Sky-Watcher 0.77x Reducer for Esprit 120ED Triplet

Sky-Watcher 0.77x Reducer for Esprit 120ED Triplet

  (1 Review)
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About this product

Model:  skywatcher_reducer_esp120
Part Number:  20095

Optically matched for the Sky-Watcher Esprit-120 ED Triplet refractor telescope.

Provides a fully illuminated and corrected 34mm image circle suitable for sensor formats up to APS-C. 

This three-element focal reducer/flattener has a reduction factor of 0.77x for imaging at f5.4.

55mm back focus for use with M48 Canon EOS or Nikon adaptor rings. 

Includes a standard adaptor with an M48 thread (you will need an Astro Essentials M48 Camera Adapter to suit your DSLR camera). 

Removing the included adaptor reveals an M78x1 male external thread with a maximum 95mm back-focus for self-made adaptor solutions. 


Features & Specification

  • Three-element design
  • Fully Multi-Coated optics
  • 34mm Imaging Circle
  • 2-Inch filter compatible
  • Maximum 95mm back focus or 55mm with the supplied adaptor
  • M48x0.75 adapter
  • Green anodised aluminium screw-on end caps
  • Net weight 910g (with end caps)


Customer reviews

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Sky-Watcher 0.77x Reducer for Esprit 120ED Triplet
01 June 2021  | 

The 0.77 Reducer is absolutely excellent, working brilliantly with the Esprit 120 (focal length 840mm at f7) and giving me a whole lot of new options, presenting me with a telescope of focal length 650mm at f5.3.
It produces exquisite details and perfect stars
I now have an additional telescope thatís fits in between my Esprit 120 and W.O. Zenithstar 81 (440mm with its reducer).
I did require some help from FLO in fitting the reducer. I did not realise that it has to inserted deep into the focusing tube of the telescope to engage with the screw thread!


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Q1. Is this necessary if I use the EvoGuide 50ED only as a guidescope?

No. Guiding software is only interested in the centre of the star and is usually very tolerant of star shape so a flattener is not necessary.

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