1. Ophthalmic instruments. Trial frames. (15th August 1998) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (16 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. Optics and optical instruments. Application. Optical transfer function. Interchangeable lenses for 35 mm still cameras Part 1, (15th February 1995) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (12 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗