![]() It has a usable eye relief of 13mm, excellent for an eyepiece in this focal length range. Combined with the twist-up eyecup design, the long eye relief makes it a good choice for eyeglass wearers. This new Astro-Tech 8mm Paradigm Dual ED eyepiece will make you rethink your expectations about just how good an 8mm eyepiece you can get for such a reasonable price - and make you wonder why other manufacturers can't do as well. I use this 8mm Dual ED Paradigm along with an 18mm Dual ED Paradigm in my 10" f/4.7 (1200mm FL) Dobsonian. Views are well resolved, and while I'm a beginner, I've noticed very little aberrations in either Dual ED Paradigm. And I'm very familiar with different types of aberrations from a terrestrial photography hobby. I personally think the solid retractable eye cup is more of a gimmick than a useful feature. It's easier to get to the right eye relief distance with more light blocking and less scope bumping with a soft rubber eye cup design. That said, it still does the job, it just requires a little more practice and careful movement than a soft eye cup. Overall it's very difficult to beat these eyepieces. I also have an Explore Scientific 24mm 82 degree eyepiece, and while the huge increase in FOV is noticeable, the views are roughly just as sharp in these little guys. ![]() I plan on buying more Dual EDs and rounding out my magnification range since I've had such a good experience with them. I have had four of these in various focal lengths for a few years, now just waiting for the 12mm to come in to complete the set.
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