Nahaufklärer: Tactics etc. ?

[yogybär]

Does anyone know more about how these units were flying combat missions?
I think there were specific tactics for each type of plane (Hs126, Fw189, Bf110, Bf109), but I don't know too much - to be honest nearly nothing.

Of interest ware details like
- flight altitude
- flight size (109 often Rotte afaik)
- number of flights per day and Staffel
- did they also fly w/o cameras (i.e. as Artilleriebeobachter)
- ...

??

Any info, also for a good source (book, net) is wellcome.

Thanks!