But not on night recce ops.
It might seem obvious, but flying at night, over a blacked-out landscape, is not going to produce good recce results!
During WW2, the only way to see an objective on the ground, at night, was to drop flares, which, if on a recce, would immediately alert the enemy and, as no bombs followed the flares, the intention would be obvious, thus alerting the enemy to a forthcoming attack, or that there was an interest in the target being illuminated. Apart from this, why try to photograph a potential target at night, with all the attendant problems and hazards, when it can be done in daylight, thus providing good, clear photos of what is required?