Is this a correct sentence? - 2

The D40X camera was made in the days when Nikon really put emphasis on the quality of mid-level DSLRS.

It's good - sounds almost conversational - like a tech conversation… Or like something someone would say in a powerpoint presentation to others in a corporate setting…

Its good when spoken but not so good when written.

It sounds correct… From the point of view of language
As for the information, I don't know whether it is correct or not

Fine, except use "DSLRs", not "DSLRS", so it's clear it's the plural of DSLR.