Astrhori 10mm f/8 APS-C

The Astrhori 10mm f/8 APS-C is a M-mount lens for Leica rangefinder cameras. Leica price index ↗

Reference maintained by Thomas Boots

Focal Length: 10mm

Aperture: 𝑓/8

Release Year (from): 2022

Diameter: 52 mm

Length: 19 mm

Minimum Focus Distance: 0.3m

Elements in Groups: 5/4

Mount: M

Material Weight: Metal, 36g

Colors: Silver

astrhori.cn

AstrHori 10mm f/8 APS-C

Built as a body-cap style pancake, the AstrHori 10mm f/8 is one of the smallest and least expensive lenses offered in Leica M mount, intended to live permanently on the camera as a slim, always-ready ultra-wide. On an APS-C sensor its 10mm focal length gives an angle of view roughly equivalent to a 15mm lens in full-frame terms, and the design uses pan-focus operation so that the entire scene falls within an acceptable depth of field without focusing adjustments [1]. AstrHori and retailers position the lens for street snaps and landscapes, where its fixed settings allow quick, grab-and-shoot use [1].

The optical formula consists of five elements in four groups, including three extra-low dispersion elements intended to control distortion and chromatic aberration [1][2]. The aperture is fixed at f/8 with no diaphragm to adjust, and focus is set by the pan-focus design rather than a focusing helicoid, so the lens has no rangefinder coupling. The barrel is an all-metal, multicoated construction, and at only a few tens of grams it is among the lightest M-mount lenses available [1][2]. Minimum focusing distance is around 0.3 m [1]. Because it is designed for the smaller APS-C image circle, it does not cover the full 35mm frame on a digital M body.

The lens is sold by AstrHori in several mounts and sensor formats, and the variants are not all identical: some listings describe a fisheye projection with a very wide angle of view, while the manufacturer's own M-mount material presents the lens as a rectilinear-style ultra-wide pan-focus optic [1][2]. The Leica M version was handled in Japan by E&I Creations from September 2024 at a suggested price of 19,800 yen, and AstrHori explicitly markets it as optimized for monochrome photography, noting that color images may show casts [1]. A silver finish is offered for the M-mount version.

Optical qualities

Rendering Documented performance is modest, in keeping with the lens's low cost and simple construction. Reviewers report good central sharpness and pleasing color rendition, alongside softer corners and visible vignetting [3]. AstrHori states the lens is tuned for high-contrast monochrome output and recommends shooting in black and white, since color frames can exhibit color shifts [1]. One review of the lens on an APS-C body similarly noted a color shift in color images [3].

Sharpness Center sharpness is rated as good, while corner sharpness is described as average [3].

Contrast and color The lens is designed to deliver clear, high-contrast results that suit monochrome work; in color use it can introduce color casts, which is why the maker suggests black-and-white shooting [1].

Distortion and vignetting Vignetting is a noted weakness in testing [3]. Claims about the projection geometry vary between sources and mount versions, so the degree of distortion depends on the specific variant [1][2].

History

Development and Launch AstrHori is a contemporary Chinese maker of inexpensive manual-focus lenses, and the 10mm f/8 entered its catalogue as a budget ultra-wide pancake offered across multiple mirrorless mounts. The Leica M mount version reached the Japanese market through distributor E&I Creations in September 2024, with marketing emphasizing its compact body-cap format and suitability for monochrome photography [1].

Special editions No major factory special editions of the M-mount lens are widely documented beyond the standard finish.

Collector Notes Buyers should be aware that the 10mm f/8 exists in several forms across mounts and sensor sizes, and that published specifications differ between sellers; figures for filter thread, diameter and weight in particular are inconsistent across listings, and some sources describe a fisheye version with markedly different dimensions [1][2]. Because the lens is a recent, low-cost item rather than a vintage collectible, originality and serial-number concerns are minimal, but it is worth confirming the exact variant, mount and intended sensor coverage before purchase.