Explore Scientific 68° Series 16mm - 1.25" [ES-EPWP6816-01]

Explore Scientific: Scientific eyepiece, 16 mm focal length, visible field of 68 °,Barrel size 31.75 mm (1.25").
Over the past few years, the Explore Scientific eyepieces have forged a solid reputation in terms of quality and competitive rates. Looking in an eyepiece Explore is a pleasant and easy experience, the picture is beautiful from the first glance.
This eyepiece offers an apparent wide field of 68 °, high level optical quality, surprising light transmission and correctly corrected field planarity ...
The Explore Scientific 68 ° eyepiece range is well suited for the amateur astronomer looking for optical quality while remaining within a moderate budget. It is an excellent compromise for owners of telescopes with diameters between 150 mm and 300 mm. Observing the Orion nebula in these eyepieces through a Dobson telescope of 200 mm reserves very pleasant surprises.
Each eyepiece of the series 68 ° is sealed and filled with an inert gas, argon. This process prevents the formation of condensation inside the eyepiece and prevents the entry of dust to maximize the lifetime of the internal coatings.
All eyepieces in the 68 ° series are fully multilayered and the edges are blackened to produce maximum contrast.
The Explore Scientific 68 ° delivers sharp, contrasting images. The apparent field of 68 ° is relatively wide, allowing you to keep a celestial object observed in a non-motorized instrument long enough in sight.
The focal length of the Explore Scientific 68 ° eyepiece of 16 mm predestines it to medium to medium magnification (62x on an optical tube of 1 meter of focal length), making it very versatile both for planetary observations (Moon, planets, Sun) , As well as looking for details in nebulae and galaxies, while keeping a large field of view.
The eye relief of 16 mm is 11.9 mm: this means that the image remains comfortable up to 11.9 mm above the lens, to fully enjoy the field offered by the lens, ocular. This is an important detail for the viewer wearing eyeglasses, which will keep them on the nose.
Finally, it fits into the 1.25 "(31.75 mm) eyepiece holders. The inside of the sink is threaded in M28.5 x 0.6 mm to accommodate filters with 31.75 mm (1.25"), Such as interference filters of type OIII, UHC, H-Beta, etc., which serve to enhance the contrast on many nebulae.