Hello, I am looking for a flash like the Vivitar 283 circa 1980 that does two things: 1. senses light reflectance and exposures accordingly 2. does not sense reflectance but dumps a full charge that has the same large luminance every time. Useful for painting with light. Can't remember what this number 2 feature is called. My 283 was lost 25 years ago. Bought a Vivitar SF 4000 and it doesn't have this second feature. If you know what I'm talking about here, can you recommend a flash (under $100) that has both features? Many thanks.