William Optics FLAT GT flattener (1x magnification) for the Gran Turismo series (P-FLAT-GT) extras opinie

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The William Optics FLAT GT 1.0x field flattener is a dedicated accessory designed for use with Gran Turismo series refractors. The 1.0x optical design preserves the telescope’s focal length while correcting field curvature, ensuring sharp stars across the entire frame – including full-frame sensors.
 
The compact design with M63 and M48 threads allows easy integration with a wide range of cameras and imaging systems, while the precisely defined backfocus enables optimal matching with specific Gran Turismo telescope models.

Key features

• 1.0x flattener – no change to telescope focal length
• designed for William Optics Gran Turismo series refractors
• field curvature correction for sharp stars across the entire sensor
• compatible with APS-C and full-frame sensors
• telescope-side thread: M63 × 1
• camera-side thread: M48 × 0.75 (T2)
• compatible with Canon EF / RF, Nikon F / Z, Sony E, Pentax K, MFT, Fuji X cameras
• compact and lightweight design

Included in the box

• William Optics FLAT GT 1.0x flattener

Technical specifications

• magnification: 1.0x
• optical design: 1 group / 2 elements
• optical length: 20.4 mm
• telescope-side thread: M63 × 1 (length 6 mm)
• camera-side thread: M48 × 0.75 (length 4 mm)
• compatible sensor formats: APS-C, full frame
• supported camera systems: Canon EF / RF, Nikon F / Z, Sony E, Pentax K, MFT (Micro 4/3), Fuji X
• weight: 179.7 g
• compatibility – Gran Turismo 71:
  • backfocus: 56.6 mm
  • adjustment: 1.6 mm threaded spacer (remove the front extender)
  • image circle: ∅44 mm
• compatibility – Gran Turismo 81 IV:
  • backfocus: 55 mm
  • adjustment: 30.85 mm front extender (remove the threaded spacer)
  • image circle: ∅44 mm
• compatibility – Gran Turismo 81 WIFD + front extender:
  • backfocus: 55 mm
  • adjustment: additional extender required (remove the threaded spacer and front extender)
  • image circle: ∅44 mm

The FLAT GT 1.0x is a precise field flattener designed for astrophotography, enabling sharp stars across the entire sensor without altering the telescope’s focal length.