{"product_id":"test-equipment-l-tstop-eval","title":"Lindsey Optics T-Stop Evaluation System with Acquisition Software","description":"\u003cp\u003eLindsey Optics T-Stop Evaluation System with Acquisition Software\u003cbr\u003e\nCine lenses must be marked in T-Stops (Transmission Stops) and the accuracy of those marks is paramount.\u003c\/p\u003e\n\n\u003cp\u003eWhether it is to validate aperture markings following the maintenance of a cine-lens or to measure and engrave the aperture values on a re-housed photographic lens that was originally marked by the manufacturer in f stops, a precise and easy-to-use T-Stop meter is required.\u003c\/p\u003e\n\n\u003cp\u003eWe have developed a new generation of T-Stop tester using recent technologies to make the professional's life easier by removing interpretation. Our T-Stop Evaluation system displays the T-Stop values directly on the screen without the need to convert from exposure values.\u003c\/p\u003e\n\n\u003cp\u003eThe system can be used immediately after power on, there is no warm-up period required. The system is calibrated each time it is turned on using the included Calibration Aperture. It can also be re-calibrated if needed.\u003c\/p\u003e\n\n\u003cp\u003eThe very bright LED light source is aimed up into an integration sphere where the light reflects off the walls of the sphere multiple times to produce a highly uniform source. The high brightness and extreme uniformity of the Integrating Sphere light source on our T-Stop Tester provides high precision at small lens apertures (large T-Stop values). The illumination is stable and will not vary over time.\u003c\/p\u003e\n\n\u003cp\u003eThe counter-weighted integration sphere is moved manually and can be locked in place during measurement.\u003c\/p\u003e\n\n\u003cp\u003eThe vertical configuration with 18 x20\" baseboard conserves bench space.  All of the electronic components and display are on the baseboard, there's no external box to sit on the bench and consume more space.\u003c\/p\u003e\n\n\u003cp\u003eThe T-Stop Evaluation System is shipped with an LPL mount and our PL-to-LPL adapter to provide secure mounting of cine-lenses and repeatability of the measurements.\u003c\/p\u003e\n\n\u003cp\u003eAvailable adapters to other lens mounts can be used to evaluate and validate T-Stop values.\u003c\/p\u003e \n\n\u003cp\u003eAcquisition Software:\u003cbr\u003e\nOur T-Stop Evaluation System Acquisition Software is connected to the system via a USB port.  The software allows rapid data collection of marked T-Stop values from finished lenses.  It's designed to allow collection of data from closed to open and then from open to closed.  The difference between the measured values shows any lost motion in the iris mechanism.\u003c\/p\u003e\n\n\u003cp\u003eData can be exported to a spreadsheet in .csv comma separated format.\u003c\/p\u003e\n\n\u003cp\u003eThe data is still displayed on the system touchscreen when the Acquisition software is being used.\u003c\/p\u003e \n\n\u003cp\u003et-stop-software.jpg\u003c\/p\u003e\n\n\u003cp\u003eSpecifications:\u003cbr\u003e\nLight Source\u003c\/p\u003e\n\n\u003cp\u003eColor temperature approximately 6300K (Daylight)\u003c\/p\u003e\n\n\u003cp\u003eApproximately 5500 lux @ T 1.0.\u003c\/p\u003e\n\n\u003cp\u003eCounterweighted 300mm Integrating Sphere.\u003c\/p\u003e\n\n\u003cp\u003eOn\/Off switch for the Integrating Sphere.\u003c\/p\u003e\n\n\u003cp\u003eElectronics\u003c\/p\u003e\n\n\u003cp\u003e4.3 inch Color Touchscreen interface.\u003c\/p\u003e\n\n\u003cp\u003eDisplays T-stop values directly. No conversion table needed.\u003c\/p\u003e\n\n\u003cp\u003eRange: T1.0 to T22.0 by 1\/6 stop increments.\u003c\/p\u003e\n\n\u003cp\u003eExposure value (EV) and illumination (lux) can be displayed.\u003c\/p\u003e\n\n\u003cp\u003eResolution – T-Value : 0.1\u003c\/p\u003e\n\n\u003cp\u003eResolution – EV : 0.1\u003c\/p\u003e\n\n\u003cp\u003eAccuracy: +\/- 0.05\u003c\/p\u003e\n\n\u003cp\u003eLens mount interface\u003c\/p\u003e\n\n\u003cp\u003eCalibration Aperture included.\u003c\/p\u003e\n\n\u003cp\u003eLPL mount and PL-to-LPL adapter included.\u003c\/p\u003e\n\n\u003cp\u003eRED Monstro camera interface used.\u003c\/p\u003e\n\n\u003cp\u003ePanavision SP70 mount available (option).\u003c\/p\u003e\n\n\u003cp\u003eMetal PL and LPL Lens Caps are included.\u003c\/p\u003e\n\n\u003cp\u003eDimensions\u003c\/p\u003e\n\n\u003cp\u003eOverall dimensions (W x D x H): 458 mm x 508 mm x 860 mm\u003c\/p\u003e\n\n\u003cp\u003eOverall dimensions (W x D x H): 18 in x 20 in x 34 in\u003c\/p\u003e\n\n\u003cp\u003eSystem mass: 16 kg (36lbs)\u003c\/p\u003e\n\n\u003cp\u003eMaximum lens length: 650 mm from PL flange (longer lenses available upon request).\u003c\/p\u003e\n\n\u003cp\u003eMaximum lens front diameter: 136mm.\u003c\/p\u003e\n\n\u003cp\u003eMechanical opening of sphere aperture: 138mm.\u003c\/p\u003e\n\n\u003cp\u003eAC Power Input: 100V-240V ~ 1.6A 50-60Hz\u003c\/p\u003e\n\n \n\n\u003cp\u003eSubject to change.\u003c\/p\u003e","brand":"Lindsey Optics","offers":[{"title":"Default Title","offer_id":67975220232344,"sku":"L-TSTOP-EVAL","price":18000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0458\/8853\/6728\/files\/TSTOP_BOX_1000px__59734.1712455809.500.750.jpg?v=1794434915","url":"https:\/\/newcircuit.com\/products\/test-equipment-l-tstop-eval","provider":"New Circuit","version":"1.0","type":"link"}