Few days now I am just thinking of getting an Olympus 9-18mm, or an Olympus 12-40mm 2.8, or an Olympus 60mm 2.8 Macro. Last time I went to a Math Competition the 17mm 1.8 was not quite that lens I felt to need, last year at a similar Competition the 30mm Sigma and the 45mm 1.8 didn't, match my expectation ether. (It was too far or to near, I couldn't move too much around) So for indoors I think the 12-40 will be great, I guess For portraits, I have the 45mm for low light the 17mm 1.8 is great The 9mm will do maybe some wide angle So that lives me thinking of the 60mm Oly. For serious close-ups, Product, and some other stuff. I think first the 12-40 will be great. Why did I sell the 12-50. I didn't like the bokeh even wide open. I am just thinking aloud.