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Cambo ACTAR-20 20mm f/4 Lens without Lens Plate

The Cambo ACTAR-20 is a 20mm f/4 lens designed for Lens Board (Technical Camera) mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

Cambo ACTAR-20 20mm f/4 Lens without Lens Plate

Cambo ACTAR-20 20mm f/4 Lens without Lens Plate

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Lens Overview — Cambo ACTAR-20

The Cambo ACTAR-20 is a 20mm prime lens built for large-format technical camera systems, mounting via a Lens Board (Technical Camera) interface. Designed to cover the large-format frame, this ultra wide-angle prime offers a maximum aperture of f/4 and is operated entirely through manual focus — consistent with the deliberate, precision-driven workflows typical of technical camera shooting. With a 20mm focal length, it sits firmly in the wide-angle category, making it well-suited for architectural, landscape, and fine art photography where expansive coverage and precise control over framing are priorities.

The lens accepts 82mm front filters, giving photographers access to a broad range of polarizers, ND filters, and other optical accessories. Weighing in at 1200g, the ACTAR-20 is a substantial optic reflecting its large-format construction and optical demands. Image stabilization is not included, which is standard for a lens designed for use on a tripod-mounted technical camera system.

The absence of autofocus is intentional: this is a lens built for photographers who work methodically, composing carefully and focusing manually with precision tools. It is listed as compatible with DSLR-category camera systems using a technical camera lens board mount.

Key Features — Cambo ACTAR-20

20mm Large-Format Prime: Fixed 20mm focal length designed specifically for large-format technical camera systems, providing an expansive ultra wide-angle field of view.

Large Image Circle: Covers the large-format frame, giving photographers the full image circle needed for movements such as shift and tilt on technical cameras.

f/4 Maximum Aperture: Wide maximum aperture of f/4 supports adequate light transmission across the large-format image circle at this focal length.

Lens Board Mount: Mounts via a technical camera lens board interface, making it compatible with Cambo and similar large-format technical camera systems.

Manual Focus Design: Fully manual focus operation suits the deliberate, tripod-based workflows typical of architectural, landscape, and fine art technical camera photography.

82mm Filter Thread: Front filter thread accepts standard 82mm filters, including polarizers and ND filters commonly used in controlled shooting environments.

Lens Specifications — Cambo ACTAR-20

Cambo ACTAR-20 full specifications
SpecDetail
Use CasesStudio
Lens TypePrime
FormatLarge Format
Zoom/PrimePrime
Focal Length20mm
Maximum Aperturef/4
Camera SystemDSLR
Lens MountLens Board (Technical Camera)
AutofocusNo
Focus TypeManual
Image StabilizationNone
Filter Thread82mm

Description — Cambo ACTAR-20

The Cambo ACTAR-20 is a 20mm ultra wide-angle prime lens designed for large-format technical camera systems. It mounts via a Lens Board (Technical Camera) interface and is classified under the large-format lens category, making it purpose-built for technical camera workflows that demand wide coverage and image precision. The lens operates at a maximum aperture of f/4 and relies entirely on manual focus, supporting the measured, tripod-based approach that large-format photography demands.

With an 82mm filter thread, photographers can easily attach polarizers, graduated ND filters, or other accessories to manage exposure and light. Weighing 1200g, the ACTAR-20 is a solid, well-constructed optic appropriate for its format. No image stabilization is provided, which is expected for a lens of this type intended for use on a stable support. This listing does not include a lens plate, so buyers should confirm compatibility with their specific Cambo technical camera setup before purchase.

Pros — Cambo ACTAR-20

  • ✓20mm focal length provides a notably wide field of view for large-format coverage
  • ✓Large-format lens format ensures expansive image circle for technical camera use
  • ✓82mm filter thread accommodates a wide range of standard photographic filters

Cons — Cambo ACTAR-20

  • ✗No image stabilization (imageStabilization: None), requiring stable support for sharp results
  • ✗Manual focus only (autoFocus: false), which may slow shooting for some workflows
  • ✗Maximum aperture of f/4 offers limited light-gathering capability compared to faster primes

Frequently Asked Questions — Cambo ACTAR-20

What mount does the Cambo ACTAR-20 use?+
The ACTAR-20 uses a Lens Board (Technical Camera) mount. This means it is designed for use with technical camera systems that accept lens board-mounted optics, not standard DSLR or mirrorless bayonet mounts.
Does this lens support autofocus?+
No. The ACTAR-20 is a manual focus lens (autoFocus: false, focusType: Manual). All focusing must be performed manually, which is standard practice for large-format technical camera photography.
What filter size does the ACTAR-20 accept?+
The lens has an 82mm filter thread, so it accepts any standard 82mm screw-in filters including polarizers, ND filters, and UV filters.
How heavy is the Cambo ACTAR-20?+
The lens weighs 1200g. Given this weight and its large-format design, it is best used on a sturdy tripod or camera support system.
Is image stabilization included?+
No, the ACTAR-20 does not include image stabilization (imageStabilization: None). For sharp results, a solid tripod and careful technique are recommended.
Is this lens sold with a lens plate included?+
No. As indicated in the product title, this version of the ACTAR-20 is sold without a lens plate. Buyers will need to source a compatible lens plate separately for their technical camera system.

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