GT81 WIFD: triplet with internal focuser and built-in rotator
The William Optics GranTurismo 81 WIFD is the most advanced GT81: the apochromatic triplet combined with the internal WIFD focuser and a built-in field rotator. Sharp stars, high color purity, and complete control over your composition, without disconnecting the imaging train.
Remaining balance
The internal WIFD focuser does not shift any weight outside the tube: the balance on the mount remains constant, even with a heavy camera. The built-in rotator adjusts the composition precisely without affecting the focus. With a 478 mm brand focal length at f/5.9, you can photograph nebulae and star fields quickly and consistently; the Bahtinov mask ensures precise focusing.
In the box
- Optical tube GranTurismo 81/478 with WIFD focuser
- Built-in field rotator
- Vixen-Style dovetail
- Handle
- Bahtinov mask
- Soft carrier bag
Featured accessories
The William Optics Flat GT flattener (329 euro) flattens the field to full-frame; the UniGuide 32 mm guidescope (159 euro) enables long exposures.
For whom yes, for whom no
For: demanding astrophotographers who want the GT81 triplet with internal focuser and rotator as a complete imaging tube. Not: those buying mainly on a budget; the standard GT81 IV delivers the same triplet optics with an external focuser for 400 euros less.
Specifications
| Optical design | Apochromat, FPL-53 triplet |
| Opening | 81 millimeters |
| Focal length | 478 mm |
| Opening ratio | f/5,9 |
| Focuser | WIFD (intern) |
| Rotator | Built-in |
| Focus assist | Bahtinov mask |
| Attachment | Vixen-style dovetail with handle |
| Execution | OTA (loose tube) |
Unsure about the right tube for your camera and mount? The telescope selection aid helps you choose. Also view all Refracting telescopes and the full range of William Optics.
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