▪ 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%
▪ 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 (include non-AI & AI lens mounts)
▪ 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. Industry's best aperture ring covers a 8-stop range markings, clearly indicating actual number of f-stops. No more guesswork! (Patent pending).
▪ The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo Clam ball heads.
Tips: Before mounting your lens to the adaptor, please make sure that the f-stop of aperture ring on the adaptor is turned to "7" (i.e. mounting your lens to the adaptor while only the aperture ring in the adaptor is full closed.).
Remark: This mount is manual aperture control. It does NOT support electronic aperture control.
Disclaimer: we are NOT licensed, approved or endorsed by Pentax or Nikon
List of incompatible lenses
Nikkor 2.1cm f/4
Nikkor AI-S 20mm f/2.8
Nikkor E series lens (the diaphragm blades are not operated by mechanical linkage levers, such as Nikkor 105mm f/1.4E, PC-E 24mm, 45mm, 85mm T/S, and Nikkor AF-S 16-80mm f/2.8-4E ED DX VR)
“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.