Laowa Aksen 17.5mm f/1.7 5-10X Ultra Macro APO

The Laowa Aksen 17.5mm f/1.7 is a parfocal ultra-macro lens: focus stays locked on the subject as you run the zoom ring through its 5x to 10x magnification range, so you frame once and then scale the shot without refocusing. An internal zoom mechanism keeps the barrel length and the 22.48mm working distance fixed, which means the lighting and the camera position stay where you set them. The APO optical design is what holds colour fringing down at the top of that range.

G&G stocks it in Canon EF, Canon RF, Sony FE, Nikon Z, Nikon F, L Mount, Fuji X and MFT. A coaxial illumination version is also available in every one of those mounts; it lights the subject down the optical axis, which is how you get a shadowless frame at this magnification. The iris runs 11 blades over an aperture range of f/1.7 to f/5.6, focusing is manual, and the front diameter is dia. 42mm.