OTA Sky-Watcher 72ED Black Diamond Double Speed ​​DS Refractor Telescope (72/420)

Description

All about the Sky-Watcher EvoStar 72ED telescope

Sky-Watcher recently completed its range of apochromatic refractors with the EvoStar 72ED. It is the brand's smallest diameter ED refractor, aimed at amateurs looking for an instrument that is as portable and lightweight as possible. The EvoStar 72ED weighs just 2kg (with collars and dovetail) for a length of 420mm, its spray shield is even removable if needed (but not retractable). The high optical quality of this model offers everyone the possibility to purchase a powerful instrument at a very attractive price for wide-field astrophotography, planetary / solar observation or autoguidance. The EvoStar 72ED will delight any user.

To obtain the valuable "APO" qualifier, a refractor must correct for primary and secondary chromatic aberrations inherent in all systems whose light rays pass through an optical element. In the case of the Sky-Watcher EvoStar 72ED, a doublet composed of an ED glass element reduces chromatism to significantly limit the appearance of colored edges on the planets or the Moon. The ED glass chosen, FPL-53 (Schott), is the most capable of correcting these defects thanks to a very low dispersion (NB: this doublet is different from the Black Diamond models).

The use of multilayer treatments on all surfaces significantly limits losses due to lens passing, making the EvoStar 72ED brighter and more contrasting than conventional refractors that are less corrected. The "Metallic High-Transmission" (MHC) treatment is applied to the air glass surfaces, which guarantees impressive results (transmission close to 99.5%). Thanks to its very short focal length ratio, f / 5.8, the Sky-Watcher EvoStar 72ED is particularly interesting for deep sky photography .. In combination, for example, with a large format digital camera (corrector / reducer recommended ), point the telescope towards large nebulae such as Orion, the Lagoon or the famous Andromeda galaxy

10: 1 double speed focuser

Focusing is achieved through a 2 "(aluminum) Crayford focuser with a fine focus knob with 10: 1 reduction ratio, which provides the necessary force and precision when focusing. An adjusting screw maintains the focus depending on the optical orientation of the tube to be aligned with the objects and provide good results in astrophotography (where focus is essential).

To meet the requirements of amateur astronomers, the optical tube is made entirely of aluminum. Plastic parts are not used! The solidity is and the aesthetics go hand in hand in this model. The interior is blackened and manufactured to limit stray light intrusion. A Kodak through screw is placed over one of the clamps to parallel adapt a camera.

Specifications TUBE

Optical Design Apochromatic Refractor ED

Optical diameter 72 mm

Focal length 420 mm

F / F / 5.8 ratio

Maximum magnification 144x

Magnitude 11.3

Focuser diameter 2 "dual speed, crayford

Tube weight 2.00 kg

Tube dimensions 8,2 cm x 42 cm

Shipping weight 7 kg

Shipping Dimensions 60 x 26 x 22 cm3 

Items delivered

1 Sky-Watcher EvoStar 72ED optical tube

2 rings

1 Vixen-type dovetail

1 Kodak camera overlay bracket on top of one of the mounting rings

Hard case with pre-cut foam