Made of premium, high-strength, and heat-resistant polymer and stainless steel hardware, this snap-on Front Lens Cap from Bioluminous features locking grips and is specifically designed for the Sony FE 600mm f/4. The lens cap features rugged and durable spring-loaded release tabs that are large enough to mount and remove the lens cap while wearing gloves, and the cap offers a snug fit and can be mounted on the lens with or without the lens hood attached.
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This is just the thing to compensate for Sony's inexplicable decision to not include a regular lens cap with a fourteen thousand dollar lens. The fit is perfect, and the springs are strong enough that I'm confident it won't fall off. It's a much better choice than the weird faux leather wrap that comes with the lens (and no longer fits if you put a neoprene skin on the lens). It's definitely pricey for a lens cap, but I assume much less than repairing a scratched front element.