About this product
Part Number: 20096
Optically matched for the Sky-Watcher Esprit-150 ED Triplet refractor telescope.
Provides a fully illuminated and corrected 36mm 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 M48 thread.
Removing the adaptor reveals an M71x1 internal thread with maximum 75mm back focus for self-made adaptor solutions.
Features & Specification
- Three-element design
- Fully Multi-Coated optics
- 36mm Imaging Circle
- 2-Inch filter compatible
- 75mm back focus or 55mm with supplied adaptor
- M48x0.75 adapter
- Green anodised aluminium screw-on end caps
- Net weight 910g (with end caps)
|Average Rating (2 Reviews): |Works fine on newer Esprit 150 but may not fit the older version of Esprit 150
Thursday, 17 February 2022 | Goran
Maybe there should be a warning here that this reducer does not fit the older version of Esprit 150 (I have tried and it does not fit into the draw tube) but it fits well in my newer Esprit 150. Maybe SW has changed the design or made some adapter since I bought mine, but anyone with an old Esprit 150 should check this with FLO. See this SGL thread: https://stargazerslounge.com/topic/366049-new-sky-watcher-077x-reducers-for-esprit-120-150/page/2/
Sky-Watcher 0.77x Reducer for Esprit 150ED Triplet
Tuesday, 2 March 2021 | Stephen
I purchased this to bring the FOV using a KAF 8300 CCD camera more in line with my existing APS-C CMOS camera. No supplied documentation in the box but all the info you need is in the FLO description. Spacing is critical to achieve good star shapes in the corners, but one bonus is that focus is achieved with only 16 mm of focus travel, vs 65 mm when using the SW F/F. The stars in my OAG camera are now elongated but PHD guides on them OK and that may just require some adjustment of the prism.
A cheaper alternative to buying another IMX 571 sensor camera, recommended.
Please fill in the form below to ask a question.
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.