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Home Eyepieces Zoom & Guiding Eyepieces Helios HyperFlex 7E 7.2 - 21.5mm Zoom Eyepiece
A high performance zoom eyepiece of top quality construction for any telescope, providing a flat field of view and crisp, clear distortion-free images. Features include a continuous focal length of 7.2mm to 21.5mm and a corresponding apparent field of view of 60°-40°. For convenience, focal length positions of 7.2, 10, 13.5 & 21.5mm are engraved on the eyepiece barrel. The zoom is super-smooth to operate and a pleasure to use. Eye relief is 15mm allowing comfortable viewing even high magnifications. Constructed with 7 lens elements in 4 separate groups. This exotic eyepiece model features a generous sized eye-lens element and soft twist-up rubber eyecup for comfortable viewing. Fully broadband multi-coated, features blackened lens edges, internal baffling and is parfocal. Beautifully finished in high-gloss anodized aluminium with knurled rubber grips. Threaded to accept standard 1.25" filters. Weight approx 190g.
Good quality and use all the time. Great service Used on Sky-Watcher Star Travel Refractor 120 (f5). AFOV ranges from 40° at the 21.5mm (power 28x) giving TFOV 1.4° setting to a wider AFOV 60° when set to 7.2mm (power 83x) giving TFOV 0.7°. Compared very well to my fixed Super Plossl eyepieces. In fact, I would say even better. (18/11/2023) Peter - Warwick
Excellent choice for Lunt LS50 Bought this for my Lunt H-alpha solar scope, as my Baader zoom wouldn’t come to focus. No obvious difference in performance to my Baader. The zoom action is smooth and continuously variable, and I like the lack of click-stops. Excellent value, superbly swift and efficient service from Harrisons. (25/12/2020) -
Excellent quality at an extremely good price Primarily bought this for use with my Lunt50/350 bp 400. It is identical to the Lunt eyepiece n all but name. However it is significantly cheaper. Well made, smooth operation and crystal clear viewing at all settings. Very comfortable on the eyes. (29/03/2019) David - Swindon
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