A man’s piece of photographic equipment (4)
I believe the answer is:
lens
This clue could be a double definition.
'a man's' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'piece of photographic equipment' is the second definition.
(camera lens)
Can you help me to learn more?
(Other definitions for lens that I've seen before include "town in France" , "Focussing glass" , "Aid for viewing" , "Dark cloud; shining light" , "optical equipment" .)