In special cases, such as when you need to set the correct distance between the camera sensor and a photo corrector (field flattener, coma corrector, or focal reducer), you have to be very precise. If the extension of the right distance is not available, you can use this T2 variable extension ring that can be adjusted at will in a progressive way from 29 to 46mm. Furthermore, this accessory can also be used when we want to adjust the camera framing at a precise angle. The T2 variable extension ring allows you to adjust the camera angle to shoot in the desired frame.