Contrex uses the example eye and eyed and eyed "drops the e"
or else it would be eyeed. But eyed does not have an apostrophe because it is a verb and not possessive.
With the a at the end of the word camera the e would also be dropped.
Because it is possessive and a letter is dropped an apostrophe would be added.
Eyed a letter is dropped but it is not possessive.
Camera is possessive so it is not camerad (like eyed) but camera'd