Magnification: 5X, 10X, 20X, 50X. Optical working distance: 5X-23.6 10X-17.8, 20X-5 50X-3.11. This series objectives are designed specially used for Nikon Industry Microscope LU series. Could instead of CFI-60 Plan Fluor semi-apo objectives.It's a substitute product, Not copy. Standard protective packing: Special plastic bottle. Apply for microscope of infinite corrected optical system with tube lens FL 200mm, such as nikon CFI-60 optical system. This objective could be used as a substitute objecive lens of Nikon CFI-60 Plan Fluor semi-apo objective lens. DIN 60mm standard, All optics are AR coated between 400nm700nm. 20x, 50x and 100x objectives have spring-loaded(retractable) front ends. (b) Through no fault of our deliveryman, they are not able to unload or deliver the item (such as there being no person to assist if the product is large or heavy). We only accept the return for original package. Please make sure the item have NO man-made sabotage. All products are rigorously tested before leaving the factory, if products received damaged or with quality problems, please do not hesitate to inform us with a photo that can be used as evidence. We are always looking to bring new and innovative items to our catalog, so contact our Customer Service department with any suggestions you may have! The item "Metallurgical Microscope Infinity Plan Achromatic Objective Lens for Nikon M25" is in sale since Friday, August 16, 2019. This item is in the category "Toys & Hobbies\Educational\Science & Nature\Microscopes & Chemistry". The seller is "outdoor2015" and is located in , . This item can be shipped worldwide.