I'm feeling the need to add something a little longer to my lens collection. Right now the longest I have is the Olympus 4/3 40-150mm, which is excellent, but sometimes isn't quite enough. What I'd like is a 200mm (maybe 250?) with either of the following characteristics: (a) Significantly faster than my 40-150mm (f/5.6 at 150mm); or (b) Significantly higher IQ than my 40-150mm, so I can better crop Obviously I'd like to have both of these things (and light as a feather as well!) but I'm trying to be realistic, because I can't afford to spend too much on it. My budget is probably < $100, unless something is just too good a deal to pass up. One more thing: I've tried several 300mm legacy lenses and rejected all of them. Either they were too heavy and unwieldy, or had poor IQ (especially CA), or both. That's why I've set my sights on something smaller. Suggestions?