Think of getting a adapter ring to step up for possible filters. Current 49mm C-PL caused heavy vignettes and i read somewhere here 52mm slim and above are the best bets. Though 62mm is the safest.
And the headache here is, I have an old SLR which is 52mm. Without any filter etc.
Thinking i might want to play around with the old SLR too. So, should i buy 52mm or 62mm ?
What about future expansions? Which is more common?