The ACTAR-24 is a lens with almost no geometrical distortion. As the image circle is 60mm, there is an optically allowed horizontal shift possible of 10mm each side when using a full frame (24x36) sensor in landscape mode, and 12mm in portrait mode. When using a smaller APS-C sensor the shift possibilities grow to 15mm and 17mm. Of course vertical shifts have the same possible numbers in reverse order.
The optical design of this lens is a 16 element in 11 groups, of which all lenses are multicoated to achieve the best contrast. The aperture range is from f/3,5 to f/22 in half stop increments. Please note that the aperture is manual and there are no electronical connections available nor needed.