TTArtisan AF 40mm f/2

The TTArtisan AF 40mm f/2 is a small autofocus prime for full frame mirrorless cameras, sold for Sony E, Nikon Z and Leica L mount. The 40 mm focal length sits between 35 mm and 50 mm and is often chosen for street, travel and documentary work. TTArtisan positions it as a compact and light all-rounder in a metal body.

Optical design

TTArtisan specifies 9 elements in 6 groups, including ED and aspherical elements. A review lists 2 high-refractive, 1 aspherical and 1 ED element. The aperture runs from f/2 to f/16 with 7 diaphragm blades, the angle of view is 57 degrees and the minimum focus distance is 0.4 m. The reviewer Dustin Abbott observed noticeable vignetting at f/2 and minor focus breathing, which should be read as one tester's finding.

Autofocus and handling

An STM stepping motor drives the autofocus, and the lens supports face detection. The aperture ring has detents and an A position for camera control. According to the same review there are no switches or custom buttons on the barrel and no visible weather sealing gasket. A Type-C port for firmware updates is built into the rear lens cap.

Build and size

The body is machined from 5052 aluminum. TTArtisan gives a weight range of about 166 g to 176 g depending on the mount. B&H lists 176 g for the Sony E version with 61 mm diameter and 44 mm length and 176 g for the Nikon Z version with 65 mm by 46 mm, while Dustin Abbott measured 167 g for Sony E. The filter thread is 52 mm and a metal hood is included. We have no dimensions for the L mount version.

Where it fits

There is no predecessor in our database. In the same focal length class the Sony FE 40mm F2.5 G weighs 173 g, the Viltrox AF 40mm F2.5 weighs 180 g on Sony E and Nikon Z, and the Nikkor Z 40mm F2 weighs 170 g. The TTArtisan matches them in weight while offering f/2 where the Sony and Viltrox lenses stop at f/2.5.

Pros and cons

Pros

• About 170 g and very compact
• f/2 aperture
• Metal build with metal hood
• Type-C firmware updates
• Available for three full frame mounts

Cons

• Vignetting at wide apertures according to a review
• No AF/MF switch or custom button
• Only 7 diaphragm blades
• Weight and size figures differ between sources

Verdict

The TTArtisan AF 40mm f/2 is a lightweight, simple lens for photographers who value size and a classic aperture ring layout. Reviewers point to vignetting as a trade-off, and the spec sources are not perfectly consistent, but it joins the small and light 40 mm group at a clear f/2.