Originally posted by 08amczb The K series has 52m filter threads in general. Now I prefer K series, but I can't really explain why. I read about better IQ with K series, but I couldn't check it. Size is not an issue with these lenses I think.
Yep I realise that. I wasn't suggesting the M series because of the filter thread, rather just the benefit of getting a whole line-up of lenses from the same series (rather than getting a mix of M and K lenses and needing both 52mm and 49mm filters). It's not a huge issue, just a convenience thing...