hara is the worlds leading manufacturer of optical glasses for use in astronomical applications. In addition to the extensive possibilities we have to manufacture all standard glasses in typically large required dimensions (for example, a spectrograph lens), we are also experts in the production of glasses with anomalous partial dispersion and excellent internal transmittance in the near UV range. One or more of Ohara's range of S-FPL (S-FPL51, S-FPL51Y, S-FPL52, and S-FPL53) glass types are very often specified in such optical designs.