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Black cylindrical lens barrel with manual focus ring and Pentax K mount

Venus Optics

Venus Laowa 100mm f/2.8 2x Ultra Macro APO Lens for Pentax K

SKU CH-SR78-ZH56E

A 100mm f/2.8 manual-aperture macro lens achieving 2:1 magnification at a 9.72in minimum focus distance with APO correction for full-frame Pentax K cameras

  • 2:1 macro magnification reveals minute details at 9.72" minimum focus
  • APO design minimises chromatic aberration for full-frame clarity
  • Manual focus ring enables precise depth-of-field control
  • 100mm f/2.8 focal length suits diverse close-up subjects
  • Bundle adds 67mm filter kit, cleaning kit and cap tether

100mm f/2.8 2x Ultra Macro APO Lens

The Venus Laowa 100mm f/2.8 2x Ultra Macro APO Lens is a manual-aperture prime designed for Pentax K-mount cameras. It covers full-frame sensors and delivers 2:1 magnification, allowing photographers to capture subjects at twice life-size. The apochromatic optical design minimises chromatic aberration across the frame. This lens suits macro specialists who need greater-than-life-size reproduction without accessories.

Manual focus with 9.72" minimum distance

Focusing is entirely manual, giving the photographer direct tactile control over the focus plane. The closest focusing distance is 9.72 inches, which is the working distance required to reach the maximum 2:1 magnification. At this distance depth of field becomes extremely shallow, demanding precise adjustments and often a tripod or focus rail. The manual aperture ring allows exposure control without electronic coupling to the camera body.

2:1 magnification exceeds standard macro

Most macro lenses stop at 1:1 life-size reproduction; this optic reaches 2:1, revealing detail that a standard macro cannot resolve. That extra magnification is the single specification that determines whether the lens matches the intended subject scale. Photographers who only need 1:1 will find simpler, often lighter alternatives, while those who require the 2:1 capability gain it natively without extension tubes or close-up filters.

Highlights

  • 2:1 macro magnification reveals minute details at 9.72" minimum focus
  • APO design minimises chromatic aberration for full-frame clarity
  • Manual focus ring enables precise depth-of-field control
  • 100mm f/2.8 focal length suits diverse close-up subjects
  • Bundle adds 67mm filter kit, cleaning kit and cap tether

Specifications

No published specifications for this item yet.

Questions about this item

Should I choose the 67 mm filter kit or a different thread size?

The included ProOptic kit uses 67 mm threads, matching the lens front diameter so filters mount directly without step-up rings.

What does the 2x magnification actually deliver at the 9.72 inch minimum focus distance?

At 9.72 inches you reach 2:1 reproduction, rendering subjects twice life-size on a full-frame sensor with APO correction keeping colour fringing negligible.

How does the manual aperture ring on the Pentax K mount affect exposure control?

The aperture ring lets you set f/2.8 by hand, so exposure is controlled mechanically rather than electronically.

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