i have a 50'cron (v4) with a little problem.
There is "something" behind the front element (or somewhere else between the glasses, but in the front of the lens).
It showed up from one day to another so i guess it's dust, but i'm not sure.
It doesen't affect the image quality at all, but i want to sell the lens and this particle reduces the price about 150€.
Can i clean it myself (dissasembling the front element?) or what should i do?