Optolong UBVRI photometric filter set 1.25''

Optolong UBVRI photometric filter set - mounted. This UBVRI photometric filter set consists of five filters in a 1.25" or 2" round cell: ultraviolet (U), blue (B), visual (V), red (R), and infrared (I). This set is manufactured using high-quality branded glass with ion-assisted deposition multi-layer coating, which guarantees extreme scratch resistance and ensures the stability of the central wavelength. The set is designed for use with filter wheels, with both 1.25" and 2" slots. Quality materials: German-manufactured branded glass substrate, 1.85 mm thick. Multi-layer anti-reflection coating, deposited via electron-beam evaporation and ion-assisted deposition. Quality finishes: Substrate with precision optical polishing down to 1/4 lambda and <30 arcseconds of parallelism on both sides. 60/40 polish quality according to MIL-O-13830 specifications. Uniform and precise coating method ensuring high passband transmission and precise off-band blocking. Each filter comes with a plastic case with EVA padding. Warning: this filter must never be used alone for observing the Sun! Warning: this filter must never be used alone for observing the Sun!

Main features

Optolong quality for a reliable and satisfying observation experience.

• Type: Filter
• Material: Schott glass
• Optical coating: multiple
• Mount: 1.25"
• Transmission: 70
• Surface accuracy: 1/4

Main technical specifications