"The turntable idea is not recommended by them especially since it will change the light source in relation to the object. As I said above, "The object and lighting should not move during photographing." " Well, I suppose they have their reason. Actually, I don't really see much of a difference in moving the camera or the item. IF, and I say IF, your lighting is "flat" everywhere with no shadows (I'm thinking of a Matchbox/Hotwheels car) except for directly underneath, I don't see how rotating the item could hurt. It's that "devil" or the "devil" of moving the tripod and making sure you are exactly the same distance from it each time. And, as I said, unless the lighting is perfect all the way around the object, moving the camera might still find a different lighting situation. If you copied the suggestion from the manual, I might say the sentence is ambiguous. Meaning don't try to take these kinds of pictures when the opject is in motion (or the light). But, it could also mean just what you said. See an earlier message here where Alpha explained how to get rid of sparkle and reflections. That's why I said he may have a better idea. To further address your question...diffused lighting is lighting that has been "scattered"...so to speak. Imagine a flashlight with it's beam focused from the reflector straight ahead. Focus it on a wall 10 feet away and you get a nice round spotlight. Now, hold a simple window curtain (or similar item) between the wall and the flashlight...you'll see the crisp spotlight on the wall change to a blurry one. That's because the light is being diffuesd (some) as it passes through the sheer curtain. Anyway, good luck with the project. Sorry I wasn't much help. On thing for sure, though...if you can set up something simple, it won't hurt to see what the results are. It may give you an idea of just how strictly you should adhere to the guidlines.