Camera makers put out by lack of light — not right (5)
I believe the answer is:
kodak
'camera makers' is the definition.
(camera company)
'put out by lack of light not right' is the wordplay.
'put out' becomes 'ko' (abbreviation for knock out).
'by' means one lot of letters go next to another.
'lack of light' becomes 'dark' (dark is the absence of light).
'not' is a deletion indicator.
'right' becomes 'r' (common abbreviation).
'dark' with 'r' taken out is 'dak'.
'ko'+'dak'='KODAK'
(Other definitions for kodak that I've seen before include "Eastman's photographic company" , "Photo film company" .)