I really like a deeply washed out background as a backdrop. I expect using a 35mm film camera that f-stops is inversely related to depth of field. I assume this remains true for compound lenses. But now that there is a wide range of sensor sizes I'm not clear when I look at a lens what to anticipate for the depth of field.
How can I know what to expect for the depth of a field of a lens for a given sensor size? As part of that, is it true that depth of field is inversely related to f-stops, even for a compound lens?