Personally, I'm not really bothered by other people's poor English usage or grammar, provided they get their intended meaning across. In any case, language is constantly evolving so many examples of what we consider bad English now might well enter dictionaries some time in the future. One example is 'miniscule', which is spelt that way so often that it has entered many dictionaries as an official variant of 'minuscule.' And that's fine. Just like the law, language is our servant, not vice versa.
Anyway, to give this thread a photographic flavour, and in case anyone cares about getting it right, please note that 'lens' is a singular noun. If you want to describe something that a lens has, it is lens's, not lens'. The plural equivalent is lenses'. Similarly, someone's name ending with an 's' is singular, e.g. Mr Harris's, Miss Perkins's, not Mr Harris' or Miss Perkins'. I mention it because, although it seems right to me that popular, enduring spelling variants should enter the dictionary, I don't think bad grammar should be passed into official usage quite so readily.