You could buy a step up adapter ring, which I did, to use a more
common size such as 52mm. I have one on mine, but truthfully it
makes this small compact camera lose some of its charm. I never
had any flare problems with the RC, but I always observe my
scene and check for possible sources, and try shading with a
hand or book in dire circumstances. (its a bit tricky with a
rangefinder) Truthfully I dont even use this camera that often,
my finger always manages to get in a shot every 10 or some
frames LOL