GranTurismo 81 IV in classic William Optics red
The William Optics GranTurismo 81 IV Red It provides sharp, calm images without color errors. The apochromatic FPL-53 triplet ensures pure colors, so that shots look clean and professional, and the visual viewing experience is also clear and high-contrast, especially with the Moon, planets, and fine star fields.


Premium triplet, complete lever set
The 81mm triplet on a 478mm focal length (f/5.9) provides image scale with travel weight. A handle, Vixen dovetail, Bahtinov mask, and the 2-to-1.25-inch adapter are included as standard, along with the soft carrying case. Set up, focus, and shoot.
In the box
- Optical tube GranTurismo 81/478 IV triplet, red version
- Vixen-Style dovetail
- Handle
- Bahtinov mask
- 2 inch to 1.25 inch adapter
- 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: Astrophotographers who want the GT81 triplet in the recognizable William Optics red. Not for: Those who choose by price; the standard version has the same optics and scope of delivery for 100 euros less.
Specifications
| Optical design | Apochromat, FPL-53 triplet |
| Opening | 81 millimeters |
| Focal length | 478 mm |
| Opening ratio | f/5,9 |
| Focus assist | Bahtinov mask |
| Attachment | Vixen-style dovetail with handle |
| Execution | OTA (loose tube), Red |
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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