Metabones creates a whole host of lens adaptors and Speed Boosters that reduce focal lengths and boost effective apertures of lenses. Now they’ve created a new Devil’s Speed Booster Q666 0.50x for Pentax Q cameras that will turn them into “low light monsters.”
The new speed booster allows you to mount any Nikon F or G mount lenses onto your Pentax Q camera (excluding the Nikon 2.1cm f/4 and 20mm f/2.8 AI-S lenses). Not only that but, if you attach a f/1.2 lens, you’ll end up with a “world-record” f/0.666 equivalent lens to play with (hence the “Devil” in the name). Combined with the back-illuminated sensor of the Pentax Q, that is one good low-light performing setup right there.
The booster is designed with 6 elements in 4 groups and “provides excellent sharpness, even at f/0.666” and only experiences fall-off near the corners.
It will give a magnification of 0.5x and produce a crop factor of 2.8x for Q and Q10 cameras, or a crop of 2.3x for Q7 and Q-S1 cameras. Distortion is extremely low (a maximum of 0.666%) and vignetting is also minimal. It’ll reduce the focal length of your lens by 10.1mm.
The mount provides manual aperture control but is not able to support electronic control. There’s a “long-throw clickless aperture ring” with an 8-stop range that will indicate the number of f-stops.
The Metabones Speed Booster Q666 is available for $490 on the Metabones website.
from PetaPixel https://petapixel.com/2017/10/11/metabones-new-speed-booster-turns-pentax-qs-low-light-monsters/
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