Application Field: Machine vision microscopic inspectionIndustrial testing, especially electronic component testingscientific researchEducation industryThis zoom c mount lens is representing the standard main magnification 0.7X-4.5X, objective magnification 0.75X and TV magnification 0.5X.This product adopts the design scheme of limited far-conjugate distance optical system. Five basic modules are: continuous magnifying body, auxiliary objective lens, TV lens, bracket adapter and optional module.Optical parameters: Bulk ratio: 0.7X-4.5XSystem multiplier: 0.26X-1.69XNA: 0.012-0.053Working distance: 300mmDiagonal visual field: 22.86-3.56Matching camera size: 1/3inTips: The product may be updated constantly , Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect UseMaterial: Metal colour: BlackPackage Contents: 1 x LensOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.