Sky-Watcher 0.77x for Evostar 150EDX Reducer Corrector

Designed specifically for imaging with the Sky-Watcher Evostar 150EDX, this reducer corrector combines two important optical functions within a single accessory: focal-length reduction and improved field-edge correction.

Its 0.77x reduction factor brings the effective focal length of the telescope down to 77% of its original value. This changes the optical configuration of the Evostar 150EDX for imaging applications.

Alongside focal reduction, the corrector improves correction towards the outer areas of the image field. This is particularly relevant for astronomical imaging, where optical performance across the field is important in addition to the central area.

The reducer corrector is optimised specifically for the Evostar 150EDX. It is therefore presented as a dedicated accessory for this particular refractor rather than as a universal reducer for a range of different telescopes.

For connection to Canon or Nikon cameras, Sky-Watcher specifies the use of its corresponding M48 T-ring adaptors. Product code 20237 is used for Canon cameras and product code 20238 for Nikon cameras.

This provides a coherent imaging configuration for the Evostar 150EDX combining focal reduction, field correction and an M48 photographic connection suitable for the camera system being used.

0.77x Focal Reduction

The optical reduction factor is:

• 0.77x

The resulting effective focal length therefore corresponds to:

• 77% of the native focal length of the Evostar 150EDX

Focal reduction is the first main function of this accessory and directly changes the imaging configuration of the refractor.

Field Correction

The second main function concerns correction towards the edge of the image field.

The corrector provides:

• Significantly improved field-edge correction

This correction complements the focal reduction and allows the photographic field of the Evostar 150EDX to be used more effectively.

Optimised for the Evostar 150EDX

This accessory is optimised for:

• Sky-Watcher Evostar 150EDX

Its specific compatibility allows the corrector to be paired with the refractor for which its optical system is designed.

Designed for Imaging

The primary application of this reducer corrector is:

• Astronomical imaging

Its design combines the two functions required for this application:

• Focal-length reduction
• Improved field-edge correction

M48 Camera Connection

For camera connection, the reducer corrector is used in conjunction with a suitable Sky-Watcher M48 T-ring.

Two corresponding adaptors are available:

• Canon M48, product code 20237
• Nikon M48, product code 20238

The required T-ring therefore depends on the camera system being used.

Canon Camera Configuration

For Canon cameras, connection is made using:

• Sky-Watcher Canon M48 T-ring
• Product code 20237

Nikon Camera Configuration

For Nikon cameras, connection is made using:

• Sky-Watcher Nikon M48 T-ring
• Product code 20238

Technical Specifications

• Manufacturer : Sky-Watcher
• Model : 0.77x reducer corrector
• Manufacturer product code : 20333
• Type : Reducer corrector
• Application : Imaging
• Optimised telescope : Sky-Watcher Evostar 150EDX
• Reduction factor : 0.77x
• Resulting focal length : 77% of native focal length
• Field-edge correction : Improved
• Associated camera connection : M48
• Compatible Canon T-ring : Sky-Watcher M48 product code 20237
• Compatible Nikon T-ring : Sky-Watcher M48 product code 20238