The PL to B4 adapter is used with the PL mount on the camera. It has a magnification of 2.8x, which results in 2.5+ stops reduced exposure. It offers a flexible solution, which also can be used on other PL mount cameras with S35 sensor size.
The B4 mount is in exchange with the PL or EF mount. It has a magnification of 2.5x, which results in 2.5+ stops reduced exposure. It offers the best possible optical quality, is more stable and a little shorter in length. Changing a mount on AMIRA can...