It's grey and cloudy here today and using window light I set my Vivitar 35ES to ASA 800 and 1/8 shutter speed. Like Brett's, my camera's meter also indicated an aperture of f/11. Your camera is probably OK, Greg. f/11 and 1/8 @ 800 ASA seems about right to me.
I use a 1.5v silver cell battery and shoot print film only. The Vivitar 35ES is a sweet camera. It's my favorite tool for available light.
PS - Welcome to the fourm.