Many have reported that their lenses fit tight. My 45 was very tight on several bodies. I suggest getting used to it, and do not sand any metal. You may be successful and not cause any damage, but then again you may not and possibly regret it.Already read some reports. I have a hard time inserting lens on my new EM10, including a used 45mm and a new oly 25mm. I would sand the pieces of metal a bit, but the sensor is right there, so this is a terrible idea. Should I just get used to it?