I'm trying to find the perfect lens for my Olympus Pen Mini. I have the kit lens that comes with it, and a Panasonic Lumix 45-200 mm. lens. Have also tried using Canon lenses with the adapter, but really don't seem able to get any decent results with manual focusing. The Panasonic does produce some good photos, but it's heavy and a bit cumbersome on the body of the Pen Mini. In another thread, Spatulaboy recommended the Panasonic Lumix 20mm f1.7. So I was about to buy one, when a friend came over and was playing with my camera. He pointed out that the maximum aperture on the Pen Mini is f3.5, so what would I gain by attaching a lens with an f1.7 aperture? Could some kind person explain, please, because it's all a mystery to me.