Hello to all moderators & senior member of CS, I have some queries n hope some kind soul can help me with it. Recently I got a 2nd hand 50mm f1.4 lens. Is it common for prime lens to collect dust just behind the front element. As far as I know zoom lens are more prone for dust to be collected. So therefore is there somewhere I can get it cleaned up for a cheaper price instead of going to the respective service centre to get it done. Do refer somewhere or someone who can get the job done.( Kindly provide address or contact number). Thanks very much!