Description This objective has a low magnification and is suitable for use on a microscope turret when scanning a large area to locate targets. Specifications: 2.5 X L PLAN achromatic objective Working distance:11.2mm RMS thread，4/5X1/36″ NA value 0.08 infinite system F 180mm Image-side FOV 22mm Parfocal distance 45mm Please note that the image circle of this objective lens is 22 mm in diameter. When used with a full-frame camera, it will exhibit slight vignetting, but there is no vignetting when paired with an APS-C camera. A vignetting demonstration image is shown below. Single frame on full frame camera
