Caldwell Photographic and Metabones have announced the Speed Booster Q666, also known as “The Devil’s Speed Booster”, exclusively for Pentax Q series cameras. The unusual nickname apparently stems from the fact that the new adapter boasts a record-breaking f/0.666 aperture and a 0.5x magnification. Like all Metabones Speed Boosters, the Speed Booster Q666 is optimised to fully account for the camera’s filter stack located near the sensor surface.  This is especially critical at the maximum aperture of f/0.666.  As a result, a huge 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 what Metabones claim to be "the most advanced Nikon G aperture adjustment mechanism in the industry." The Speed Booster Q666 is available from the Metabones website and its worldwide dealer network for $489.

Via Pentax Rumors

Metabones Press Release

Metabones Devil's Speed Booster Q666 0.50x Press Release

Petersburg, VA, USA:  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 an 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.

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.

The Speed Booster Q666 will be available starting in Aug 2017 from the Metabones website (http://www.metabones.com/products/details/MB_SPNFG-Q-BM1) and its worldwide dealer network for US $489.00, plus shipping and applicable taxes and duties.

Metabones Nikon G to Pentax Q Speed Booster Q666 0.50x Specifications:

Model Code:  MB_SPNFG-Q-BM1

Color:  Black Satin exterior; Black Matte interior

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>#/p###

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

Weight: 193 grams for Nikon F/G version

Tripod Mount:  Robust removable type with Arca Swiss compatibility 

Notes:

MTF data is a full diffraction-based calculation that assumes the Speed Booster Q666 is attached to a perfect master lens having an exit pupil distance of 100mm.  Note that the MTF calculations do not take into account sensor-induced apodization effects, sometimes called “pixel vignetting” or “pixel shading”, so actual results at large apertures are likely to be better than the calculations indicate.

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