Venus Laowa 105mm F2 Smooth Trans Focus

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Venus Laowa 105mm F2 Smooth Trans Focus

Canon EF, Nikon F (FX), Pentax KAF2, Sony/Minolta Alpha, Sony FE
Designed to provide a wealth of control over out-of-focus quality and to enhance bokeh, the Laowa 105mm f/2 Smooth Trans Focus Lens from Venus Optics is a short telephoto prime designed for FX-format Nikon F-mount cameras. The unique optical design incorporates an apodization (APD) element, as well as two separate diaphragms—8- and 14-blade—to provide separate adjustment over the bokeh as well as the exposure and depth of field. This APD element functions as a radially graduated neutral density filter, and as such limits the light transmission to a T-stop value of 3.2, while permitting the depth of field and selective focus qualities of a true f/2 design.

Venus Laowa 105mm F2 Smooth Trans Focus Lens

Alongside the unique attributes of the APD element, the lens also incorporates three low dispersion elements and one extra refractive index element to control chromatic aberrations and color fringing, as well as produce a great deal of overall clarity and sharpness. The lens is also characterized by its manual focus, manual aperture design, that provides a wealth of control over focus and exposure to benefit working with the APD element.

  • Short telephoto prime designed for FX-format Nikon F-mount cameras, this lens can also be used on DX models where it provides a 157.5mm equivalent focal length.

  • Optical design incorporates an apodization element that helps to improve the quality of bokeh. This element, which resembles a radially graduated ND filter that tapers from clear in the center to more dense around the edges, produces more circular out-of-focus highlights for more pleasing selective focus and shallow depth of field effects.

  • To control the effect of the apodization element, two separate diaphragms are incorporated in the lens' design: a 14-blade diaphragm that works mainly in conjunction with the APD element to control bokeh, as well as a standard 8-blade diaphragm at the rear of the lens design to control the overall light transmission and affect depth of field.

  • Due to the incorporation of the APD element, the lens offers an effective light transmission value of T3.2, while the f/2 designation relates mainly toward the potential for selective focus and depth of field control.

  • Beyond the APD element, the lens also features three low dispersion elements and one extra refractive index element, which combine to limit chromatic aberrations throughout the aperture range and contribute to a high degree of sharpness and clarity.

  • A manual focus design permits fine-tuned control for focusing as closely as 3' away with a maximum magnification of 0.16x.

  • Two manual aperture rings enable you to adjust both the exposure-affecting diaphragm as well as the APD-affecting aperture.


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Specifications
Primary specifications
Lens type Prime lens
Max Format size 35mm FF
Focal length 105 mm
Image stabilization No
Lens mount Canon EF, Nikon F (FX), Pentax KAF2, Sony/Minolta Alpha, Sony FE
Aperture
Maximum aperture F2
Minimum aperture F22
Aperture ring Yes
Number of diaphragm blades 9
Aperture notes Has dual aperture rings. F-stop ring has 9 blades, T-stop ring has 14 blades.
Optics
Elements 11
Groups 8
Special elements / coatings 1 APD, 3 HR, 3 LD elements
Focus
Minimum focus 0.90 m (35.43)
Autofocus No
Full time manual Yes
Focus method Internal
Distance scale Yes
DoF scale Yes
Physical
Weight 745 g (1.64 lb)
Diameter 76 mm (2.99)
Length 99 mm (3.9)
Sealing No
Filter thread 67 mm
Other


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Venus Laowa 10mm Trans Focus Reviewed by Gene Wright on Rating: 5