A premium zoom eyepiece of superior optical quality and craftsmanship.
This high quality zoom eyepiece delivers a particularly flat field of
view, exceptional contrast and excellent colour rendition. It is
recommended for astronomical and terrestrial use as well as for Solar
observing with an appropriate telescope. If you own a smaller Solar
telescope like the Coronado PST then the smaller and lighter
Opticstar XL 7.2mm-21.5mm ZOOM would
also be worth considering.
The eyepiece provides an apparent field of view of 66°-42° and continuous
focal lengths between 7.5mm and 22.5mm, this range particularly suits
SCT type telescopes that will operate at their highest magnifications
at around 7.5mm under reasonable conditions. When used in conjunction
with a 2x barlow the eyepiece will reach the maximum possible
magnification for a f4.8 Newtonian telescope thus making it very
versatile with a variety of telescopes of different optical designs,
focal lengths and focal ratios.
The excellent mechanical construction and finish when combined with a
substantial eye relief of 18mm-19.5mm and an adjustable twist-type
eye cup make these eyepieces very comfortable to use. In addition the
eyepiece is parfocal and as such there is no need to refocus when
The eyepiece’s advanced optical train consists of eight lenses in
five separate groups, all optical surfaces are broadband fully
multi-coated and all lenses feature blackened edges, the eyepiece
also benefits from internal baffling. These features reduce internal
reflections to an absolute minimum and help to significantly increase
The Eyepiece has a 1.25” nosepiece and is threaded for filters. It
weighs 255 grams, measures 94mm tall (including the nosepiece) and has
a 56mm maximum diameter.