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Metabones Nikon G to Pentax Q Speed Booster Q666 0.50x MB_SPNFG-Q-BM1
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| Type of Product | Adapters for lens |
| Adapter is for lenses | Nikon |
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Optical Performance and Design
The Metabones Nikon G to Pentax Q Speed Booster Q666 0.50x is designed exclusively for Pentax Q series cameras, featuring a 0.5x magnification and an unprecedented maximum aperture of f/0.666. This adapter transforms your Pentax Q camera with its back-illuminated sensor into a powerful low-light photography tool. When paired with an f/1.2 lens, stopping down slightly allows you to achieve exceptional brightness similar to the f/0.7 aperture used in classic cinematography. Opening fully to f/0.666 enables unprecedented light gathering capabilities.
Its advanced 6-element, 4-group optical design delivers excellent sharpness even at the maximum aperture, with superb image quality when stopped down to f/1.0. The adapter maintains very low rectilinear distortion, capped at 0.666%, ensuring high fidelity in image reproduction. The back-illuminated sensor of Pentax Q cameras minimizes pixel vignetting effects typically seen with high-speed lenses.
Key Features
- Color: Black Satin exterior; Black Matte interior
- Magnification: 0.50x
- Crop Factor: 2.8x for Pentax Q and Q10; 2.3x for Pentax Q7 and Q-S1
- Maximum Output Aperture: f/0.666 (with f/1.2 lens attached)
- Rectilinear Distortion: less than 0.666%
- Lens Elements/Groups: 6 elements in 4 groups
- Length Reduction: 10.1 mm
- Supported Cameras: Pentax Q, Q10, Q7, Q-S1
- Camera Mount: Pentax Q-mount
- Image Format: 7.44 mm x 5.58 mm (1/1.7")
- Lens Mounts: Nikon F/G (including non-AI and AI lens mounts)
- Lens Compatibility: Compatible with any full-frame (36 mm x 24 mm) or DX format (APS-C) lens with the appropriate mount
- Special Features: Long-throw clickless aperture ring on Nikon F/G version with an 8-stop range clearly marked for precise manual aperture control (patent granted)
- Detachable tripod foot compatible with Arca Swiss, Markins, and Photo Clam ball heads
Usage Tips and Compatibility
Before mounting your lens to the adapter, ensure the aperture ring on the adapter is set to "7" (fully closed aperture) to avoid damage. This adapter supports manual aperture control only and does not provide electronic aperture control.
Incompatible Lenses
- Nikkor 21 mm f/4
- Nikkor AI-S 20 mm f/2.8
- Nikkor E series lenses without mechanical diaphragm linkage, including but not limited to Nikkor 105 mm f/1.4E, PC-E 24 mm, 45 mm, 85 mm T/S, AF-S 70-200 mm f/2.8E FL ED VR, AF-S 16-80 mm f/2.8-4E ED DX VR, and AF-S 24-70 mm f/2.8E ED VR
Build Quality and Materials
Metabones adapters are precision-engineered using brass with chromium plating on both the camera and lens sides, ensuring smooth mounting, durability, and a premium finish. The lens side features a strong leaf-spring structure to secure the lens connection, reducing wear and preventing focus errors or optical misalignment. The interior is treated with matte black to minimize internal reflections and maintain optical quality.
Additional Features
- Precision-machined brass construction with satin surface finish matching OEM lens and camera mounts
- Precise fit with no play or wiggle when mounted, requiring no adjustments
- Designed to maintain infinity focus and correct registration distance for lenses with floating elements or close-range focusing
