Specs

• Magnification: 0.50x
• Crop Factor for Pentax Q, Q10: 2.8x
• Crop Factor for Pentax Q7, Q-S1: 2.3x
• Maximum Output Aperture: f/0.666 (with f/1.2 lens attached)
• Rectilinear Distortion: < 0.666%
• Lens Elements/Groups: 6/4
• 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
• Lens Compatibility: Any full-frame (36 mm x 24 mm format) or DX format (APS-C) lens with the appropriate mount can be used.
• Special Features: Long-throw clickless aperture ring on Nikon F/G version
• Dimensions: 27 x 76 x 72mm for Nikon F/G version
• 193 grams for Nikon F/G version
• Arca Swiss compatibility
• $489.

PR

Caldwell Photographic Inc. and Metabones is pleased to announce the Speed Booster Q666, a.k.a. “The Devil’s Speed Booster”, exclusively for Pentax Q series cameras. With its 0.5x magnification and world-record f/0.666 maximum speed, it is crazy wicked fast. So make a deal with the devil today and turn your Pentax Q with its back-illuminated sensor into a monster low-light machine unlike anything ever seen in photography. Attach a f/1.2 lens and stop down a little to see how Stanley Kubrick made do with f/0.7 for filming those famous candle-lit scenes in “Barry Lyndon”. Or open up all the way to f/0.666 and probe the darkness in a way that no photographer has ever been able to do until now.

With an advanced 6-element optical design, the Q666 packs lots of optical horsepower in a small package. Sharpness is excellent even at f/0.666 and is downright superb if you stop down to f/1.0. Distortion is very low, with a maximum value of, naturally, 0.666%. And thanks to the back-illuminated sensor used in Pentax Q cameras, the full f/0.666 maximum aperture can be utilized with minimal pixel vignetting effects commonly seen in other cameras used with high-speed lenses.

At f/0.666 (i.e., with a f/1.2 master lens) the MTF is high near the axis and only falls off gradually toward the corners. As the aperture is reduced to f/1.0 and then f/2.0 the MTF becomes very high and more even across the field. There is less than 1 stop of corner illumination falloff even at f/0.666. And guess what - there is no vignetting at all after the output aperture reaches f/1.82. Rectilinear distortion added by the Speed Booster Q666 is negligible at less than 0.666%.

Like all Metabones Speed Boosters, the Speed Booster Q666 is optimized to fully account for the camera’s filter stack located near the sensor surface. This is especially critical at the record-setting f/0.666 aperture now possible with the Q666. As a result, an enormous range of optics, from vintage film lenses to the latest digital designs, will function flawlessly when adapted to any Pentax Q camera. Planned lens mounts for the Speed Booster Q666 include a Pentax-K version and a Nikon F/G version with the most advanced Nikon G aperture adjustment mechanism in the industry.