I purchased a Samsung 27 inch external monitor to use with my 15 inch I7 Quad Core Mac Book Pro which was purchased last year. The monitor is not as clear as I expected. I have it on 1080P resolution. I used a Mini Display Port connected to a HDMI cable. I use it for photography and clear is extremely important. Is this the way it goes when you use an external monitor? I dont want to pay the high price Apple wants for their displays. Any suggestions