More about the series Series 4000...
This Eyepiece offers a complete focal length range from 8mm to 24mm without sacrificing resolution compared to fixed focal length oculars.
It is an excellent addition to telescopes of all types, brands, and price levels from entry level to research grade. A terrific value, especially useful for terrestrial observation to zoon in on potentially moving wildlife.
Offers the ability to change magnifications "on the fly" yet demanding no compromise in performance. The eyepiece’s internal optics move on smooth, precisely machined surfaces which maintain optical collimation at all continuously variable zoom settings. The 6-element 4 group design has 15-18mm of eye relief, and provides an apparent field of view of 40° at 24mm, increasing to an apparent field of view of 60° at the highest power 8mm setting. All lenses are multi-coated for maximum light transmission and image contrast, while minimizing internal reflections.
Features a precision made 1.25" barrel, and fold down eyeguard for comfortable viewing and blocking stray light.
