Sony ALC-F405S 40.5mm Front Lens Cap for SELP1650

The Sony ALC-F405S exists to solve a single, specific problem: keeping the front element of the SELP1650 — and any other 40.5mm-threaded lens — free from the dust, fingerprints, and micro-scratches that accumulate during storage and transport. It is a genuine Sony OEM lens cap, which means the interior diameter and clip geometry are machined to the same tolerances as the lens mount itself. That precision matters more than it sounds: a cap that fits too loosely falls off in your bag; one that fits too tightly risks scratching the filter thread when removed in a hurry. The ALC-F405S sits in the middle — secure enough to stay put, easy enough to release with a one-handed pinch before bringing the camera up to shoot.

In practical terms, this cap lives clipped to the SELP1650 whenever the lens is off the camera or being carried between locations. The pinch-style release is the ergonomically correct choice for mirrorless shooters who work quickly — street photographers, event shooters, and travel photographers who spend a day walking with a camera in their bag and need to be ready to shoot without a two-handed fumble. The cap is featherlight at 0.039 pounds and dimensionally minimal, adding nothing to the lens's already compact footprint. Its limitations are the universal limitations of any front cap: it offers no impact protection, no rear-element coverage, and it can be lost. Keep a spare if the SELP1650 is a lens you rely on daily.