I am not sure if this have been ask before. As we know M43 is of Crop factor of 2.0 as compare to 35mm , thus a greater depth of field. My understanding is if I were to fix a native lens of olympus 17mm f2.8 lens on my Micro 43 camera, this is similar to a focal length of 34mm F5.6 on 35mm camera But What if i were to fix a non native lens for example nikkor 50mm f1.8 on my Micro 43 camera. This will be similar to 100mm but what will be the apenture like? will it be 0.95 or will it be 3.5? The reason why I am asking is the other day i was trying to take my own photo for passport needed. but the eye in focus but my ears. are far from focus. Guys, your input?