Originally posted by Kenneth3aracing In k-x, can i set the lens adjustment? I saw there is a lens correction/input focal length, but it is disable when I put the FA 50mm macro on.
Whatever i can set the lens adjustment, it means the lens which I purchased has problem, it is better to ask them return / repair.
The K-x does not have a focus correction in the menu. The "input focal length" entry is for entering the focal length of a manual lens where the camera cannot automatically read it (for use with the SR system). In the case of the FA50 macro, the K-x knows it's a 50mm lens so the option to enter it manually is disabled. Lens correction is also something different. That is used to correct distortion and CA and is not an option with the FA50/2.8 macro because that feature only works with DA lenses (and on some bodies the FA limited lenses).
The only way to adjust the AF on a K-x body is through the debug menu, and that alters how the body behaves with all lenses, not just the FA50/2.8. In this case, it sounds like an issue with this particular lens. As others have suggested, my advice is to return the lens if it's not working properly. KEH is very good about returns and it should have no problems dealing with them.