COSINA

ULTRON 21mm F1.8 Aspherical

Innovation of high speed

Features

Features large F1.8 maximum aperture This is a versatile high performance lens capable of capturing available light images even in low light situations and utilizing the expressive power of bokeh even though its a wide angle lens. Its new optical design draws sharp images right from maximum aperture.

Main Features

Large maximum aperture usable in many applications

With an impressive F1.8 maximum aperture for a super wide-angle lens, this lens enables imaging using fast shutter speeds in dimly lit locations or at night without having to use a flash. Furthermore, the lens enables creative expression utilizing its extremely shallow depth of focus for a super wide-angle lens.

Excellent imaging quality from maximum aperture

Its new optical design featuring an element with an aspherical surface draws sharp images from maximum aperture. The lens uses an optical configuration with 13 elements in 11 groups to achieve its large maximum aperture and thoroughly eliminate aberrations.

Minimum focus distance of 0.5 meters

When attached to a mirrorless interchangeable-lens camera using our mount adapter, the lens focuses beyond the minimum rangefinder-coupled focus distance of 0.7m all the way down to 0.5m. You can enjoy the high performance of this lens on various platforms beyond the scope of rangefinder-coupled cameras.

Manual focus for reliable focusing

Employs a very precisely machined and adjusted all metal helicoid unit lubricated with high quality grease to realize smooth focusing operation with just the right amount of torque. This enables very precise focusing.

Bayonet type VM mount

Uses the VM-mount lens mount compatible with Leica M-mount. Not only can this lens be used on rangefinder-coupled cameras, but design-wise it also balances very nicely when mounted on mirrorless digital cameras with a mount adapter.

Installed with a focus-coupling system

The high-precision rangefinder coupling mechanism enables precise focusing in focus critical situations such as when shooting at or close to maximum aperture.

Imaging circle that covers full frame format

The lens features a generous imaging circle that covers the 35 mm full frame format. Furthermore, its size is extremely compact compared to interchangeable lenses for single-lens reflex cameras.

Specifications

Lens diagram

Focal Length
21mm
Aperture Ratio
1 : 1.8
Minimum Aperture
F22
Lens Construction
11 groups 13 elements
Angle of View
91°
Aperture Blade
10
Minimum Focus
0.5m
Rangefinder Coupling
∞~0.7m (It depends on the camera)
Diameter × Length
φ69.0×78.4mm
Filter size
φ58mm
Weight
412g
Hood
Integrated Petal Hood

EAN

Ean Code
EAN 4002451196109

Examples

  • ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
  • ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
  • ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
  • ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
  • ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
  • ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
  • ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
  • ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
  • ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
  • ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
  • ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
Voigtländer ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
Voigtländer ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
Voigtländer ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
Voigtländer ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
Voigtländer ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
Voigtländer ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
Voigtländer ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
Voigtländer ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
Voigtländer ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
Voigtländer ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
Voigtländer ULTRON 21mm F1.8 Aspherical PHOTO BY Tetsu Iida
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ULTRON 21mm F1.8 Aspherical - 株式会社コシナ