Magnification: 4X, 10X, 40X, 100X. es for Biological Microscope. Object field of view(on object, mm): 6.25, 2.5, 0.62, 0.25. Image square field of view(On image, mm): 25, 25, 25, 25. Focal Length(mm): 45, 18, 4.5, 1.8.
eBay