Nikon LF-1 Rear Lens Cap

The screw-on threading is perfectly snug on my 50mm, so it's obviously machined to spec rather than some loose generic cap. It's a simple black plastic piece, but it clicks on firmly and keeps the rear element safe from dust between shoots.

The screw-on mechanism feels much more secure than the push-on caps I've used before, and it fits my lens perfectly. It’s simple but exactly what I needed to keep the rear element safe when swapping glass. The rigid plastic gives a reassuring click when it’s fully seated, and the threading is smoot

Finally, a rear lens cap that actually screws on smoothly instead of catching on the threading. It fits my F-mount lenses perfectly and feels sturdy enough to keep dust out during storage.