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Looking for a pocket-sized telescope? The 80mm f/6 Air-Spaced Triplet ED Apochromatic Refractor may be the answer. Ok, it’s not quite that small, but at 7.5 pounds, this tiny telescope is portability perfection and the winner of our TopTenREVIEWS Silver Award. Size is just one small way this instrument stands out among astrophotography beginner telescopes. This scope is so versatile. It’s great for viewing comets, deep sky objects, double stars and even terrestrial targets. Above all, this apochromatic refractor offers excellent quality optics at a reasonable price. It’s an ideal second telescope or first telescope for astrophotography.
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• 80mm f/6 air-spaced triplet apochromatic
optics using a Hoya FPL51-equivalent ED element •
dual-speed 2” rack and pinion focuser with 10:1 ratio fine focusing • dovetail foot for installing on a Vixen-style altazimuth or
German equatorial mount • dovetail shoe for installing optional finderscope• extended product lifetime
The Explore Scientific ES80 "Essential Series" refractor
uses a premium Hoya ED glass element and state-of-the-art optical multicoatings
in its apochromatic air-spaced ED triplet optics. The result is images that are
essentially free of the annoying halo of unfocused violet light (chromatic
aberration) that mars the view of bright stars and solar system objects in
lesser scopes, despite the fast focal ratio of the ES80, and even at very high
The Explore Scientific ES80 is a natural as a lightweight
grab-and-go scope for spur-of-the-moment backyard astronomy. It also makes a
top-notch travel scope to take across town or around the world. In addition,
it’s a nifty fast focal ratio astrograph to piggyback on a larger scope for
serious wide field imaging, or you can even use it on a big altazimuth or
equatorial mount as the heart of your observing system. Considering its
surprisingly low price for an apochromatic triplet, and in view of the great
optical performance that comes as standard equipment, the 80mm Explore
Scientific ES80 is a terrific buy!
Features of this
telescope . . .
apochromatic triplet refractor optics: 80mm (3.1”) aperture, 480mm
focal length, f/6 focal ratio three-lens air-spaced
optical system. The optics use a center lens element of Hoya FCD1 (Dense Fluor
Crown) glass, the Hoya equivalent of FPL-51 ED (Extra-low Dispersion) glass.
This ED element produces superior sharpness and color correction by minimizing
the chromatic aberration, the “false” color fringing seen around bright objects
when light rays pass through standard crown-and-flint doublet objectives. The
result is to reduce spurious color halos and fringing to vanishingly low levels.
multicoated optics: The ES80 triplet objective lens has EMD™ (Enhanced
Multilayer Deposition) antireflection multicoatings on all air-to-glass surfaces
for high light transmission, minimal light scatter, and excellent contrast.
baffles: The aluminum tube has contrast-enhancing internal light
baffles and a specially darkened tube interior to provide dark sky backgrounds
and high terrestrial contrast.
optics: One of the bonuses of owning a refractor is that, compared to
standard reflector telescopes, they almost never require realigning of the
optics (collimation). However, any air-spaced refractor telescope may require
optical recentering if the lens elements are knocked out of alignment by a heavy
blow during shipping or use. Removing the dew shield will give you access to the
lens centering screws in the sides of the lens cell, which you can then adjust
yourself by referring to the supplied instructions. You can also send your scope
to Explore Scientific’s Service Center for precision alignment. A standard
service charge applies for factory realignment.
The supplied removable dew shield slows the formation of dew on the
lens in cold weather to extend your undisturbed observing time. It also improves
the contrast, similar to the effect of the lens shade on a camera lens, when
observing during the day or when there is excessive ambient light at night, such
as a neighbor’s backyard security light. A single thumbscrew holds the dew
shield in place, allowing the felt-lined dew shield to be removed from the
scope, reversed, slid back onto the optical tube, and stored for transport in
only a few seconds. The optical tube measures a compact 18.5” long, including
the dew shield. A thread-in metal dust cap for the optical tube is standard.
Dual speed 2”
rack and pinion focuser: The precision-made no-backlash focuser has
dual-speed focusing. There are two coarse focusing knobs. The right knob also
has a smaller concentric knob with a 10:1 reduction gear microfine focusing
ratio. This provides exceptionally precise image control during high
magnification visual observing and critical 35mm or CCD imaging. The large focus
knobs have ribbed gripping surfaces so they are easy to operate, even while
wearing gloves or mittens in cold weather. The focuser drawtube has a scale
marked in centimeters and 1mm increments. This lets you note individual focuser
positions for easy return to the correct focus when switching between visual use
and photography. Two knobs underneath the focuser lets you adjust the tension on
the drawtube to accommodate varying eyepiece/photo accessory loads, as well as
firmly lock in a photographic focus. The focuser has a non-marring 2" brass
compression ring equipment holder.
For serious astronomy and astrophotography, the ES80 has an L-shaped
dovetail mounting foot that is shaped to fit directly into the Vixen-style
dovetail slot on the head of many of the most popular light to medium capacity
altazimuth and German VX Series go-to equatorials, the Meade LXD-75 or LX-80
go-to equatorials, and the Vixen Sphinx and Great Polaris Deluxe equatorial
mounts and Porta altazimuth mount, among others. In addition, the dovetail has
both 1/4"-20 and 3/8” holes that allow you to mount the 7.5 pound scope
(including diagonal) directly onto any good photo tripod for casual astronomy or
daytime terrestrial observing. A knob on the body of the scope allows you to
rotate the tube assemblyand focuser to line up a camera in either a landscape or
portrait orientation (or any orientation in between), then temporarily lock the
focuser in that position.
product lifetime warranty: This individually serial numbered Explore
Scientific telescope is backed by a limited one year warranty, which will be
extended to an Explore Scientific transferable product
lifetime limited warranty when its warranty card is registered with Explore
Scientific within 60 days of purchase. Full details on this unique transferable product lifetime warranty. What's in the Box Explore Scientific 80mm f/6 Essential Series Triplet RefractorVixen Style Dovetail2" Dual-Speed Focuser2" Dielectric DiagonalFinderscope base (FINDER SOLD SEPARATELY)