The opticron sdl v2 zoom eyepiece offers variable magnifications depending which scope it is mounted on and a comfortable eye relief of 20 18mm sdl eyepieces maximise the performance gains inherent in opticron ed objective lens fieldscopes at higher powers while maintaining superior cross field definition at all magnifications coupled with exceptional viewing comfort with an unrivalled combination of resolution and field of view the 40936 delivers the highest resolution of any opticron zoo