PERAR 17mm F4.5 Full MC – retro focus super wide ultra-thin design only 10.2mm long
This is a slow lens, but it tosses the standard practice for retro focus lens designs in the trash, as it is as small as a body cap, weighs only 70 grams, and is just 10.2mm long, making it easy to use outdoors.
Performance is very high from maximum aperture. Due to the four element four group optical design and full multi-coating, the characteristics of this lens are excellent color rendition and high contrast. When the distance scale is set to 1.4m, everything from 0.8m to infinity is in focus. To take good snaps, hold the camera upright against your chest without looking through the viewfinder, approach the subject, and press the shutter while looking at the subject directly, and you can capture dynamic expressions.
Specifications
ULTRA MINI retro focus 17mm f4.5 (ultra-wide 100 degree coverage)
4 elements in 4 groups, all multi-coated
Leica mount with focus coupling from 0.85m to infinity
Focuses down to 0.3m on mirrorless cameras
Size: 50mm diameter x 10.2mm length
Weight: 60g for lens, 100g for set
(Images taken on a Sony A-7r with a Metabones adapter, so not peak performance for the M mount)