Cars in testing are often spotted in zebra-like looks that would make an active autofocus system struggle. Other cameras like SLRs have another form of autofocus which looks at contrast in the subject, to make its focus adjustment.
Again all the black and white swirls and lines on a prototype car make it nearly impossible for even some of the better autofocus systems to work. Add in the fact that cars in testing are usually on the move and you'll see it's not that easy getting those spy photos.
Opinions vary about the different designs of car camo. Brenda Priddy is a legendary automotive spy photographer, her photos appearing in almost every major auto magazine, paper and website. She tells us, "Frankly, I find the new breed of camo (swirly lines and sometimes colorful patterns) very photogenic!" Priddy questions the function of the camo too. "They haven't interfered with my camera's focusing abilities, and they help make the photo even more interesting," she said. Further mocking those she stalks for a living, Priddy adds, "It seems the camouflage changes every year. I can't wait to see what they come up with this year."
The curve of that SUV's fender is highly classified, you guys.