This listing is for a Sutter Instrument Company Lambda DG-4 W Light Guide, Microscope Adapter This includes the following: Sutter Instrument Company Lambda DG-4 Liquid Light Guide Microscope Adapter (At this time I don't know what microscope this fits on). The diameter of the microscope adapter is 43.4mm. 175 Watt Lamp inside (with 919 hours according to the lamp hours counter. Power Cord Instruction Manual Description: I have powered this up and verified that I could see light coming through the liquid light guide. At the time I did not have the instruction manual so I was unsure how to operate it. According to the Sutter site, the DG-4 sells for $21,310.00. New bulbs are $670. This has 2 filter holders included. 2 more could be purchased for $95 each and this looks to be missing the ND filter holder (on the left side where the other filters are). This ND Filter Holder is also $95. The Lambda DG-4 is a complete illumination system offering speed and versatility for experiments requiring rapid wavelength switching. The instrument retains all the advantages of interference filter based systems, yet eliminates the temporal constraints imposed by traditional filter changing devices like filter wheels. Switching between any two wavelengths is achieved in less than the 1.2msec vertical retrace period of a video signal, allowing the user to perform real-time video imaging. The high switching speed of the Lambda DG-4/DG-5 Plus facilitates the ability to follow fast changes in ion concentrations in dual wavelength ratio imaging applications and to monitor other concomitant changes in the studied system at additional wavelengths. Narrow bandpass systems, such as single cavity interference filters, grating monochromators, and A.O. modulators, pass unwanted harmonics of the desired wavelength. Also, with variable wavelength devices, it is not always possible to obtain sufficient blocking of out-of-band wavelengths. Modern interference filters, as used in the Lambda DG-4/DG-5 Plus, do not pass harmonics and have integral blocking characteristics 1000 times better than typical monochromator systems. For the same full width at half maximum (FWHM), interference filters have a narrower spectral bandpass due to the absence of the slit function. The dual galvanometer design of the Lambda DG-4/DG-5 Plus allows tuning of the relative intensities at each wavelength. This adjustment, in variable wavelength devices with a single optical path, is difficult to obtain. Unlike monochromators and other wavelength selective systems, the Lambda DG-4/DG-5 Plus can be used as a source of white light when required. How it works: This unique optical design of the Lambda DG-4/DG-5 Plus is based on dual scanning galvanometers utilizing interference filters for wavelength selection. The light from the xenon arc lamp is focused on the first galvanometer mirror which directs it via a parabolic mirror, through one of the interference filter channels. Following the filter, a second parabolic and a second galvanometer mirror collect and redirect the light into the light guide. A cold mirror in the beginning of the light path eliminates the IR radiation, reducing significantly the amount of heat absorbed by the optics and the sample. Cold mirrors modified to pass near-IR to 780 to 880nm are also available. A built-in shutter function allows reduction of light intesity by six orders of magnitude. For applications requiring mechanical shuttering, like time lapse experiments or very sensitive samples, the SmartShutter® can be integrated into the device to assure that the light is completely blocked. The standard system, the Lambda DG-4 Plus, holds up to four 25mm interference filters. The Lambda DG-5 Plus, a five filter version, accommodates three 18mm and two 25mm filters. While the switching time between any two wavelengths is done in less than 1.2msec, the dwell time at any wavelength is arbitrarily set by the user. The Lambda DG-4/DG-5 Plus provides 0.5msec switching times between adjacent filter positions and 20% greater light output. FEATURES The Lambda DG-4 / DG-5 Plus is a complete integrated 300 Watt light source and wavelength switching excitation system Four or five interference filters can be easily installed in the DG-4 or DG-5 Plus, respectively. An additional standard neutral density filter can be inserted in the common path of the light The light guide output from the Lambda DG-4 / DG-5 Plus provides uniform spatial illumination, as well as vibration isolation from your microscope A cold mirror assembly eliminates IR radiation, extending the lifetime of the optics and the light guide and preventing the exposure of the sample to IR when white light is necessary INTEGRAL SHUTTERING The Lambda DG-4 /DG-5 Plus provides a high speed shutter function with open/close times of 500µs. The shutter function reduces light intensity by 5 to 6 orders of magnitude. If complete light shuttering is required, a mechanical shutter (i.e. SmartShutter® can be incorporated into the Lambda DG-4 / DG-5 Plus INTEGRAL NEUTRAL DENSITY FILTERING Neutral density filtering is achieved by offsetting the output galvanometer such that light is not centered on the liquid light guide. Up to 15 logical filters can be defined with this method. Due to the scrambling effect of the light guide, the output has excellent uniformity. Direct insertion of neutral density optical filters is also possible in the filter holders at any of the four optical channels. A final neutral density optical filter can be placed in the exiting light path which will reduce the light output from all optical channels. TWO OUTPUTS FOR MONITORING FILTER POSITION - A 4 bit TTL signal transmits the current optical channel (filter) position. A digital-to-analog converter (DAC) output produces a voltage showing which filter is in use. TURBO BLANKING The turbo blanking feature is designed for situations when the switching is done between non-adjacent filter positions. When the instrument is in this mode, the input and output galvanometer mirrors move out of sync, thus preventing the sample from being exposed to light of unwanted wavelength during switching and shuttering. DIRECT COMPUTER CONTROL - Computer control of the instrument is possible via parallel or serial port. TECHNICAL SPECIFICATIONS Lamp Type 175 Watt pre-aligned, ozone free xenon arc bulb Output Range 330nm to 700nm - ozone free Lamp Lifetime Expected lifetime 1,000 hours (All bulbs have a prorated warranty for 500 hours) Power Consumption 350 Watts Filter Diameter DG-4: Four, 25mm (1inch) Dimensions 10in x 10in x 19in | 25cm x 25cm x 48cm Light Guide 2 meters long 3mm diameter Weight 45lbs | 20kg Electrical 110-120 VAC 60 Hertz power line Documentation and Links: Link to the Manual on the Sutter Instruments site Link to the Sales Flyer on the Sutter Instruments site Link to the Price List on the Sutter Instruments Web Site Link to how to change the lamp Free shipping in the USA. More pictures of the unit: If you receive your item and it is not to your 100 Percent Satisfaction, please contact us before leaving feedback. I strive to make sure every transaction is a positive one! 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