Gran Turismo 81 vs FSQ-80FC: Refractor Showdown
By Cloud Break Optics | Published: 2026-10-20
Category: Comparisons
Compare the William Optics Gran Turismo 81 and Takahashi FSQ-80FC for astrophotography. We break down the trade-offs to help you choose the right refractor.
Quick answer
For a versatile, budget-friendly imaging setup, choose the Gran Turismo 81 package; for portability and legendary Takahashi optics on full-frame sensors, the FSQ-80FC is the premium choice.
Optical design and full-frame coverage
The Takahashi FSQ-80FC is built around a legendary astrograph design, delivering a flat field across modern full-frame sensors at a fast f/5.6. The Gran Turismo 81 is a well-regarded apochromatic refractor, but its stock configuration is optimized for smaller sensors; achieving full-frame coverage typically requires additional accessories like a dedicated flattener.
If you plan to use a full-frame camera, the FSQ-80FC's native flat field is a significant advantage. For APS-C or smaller sensors, both scopes perform admirably, and the GT81's lower price makes it a compelling value.
Portability and travel imaging
The FSQ-80FC is specifically designed for portability, with a compact 80mm aperture and lightweight construction that suits travel imaging. The Gran Turismo 81, while not heavy, is part of a package that includes a flattener and guide scope, adding bulk and weight to your travel kit.
If you frequently travel to dark-sky sites, the FSQ-80FC's compact form factor is a clear winner. If your imaging is primarily from a fixed backyard observatory, the GT81's slightly larger footprint is unlikely to be a problem.
Value and included accessories
The Gran Turismo 81 Astro Imaging Package includes the GT81IV, the Adjustable Flat6AIII flattener, and a 32mm slide-base Uniguide guide scope. At a catalog price of $1050.56 (compared to $1568.00), it offers a complete imaging solution at a very attractive price point.
The FSQ-80FC, priced at $2628.00 (compared to $4380.00), is a significant investment. You'll need to purchase a flattener and guide scope separately if you don't already own them, which increases the total cost of ownership.
Key trade-offs to consider
- Full-frame imaging: The FSQ-80FC is designed for full-frame sensors out of the box. The GT81 typically requires a flattener for full-frame coverage; the included Flat6AIII may not be optimized for full-frame. If you shoot full-frame, prioritize the FSQ-80FC.
- Portability: The FSQ-80FC is compact and lightweight, ideal for travel. The GT81 package is bulkier due to the included flattener and guide scope. If you travel to dark sites, the FSQ-80FC is easier to pack.
- Value and accessories: The GT81 package includes essential accessories at a lower price. The FSQ-80FC costs more and requires separate purchases for a flattener and guide scope. If you're on a budget, the GT81 package offers more for less.
Product facts at a glance
- Gran Turismo 81 IV Astro Imaging Package: The Gran Turismo 81 Astro Imaging Package includes the GT81IV, the Adjustable Flat6AIII, and the 32mm slide-base Uniguide guide scope. This package provides a complete imaging setup—telescope, flattener, and guide scope—so you can start imaging without buying extra components.
Gran Turismo 81 IV Astro Imaging Package - FSQ-80FC Refractor Telescope: The Takahashi FSQ-80FC offers a 450mm focal length and fast f/5.6 optics, delivering sharp stars and a flat field across modern full-frame sensors. This means you can use a full-frame camera without needing a separate field flattener, simplifying your imaging train and ensuring edge-to-edge sharpness.
Which refractor fits you?
Best for
- Astrophotographers who want a complete imaging package with a guide scope and flattener at a value price.
- Imagers using APS-C or smaller sensors who don't need full-frame coverage.
Not for
- Full-frame camera users who want native flat-field performance without extra accessories.
- Travel imagers who prioritize minimal weight and compact size over included accessories.
