Optolong UBVRI photometric filter set - unmounted
This photometric UBVRI set contains five filters in the dimensions Ø 36x2mm ultraviolet (U), blue (B), visual (V), red (R) and infrared (I). The set is made of quality branded glass, which is coated several times to ensure scratch resistance and exactly lying central wavelength by means of ion-beam-based deposition.
Brand glass from Germany as a substrate, 36mm diameter, 2mm thick
Multilayer antireflective coating applied by electron beam evaporation and ion beam assisted coating
Filter substrates polished optically on both sides up to 1/4 lambda and under 30 arc seconds non-parallelism
Polish quality 60/40 according to MIL-O-13830
Uniform and accurate coating method which ensures both high transmission in the passbands and high optical density in the off-band ranges
Each filter is supplied with a plastic box with EVA padding.
Please note that this filter may never be used as the sole sun filter!