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 (2 Reviews): |
Friday, 6 December 2019 | Stephen
I bought this EP for 2 reasons:
1 As a travel EP to cova range of focal lengths.
2. To use with my Lunt Herschel wedge.
So far I've only used it with the wedge for white light solar paired with my ED 80.
The zoom function is very smooth and remains parfocal throughout with the exception of the 7.1. The eyecup rotates up with 3 solid clicks.
The image is sharp throughout.
Overall I'm really pleased with the quality and price. Fast delivery from FLO too.
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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