Redefining Aperture and Depth of Field for Canon DSLR Users

In this review, we will examine the Speedmaster F0.95 lens, specifically designed for Canon DSLR mount users. This iteration of the lens aims to provide users with a remarkable F0.95 aperture while compensating for a relatively poor T-stop of T1.3. Although there are multiple 50mm F0.95 lens options available in the market, this particular lens stands out due to its innovative approach in addressing the constraints of the longer Canon mount.

To achieve this impressive F-stop, the lens requires a larger projection circle and additional glass elements. The design features a unique rear mount with a cut-out, allowing for the inclusion of full-width rear glass, pushing the lens capabilities to its limits. Despite its specialized design for Canon mounts, this lens offers compatibility with a wide range of contemporary camera systems.

The shallow DOF specialist

Unprecedented in Canon mounts: the largest rear glass element, delivering ultra-thin DOF on a 50mm DSLR lens, despite T-stop limitations.

The bold rear design with expansive glass elements, pushing photographic boundaries


  • Focal length: 50mm
  • Maximum aperture: F0.95
  • Minimum aperture: F16
  • Lens mount: Canon EF
  • Lens format coverage: Full Frame
  • Focus type: manual focus
  • Filter size: 82mm
  • Angle of view: 45°
  • Minimum focus distance: 65cm (25.6 inches)
  • Maximum magnification: 0.1x
  • Optical design: 12 elements in 6 groups
  • Diaphragm blades: 11
  • Dimensions: 89 x 122mm (3.5 x 4.8 inches)
  • Weight: 1500g (3.31 lbs)

A Video Sample Displaying Depth of Field Range


Showcasing Focus Variance

Exploring the Creative Potential: Overcoming Optical Challenges

The optical performance of the lens encounters some challenges due to the limitations of the Canon mount. With several large glass elements, imperfections such as chromatic aberrations and ghosting may arise. However, this lens offers a wealth of creative possibilities when compared to the ultra-sharp modern lenses.

The showcased photographs were captured using a Sony Fx3, which has a lower resolution sensor but delivers impressive color performance. A pro mist filter, the Freewell ND6-9 Mystic Edition, was utilized to reduce sharp ghosting in the highlights.

Dreamlike visuals for a mesmerizing photographic experience.

ND Filter to Enhance Lens Performance: Sample Image Comparisons

In the following analysis, we illustrate how appropriate usage can enhance the performance of this lens. By comparing sample images, the effectiveness of the ND filter in mitigating the lens's optical issues becomes evident.

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