Flattener + focal reducer for Sky-Watcher 80ED

Reducer adapted to Sky-Watcher 80ED and Celestron 80ED refractors. Used to reduce the focal length to 0.85x, improves field correction.

By using an M48x0.75 ring with a Canon or Nikon mount, you can connect your camera to the reducer.

• multiplicity: 0.85x
• telescope side thread: female M56
• camera side thread: male M48
• total diameter: 64 mm
• weight: 271.7 g
• intended use: Celestron 80ED, Sky-Watcher 80/600 APO ED

Important expert note

It should be remembered that this device is characterized by a constant backfocus value, i.e. the distance from the lens to the primary focus, e.g. the matrix of a digital camera. Generally speaking, both the reduction factor for focal reducers and its increase in the case of Barlow lenses change with the distance from the main focus, so you can easily choose the required value.

However, if we are dealing with flatteners or field correctors, the backfocus value must be precisely defined and cannot be changed. This means that a sharp image can only be obtained when the user sets the correct focal length, which sometimes requires precision of 0.1 mm.

Most of these types of variable focal length accessories have a manufacturer-specified focal length. However, if you can’t find this information in the user manual or on the website, a general assumption is that the typical back-focus value for astrophotography is 55 mm. If your camera is not designed for this value or you are using modified equipment, look at the products listed below that will solve your problem:
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