n\n\n

\"Optolong<\/figure><\/figure>\n\n\n\n

For the citizen scientist<\/h4>\n\n\n\n

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.<\/p>\n\n\n\n

Technology<\/h4>\n\n\n\n

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.<\/p>\n\n\n\n

Featured accessories<\/h3>\n\n\n\n

A five-position filter wheel accepts the complete set, allowing you to run measurement series without manual switching.<\/p>\n\n\n\n

For whom yes and for whom no<\/h3>\n\n\n\n