Product details
Normally, a long focal length of 500 mm is housed in a lens of 500 mm length. To achieve a handy, universally applicable, and compact solution, this lens employs a clever trick. The light path is simply "folded" using two high-precision ground mirrors. This results not only in a compact design and over 50% greater aperture compared to a lens of the same focal length but also a very short minimum focusing distance of just 2 meters. Focusing is done manually. The lens can be used with either automatic exposure or manual exposure settings, depending on the camera.
In the folded light path, it is technically impossible to incorporate an iris diaphragm. If light reduction is necessary, this is easily achieved with neutral density filters that can be screwed onto the rear lens. There is a thread M34x0.5 available for this purpose.
Practically: The lens does not have a fixed defined infinity stop. Focusing is done in a "swinging" manner, allowing the sharp point to be accurately found from out of focus to sharp and back to out of focus.
T2 connection, operating tip: The T2 adapter is screwed onto the lens, then the lens is locked in place. The side screws on the T2 adapter allow for "uprighting" the lens after loosening - aligning the index upwards. Retightening the screws securely holds the lens and adapter together.
Advantages of a full-frame lens on a camera with an APS-C sensor: Save time in post-processing. Many lens errors such as distortion, edge softness, or vignetting occur in the outer areas of the image. By using a lens designed for full-frame on a camera with an APS-C sensor, these areas are not utilized. This way, you achieve maximum quality.