0.8x Variable Focal Reducer for Tecnosky 70 to 102 mm Refractors

0.8x Variable Focal Reducer for Tecnosky 70 to 102 mm Refractors

DESCRIPTION

This 0.8x full frame focal reducer is a versatile optical accessory designed for Tecnosky apochromatic refractors (or similar models) from 70 mm to 102 mm aperture. It both corrects the field (avoiding vignetting) and shortens the focal length of the telescope, making it ideal for astrophotography with full-frame sensors. The reducer features a default backfocus of 55 mm, precisely adjustable up to 70 mm. On the camera side, an M48x0.75 thread allows the use of standard 2" (50.8 mm) filters.

TECHNICAL SPECIFICATIONS

• Compatibility: Tecnosky 70 SLD, 80 SLD/EDT, 102 ED

• Focal reduction: 0.8x

• Image format: full frame

• Field correction: built-in

• Resulting focal lengths:

  • 70/420 → 336 mm at F/4.8

  • 80/480 → 384 mm at F/4.8

  • 102/714 → 571 mm at F/5.6

• Backfocus: 55 mm, adjustable up to 70 mm

• Camera thread: M48x0.75 (supports 2" filters)