focus distance

[HDNitehawk]

I think you need to clarify.
The Auto Focus of the camera doesn't perform well after 150'?
Or the lens is not sharp after 150' even in manual focus?
Of course Manually you should be able to get a sharp picture at any distance, of course taking other external factors in to account.

If you are talking about the AF system it sounds like an adjustment might be in order if your camera has that ability.