So after a lot of thought I've decided to keep my 20mm f1.7 despite its slow focusing and tendency to miss focus on my E-PL1. I'm keeping it because I like the FL and when it does focus in time and in the right place, the images are simply wonderful. I'm now debating whether or not to get a hood for it. I typically use hoods with all my DSLR lenses and with legacy glass on my E-PL1 to prevent flare and improve contrast, however, a hood with the 20mm f1.7 defeats some of the advantage of its pancake design. How much difference does a hood make with the 20mm in terms of preventing flare and improving/maintaining contrast? I'd prefer not to use a hood with the lens (I'm not worried about protecting the front element), but will get one if it really does make a difference in the images. Any experiences?