Now you can buy the popular Esprit 80 ED Triplet APO with matching field flattener at a discounted price! A very popular imaging refractor with superior glass, a stunning focuser, complete with accessories and a flight case.
Sky-Watcher Professional ESPRIT 3-Element ED apochromatic refractors offer optical performance rivaling similar telescopes from even the most famous high-end brands.
Designed primarily for demanding astro-imagers wanting high-contrast images full of detail and zero detectable colour fringing, even on the brightest of objects!
An M48-fitting doublet field flattener is also available to flatten the field and minimize aberration and distortion. When used with the field flattener the Esprit-80's imaging circle is 33mm.
The M48 fitting provides a large clear aperture to reduce halation and a precision thread ensures the triplet and doublet lens groups are precisely aligned on the optical axis perpendicular to the image.
Price includes storage case
An in house Zygo interferometer test & report is available with this telescope. Click here to read about the interferometer test in more detail. There are various packages available on this model. Please select from the packages above. The optical test and enhance includes a full inspection of the telescope, including optics, focuser, paintwork and other mechanical parts. A precise optical check is then performed then the scope is enhanced to ensure you get the best possible optical performance from your new instrument.
The interferometer is essentially a measuring instrument. Within the interferometer is a calibrated laser that is pointed through the optical test surface, then onto a high quality reference sphere, then back through the test subject then to an internal camera which gives us the measurement on the screen. From this, we can adjust the position of the test optic and the reference sphere to obtain a perfectly calibrated system. The more central the laser to the test optic and then on return, the better and more accurate reading and measurement we can take. This takes a lot of adjustment to get the best results from the optical surface. Once the measurement has been taken, we are provided with a series of results that show the optical quality of the surface plus other information. We will aim to provide 0.95 Strehl or higher. 
Main Features
Premium optical materials
Short focal length and full frame corrected focal plane
Excellent field flatness across a 33mm imaging circle when used with the optically-matched field flattener
Precision linear power focuser
Metallic high-transmission lens coatings
Light-baffled optical systems
Telescope tube attachment hardware
Knife-edge Baffled Optical System
2.7” Dual Speed Linear Power Focuser
2.7” LPF with 2” and 1.25” eyepiece adaptors and indexed scale
Zero focus-shift during focusing
High Load Capacity
New drawtube with steel sheet held by four large bearings makes focusing smoother than ever
The smooth focus motion and 11:1 fine focus wheel allows precision adjustment and critical focusing of eyepieces & cameras
Patent-pending design
Specifications
Optical Design : Apochromatic Triplet with ED element
Diameter : 80mm
Focal Length : 400mm
F-ratio : f/5
Linear Power Focuser Diameter : 2.7"
Tube Weight : 3.97 kg
Tube Dimensions : 8.3 x 45 cm
Field Flattener Details:
An optically-matched M48-fitting doublet field flattener for Skywatcher's Esprit 80 ED PRO triplet refractor.
The M48 fitting provides a large clear aperture to reduce halation and a precision thread ensures the triplet and doublet lens groups are precisely aligned on the optical axis perpendicular to the image.
When used with the field flattener the Esprit-80's imaging circle is 33mm.
Notes
When fitting a DSLR camera you need only a M48 Ring to suit your Canon or Nikon camera. No spacers are required.
The spacing for dedicated CCD imaging cameras is 54.9mm from mating surface (75mm from centre of rear element).
The rear thread is M48. When using T-threaded accessories you will need an M48-T adapter.
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