The Battle-class destroyer's aft anti-aircraft battery

Why does the Battle-class destroyer appear to have little armament aft?

That area carried substantial radar-directed 40 mm anti-aircraft firepower, with the exact combination varying by generation.

The after section can look lightly armed in a photograph because its weapons are less conspicuous than the main gun turrets. It carried substantial radar-guided 40 mm firepower. Different generations used different combinations of mountings and fire-control equipment. The apparent empty space therefore gives a misleading impression of the ship's anti-aircraft armament.