Kalt Plastic Rear Lens Cap for Pentax Screw Mount M42

The Kalt Plastic Rear Lens Cap for Pentax Screw Mount M42 is a simple but essential accessory for protecting compatible vintage screw-mount lenses when they are off the camera. Designed to fit M42-thread lenses, this rear cap helps keep the lens mount and rear optical element covered during storage, transport, or while organizing gear in a camera bag.

Compatible With

• Pentax Screw Mount M42 lenses
• Takumar M42 lenses
• and other compatible M42 screw-mount lenses

Reliable Everyday Protection

Rear lens caps play an important role in keeping delicate lens surfaces protected. This cap helps reduce exposure to dust, lint, fingerprints, and accidental contact with the rear glass or mounting threads. It is especially useful for photographers who store multiple lenses, rotate optics frequently, or travel with vintage equipment.

Made for M42 Screw Mount Lenses

Unlike snap-on body caps or bayonet-style rear caps, this model is intended for lenses using the classic M42 threaded mount, often called Pentax screw mount. That makes it a practical fit for many legacy lenses from Pentax and other manufacturers that adopted the widely used M42 standard.

Lightweight Plastic Construction

The cap is made from plastic, offering a balance of light weight, convenience, and sufficient durability for routine handling. It adds minimal bulk to stored lenses and is easy to keep as a spare in a pouch, case, or accessory drawer.

Useful Replacement or Spare

If an original rear cap has been lost or damaged, this Kalt rear lens cap is a practical replacement. It is also a smart spare for collectors and photographers working with multiple M42 lenses, helping maintain cleaner storage conditions and better lens protection over time.

Why Rear Lens Caps Matter

Although small and inexpensive, a rear lens cap can help extend the life of a lens by reducing unnecessary exposure of the rear element and mount. Vintage lenses in particular benefit from proper storage habits, and using a dedicated rear cap is one of the easiest ways to preserve condition and usability.

Specifications

• Product type: Rear lens cap
• Brand: Kalt
• Mount compatibility: Pentax Screw Mount M42
• Material: Plastic
• Manufacturer number: NP11122
• UPC: 096727111228