The ACTAR-19 is the Actus' Ultra Wide Angle Lens for Mirrorless and DSLR cameras.This lens is permanently attached to an Actus lens panel and has a focal length of 19mm. Thanks to its relatively light weight and modest size it is easy to carry to location shootings, making it an ideal companion for interior, landscape and architectural photographers.
The ACTAR-19 has very little geometrical distortion. The 71mm image circle enables horizontal shift of 15mm to each side when using a full frame (24x36) sensor in landscape and 18mm in portrait mode. Combined with the larger (33x44) sensor in Fujifilm GFX 50/100 and Hasselblad X2D cameras the Actar-19 still offers at least 9mm of shift.The image circle generously covers the 54x41 mm sensor of modern digital backs and can be used with the On-Sensor shutter in Phase One and Hasselblad backs.
The optical design is a 17 element in 13 groups, including elements with Nano Crystal Coat. The aperture ranges from f/4 to f/32 in half stop increments. Please note that the aperture is manual and there are no electronical connections available nor needed.