Skywatcher Focal Reducer Evolux 62ED 0.90x for 62mm ED Apo Refractors

Skywatcher Focal Reducer Evolux 62ED 0.90x for 62mm ED Apo Refractors is an optical accessory that shortens the effective focal length of compatible 62mm ED apochromatic refractor telescopes by approximately 10%. Designed for wide-field astrophotography and visual observing, the reducer preserves image quality while increasing the field of view and reducing required exposure times. It fits between the telescope and camera or the visual back and maintains the optical performance expected from ED glass objectives.

Advantages

The 0.90x focal reduction enlarges the usable sky area on the sensor without introducing significant aberrations when used with matching 62mm ED apochromatic refractors. By shortening the focal length, it decreases exposure times for deep-sky targets and eases framing for landscape and wide-field imaging. The unit is compact and engineered to provide consistent back focal distance for straightforward installation with common camera adapters and visual backs.

Suitable for

• Wide-field astrophotography with 62mm ED apochromatic refractors
• Reducing exposure time for deep-sky imaging
• Landscape and night-sky combined imaging
• Visual observing when a wider field of view is required
• Framing adjustments for planetary or small-object composition

Key specifications

• Reduction factor: 0.90× (approximately 10% shorter focal length)
• Compatible objective diameter: 62 mm ED apochromatic refractors
• Optical purpose: focal length reduction for imaging and visual use
• Field of view: increased relative to native telescope focal length
• Mounting position: between telescope and camera or visual back
• Effect on exposure: reduces required exposure times for given target scale

How to use

Install the focal reducer in the optical train between the rear cell of the 62mm ED refractor and the camera adapter or visual eyepiece holder, ensuring secure mechanical connection and correct spacing to maintain focus. After mounting, achieve focus using the telescope’s focuser and confirm that the imaging sensor or eyepiece plane is within the reducer’s designed back focal distance. For astrophotography, re-collimate if necessary and perform test exposures to adjust framing and focus. For visual use, verify that the reducer does not cause vignetting with the chosen eyepiece or diagonal.

Usage recommendations

Use the focal reducer with telescopes specifically designed as 62mm ED apochromats to ensure optimal image quality. When imaging, take calibration frames (flats, darks, bias) after installation to correct for any slight illumination falloff. Check mechanical clearances to avoid sensor vignetting and re-check focus after any adapter or camera change.