The Viltrox 56mm f/1.4 is a fast, auto-focusing prime lens designed for APS-C sensor cameras. It features a bright f/1.4 maximum aperture, a 56mm focal length (equivalent to 85mm on a full-frame camera), and is available for various mounts including Fujifilm X, Sony E, Canon EF-M, and Nikon Z. The lens incorporates an STM stepping motor for quiet and fast autofocus, an integrated USB port for firmware updates, and a 9-blade diaphragm for pleasing bokeh. 

Optical Characteristics:

Focal Length: 56mm (85mm equivalent on APS-C)

Maximum Aperture: f/1.4

Minimum Aperture: f/16

Angle of View: 28°

Lens Construction: 10 elements in 9 groups, including 1 ED (Extra-low Dispersion) element and 1 high refractive index element

Minimum Focus Distance: 2 feet / 60 cm

Maximum Magnification: 0.1x

Diaphragm Blades: 9 

Physical Characteristics:

Filter Size: 52mm

Weight: Approximately 290g (10.2 oz)

Dimensions: Approximately 65mm x 72mm (diameter x length)

Focusing: STM stepping motor, internal focusing, full-time manual focus override

Mounts: Fujifilm X, Sony E, Canon EF-M, Nikon Z

Other Features: Integrated USB port for firmware updates, manual aperture ring 

Key Features and Considerations:

Aperture:

The f/1.4 aperture allows for shallow depth of field and excellent low-light performance. 

Autofocus:

The STM motor provides fast and quiet autofocus, making it suitable for both still and video shooting. 

Image Quality:

The lens is designed to minimize aberrations and distortions, delivering sharp images with good color accuracy. 

Portability:

The compact and lightweight design makes it a great option for travel and everyday photography. 

Firmware Updates:

The USB port allows for easy updates to keep the lens performing at its best.