The Skywatcher Esprit 120ED PRO is an apochromatic triplet refractor that offers high performance for demanding astrophotographers. The objective lens features an element of extra-low dispersion glass (ED) that minimizes the chromatic aberration for the best colour correction.

The 3" linear power focuser is solid and backlash-free, with zero image shift. It operates at two speeds due to the 11:1 reduction mechanism for extra fine focusing adjustment, which is paramount for astrophotography and high resolution observations. The knobs have been redesigned to allow smooth and accurate usage, even with gloves. The integrated rotator makes framing targets quick and easy.

The objective lens is fully multi coated with Skywatcher's proprietary new "Metallic High-Transmission Coating" (MHC) for an effective anti-reflection result that approaches a transmission of 99.5%. The aluminium tube has knife-edge baffles and is blackened to ensure high contrast and absorbing stray light.

The Esprit 120ED includes a two element field flattener, correcting the frame for field curvature and providing a 40mm imaging circle, making it suitable for large sensors.

The Esprit 120ED Pro includes a high quality 2" dielectric diagonal, right angled 9 x 50 finderscope, 1.0x field flattener, Canon EOS M48 T-ring, plus adapters for connecting common accessories and a heavy-duty hardcase.

Specifications

Optical design	Apochromatic ED triplet
Objective diameter	120 mm
Focal length	840 mm
Focal ratio	f/7
Resolving power	1.00 arc second
Stellar limiting magnitude	12.4
Max. magnification	240 x
Light gathering power	294 times the human eye
Mount attachment	Losmandy-style dovetail
Focuser	3" linear power dual speed (11:1)
Tube weight	10 kg
Tube length	762 mm
Tube diameter	156 mm
Dew shield diameter	175 mm
Visual back focus	180 mm
Flattener back focus	75 mm from M62 x 1 thread, 55 mm with 20 mm adapter ring
Threads on tube rings	1/4"-20, 80 mm between outermost threads, 51 mm between middle threads approx.
Distance between tube rings	269.5 mm centre to centre approx.

Items included

Esprit 120ED with dual speed focuser
2" dielectric star diagonal (90°)
Field flattener with M48 x 0.75 thread
9 x 50 right angled finder scope
Canon EOS T-ring
Vixen-style dovetail bar
2" to 1.25" eyepiece adapter
Foam-lined aluminium carrying case

Downloads

Instruction manual

Gallery

Centaurus A by Dave Sokolich | Esprit 120ED Pro, ZWO ASI2600MM Pro, Antlia LRGB filters.

Sombrero Galaxy by Dave Sokolich | Esprit 120ED Pro, ZWO ASI2600MM Pro, Antlia LRGB filters.