I have been messing around for a few hours with manual mode on my 7D and reading up on the Histogram.
Ok so I went out today and it was cloudy outside and decided to take a few pics of some houses in the making. I went with 1/125 f/4.0 ISO 100 and the meter was racked to one side and flashing. It was centered when I reached 1/1000 f/4.0 ISO 100. Took the shot.
Went home put a Sprite box infront of my 580 EX II E-TTL mode EC +2 and set the camera on a tripod 20 feet away. zoomed in to 200mm and used 1/250 f/5.6 ISO 100 and once again the settings were racked to one side and flashing...took the shot.
Loaded it in my PC and saw that the first shot outside where the camera meter was centered, the shot was underexposed (I had to up the brightness +1.33 in DPP) and the one I took inside with the flash which the camera said not to take came out fabulous...colors of the Sprite box was very acurate.
No what the heck am I suppose to understand out of this?