Normally, a long focal length of 500 mm is housed in a 500 mm long casing. To achieve a handy, versatile, and compact solution, this lens employs a trick. The light path is "folded" using two high-precision ground ring mirrors. This design results in a compact construction and an aperture that is more than 50% larger than that of a lens with the same focal length, as well as a very short minimum focus distance of just 2 meters. Focusing is manual, and the lens can be used in aperture priority or manual exposure mode depending on the camera. Technically, it is not possible to insert a diaphragm blade into the folded light path. If light reduction is necessary, this can be achieved with neutral density filters (not included) that screw in before the rear lens. There is an M34x0.5 thread for this purpose.

The lens does not have a fixed infinity stop. Focus is adjusted by oscillation, with the focus point being securely found from out of focus to sharp and back to out of focus. The T2 adapter is screwed onto the lens and then locked in place. After loosening the screws on the side of the T2 adapter, the lens can be "straightened" so that the index can be aligned upwards. Retightening the screws securely fastens the lens and the adapter.

Using a full-frame lens on a camera with an APS-C sensor saves time in post-processing. Many lens errors, such as distortions, edge softness, or vignetting, occur in the outer areas of the image. By using a lens designed for full-frame on an APS-C sensor camera, these areas are not utilized, resulting in maximum quality. Therefore, additional post-processing time to correct lens errors is not required.