Mike Lyle wrote:

But one doesn't need to be a botanist to recommend Aidan to lose the
"greengrocer's apostrophe". Aidan, there's always a strong temptation to
use an apostrophe in the plurals of abbreviations, but it's not
acceptable or necessary. If it's actually in the text of a dissertation,
I'd use the full form, "photographs". Have fun.

While I don't use an apostophe there, it's perfectly acceptable to do
so. It isn't a plural, it denotes abbreviated text - photo(graph)s

If you loo at the history of the apostrophe, it was used in the past on
plurals to show how one of these new foreign words should be pronounced
- ones like potato, tomato, banana etc.

Only a great deal later did the illuminati try to restrict it to
flagging missing letters or possessies.

--
Rusty