Haag Streit BQ 900 Slit Lamp   The BQ 900, due to its excellent optics, versatility and ease of operation, has become the standard for those requiring advanced slit lamp microscopy. A universal, modular system, offering simultaneous video and still photography through either professional or consumer level cameras. A range of optional accessories include a teaching scope, inclined eyepieces and, for retinal specialists, the unique stereo variator. As with all Haag-Streit slit lamps, a Goldmann tonometer – the gold standard in IOP measurement – may be added to the system. Binocular microscope - parallel optical path High resolution and depth of focus Adjustable length of the slit image   Slit lamp illuminator     Slit image width 0 - 8 mm continuous Slit image length 1 - 8 mm continuous Illumination field diameter 8, 5, 3, 2, 1, 0.2 mm Test mark with fixation star Slit image radial range ± 90° Radial movement of the slit light illumination relative to the microscope axis horizontal ± 90°, vertical 0 - 20° Filters blue, redfree (green), grey (10 %), UV and IR filters permanently installed Light source Tungsten incandescent light bulb 6 V / 4.5 A Illumination intensity 150 000 Lux at position 1/2 300 000 Lux at position 1 600 000 Lux at position 2     Stereo-microscope       Objective lens focal length 105 mm Magnification changer 6.3x 10x 16x 25x 40x Ocular magnification 12.5x Range of adjusting eye-pieces + 8 to -8 diopters Inter pupillary distance 52 - 78 mm     Instrument base       Operation Single handed 3-dimensional operation of the guide lever Adjustment of the instrument base 80 mm (length), 30 mm (height), 100 mm (side) Weight 12.76 kg (without transformer and headrest)