In truth, my F2 meter is 2 stops off. On the other hand, my Canon F-1 is still darn accurate. Regarding overhead light, Canon solved the problem by giving you the option to backlight the display and even cooler, saves battery power by leaving the light on for 15 seconds before auto shut off. In practice, I make 95% of my images in situations where there is enough overhead light that I don't need backlight for either camera.