I started using Ektar 100 recently and I have issue getting the right color to show up when taking photo of the sky, deep blue type of sky. eg. ( power cables with sky as background) As you can see, the sky turns gray while the colors on the cable remains. This has happened several times, almost every time I expect it to happen, it happens irregardless of lens, aperture and shutter speed setting. I even tried using polarized filter just for the heck of it. It's not as bad as w/o the filter, but it still causes the sky color to be much less saturated than what it should be. I also tried auto color in photoshop, and the result was not good. It over corrects the color making it over saturated and became very grainy. The camera body I am using is Nikon F501, with Epson v700 to scan the negatives. So what can cause this or how can I correct the problem?