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William Optics Gran Turismo 81 (f/6.6) / GTF81
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Telescope or lens
William Optics Gran Turismo 81 (f/6.6) / GTF81
williamoptics.com/.../GTF81-User_Guide-1.pdf
| Type | Refractor: Petzval |
|---|---|
| Diameter | 81 mm |
| Focal length | 535 mm |
| Weight | 3.70 kg |
| Users | 17 |
| Images | 120 |
| Most often used with |