About this product
Part Number: 20239
A high-performance zoom eyepiece of top quality construction, providing a flat field of view and crisp, clear distortion-free images. Features 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 15mm.
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.
|Average Rating (1 Review): |Good but could be better!
Wednesday, 1 May 2019 | David
I use this eyepiece primarily for solar white light and Hydrogen Alpha observing. This inevitably requires the use of screw on filters which is a pain when switching between eyepieces of fixed focal length hence this item provides a solution. It provides me with more than satisfactory views whilst removing the need to move filters between eyepieces. The views are at least as good as the Revelation plossls I was using previously. So why 4 stars and not 5? Well I was disappointed at how stiff the zoom action is, I get there needs to be some resistance but I have to hold the eyepiece in two places to be able to zoom at all. It has loosened up a bit over the 4 weeks since I bought it and is a little better now but still stiffer than I would have liked. Overall though the views are good and I no longer have to switch eyepieces or move filters between them.
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