Product Description
The latest computer design programs have been used to optimize its performance. Its seven element/four group design uses low dispersion and high refractive index lenses and full multicoatings for high contrast, high resolution, and flat field images across a very wide 82° field of view. The lens edges have been blackened to improve contrast.
The 8.8mm 82° Explore Scientific works with any telescope, from a fast focal ratio reflector, to a catadioptric, to a long focal length refractor. With an 8" Schmidt-Cassegrain, for example, it gives you 227x, a 0.88mm exit pupil (very close to the 1mm exit pupil recommended for high magnification observing under average to good seeing conditions), and a 0.36° field of view (about three-quarters the diameter of the full Moon). With a 10" f/4.5 Dobsonian, it gives you 129x, a generous 1.95mm exit pupil suitable for nebula observing, and an equally generous 0.64° field of view (more than one and a quarter times the diameter of the full Moon). You can use the calculator in the "formula" tab above to see just how wide the field will be with your particular telescope.
At 14mm, the eye relief is surprisingly good for an eyepiece in this focal length range, although eyeglass wearers will still see a somewhat vignetted image. This isn't as much a problem as you might think, as the 82° field of view is so wide that even non-eyeglass wearers have trouble seeing the whole field at once. This is an eyepiece that shows you a "picture window view" of space for a true full-immersion observing experience. With its unconstricted view, your eye relaxes, allowing you to easily use the "averted vision" technique to study faint details across a huge field of view.
The eyepiece has a soft fold-down rubber eyecup and comes with dust covers for both ends of the eyepiece.
This individually serial numbered Explore Scientific eyepiece is backed by a limited one year warranty, which will be extended to an Explore Scientific transferable lifetime limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase. This link will take you to full details on this unique transferable lifetime warranty.
Tech Details
| Barrel Size | 1.25" |
|---|---|
| Eye Relief | 14mm |
| Field of view | 82 |
| Focal Length | 8.8mm |
| Number of optical elements | 7 |
| Weight | 8 oz. |
| Warranty | 1 year, extendable to lifetime |
Reviews
One thing to note is that the usable eye relief is shorter than advertised, due to the recessed eye lens. I would say it is more like 11-12mm. I can see the whole field of view but really have to push into the rubber eyeguard. This is NOT an eyepiece for people who wear glasses at the telescope. (Posted on 9/21/2019)
(Posted on 1/4/2019)