Working distance 2.1-1.5 mm depending on correction collar position. Correction collar 0.5-1.5. See my other listings for more objectives.These will be your responsability. This item is in the category "Business, Office & Industrial\Healthcare, Lab & Dental\Medical/Lab Equipment Attachments & Accessories\Microscope Parts & Accessories\Microscope Objectives". The seller is "yopino" and is located in this country: GB. This item can be shipped to United Kingdom.