Application Field: Machine vision microscopic inspection<br> Industrial testing, especially electronic component testing<br> scientific research<br> Education industry<br> This zoom c mount lens is representing the standard main magnification 0.7X-4.5X, objective magnification 0.75X and TV magnification 0.5X.<br> 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.<br> Optical parameters:<br> Bulk ratio: 0.7X-4.5X<br> System multiplier: 0.26X-1.69X<br> NA: 0.012-0.053<br> Working distance: 300mm<br> Diagonal visual field: 22.86-3.56<br> Matching camera size: 1/3in<br> Tips: The product may be updated constantly , Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use<br> Material: Metal<br> colour: Black<br> Package Contents:<br> 1 x Lens<br> Only the above package content, other products are not included.<br> 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.