Canon RF 300-600mm f/4-5.6L IS USM: The Unicorn Lens Rides Again

We’ve been hearing about this mythical RF 300-600mm lens for so long it’s basically the Bigfoot of Canon rumors. But now whispers say it’s finally out in the wild, strutting around in testing like a cryptid caught on a shaky iPhone video. Supposedly, it’s headed for announcement before the end of 2025, which in Canon time means… maybe never, maybe tomorrow.

Variable Aperture, Variable Patience

The scoop? f/4 at 300-400mm, then gracefully sliding into f/5.6 by the time you hit 600mm. Variable aperture lenses always trigger purists, but hey, if Canon keeps the size, weight, and price only mildly absurd, people might just pretend to like it.

Speaking of price: the rumor fairy suggests $6,499 – $6,999. Translation: not under $6K, unless Canon suddenly discovers generosity as a business model.

Teleconverter Compatibility: Schrödinger’s Feature

Will it take teleconverters? Nobody knows. But imagine: slap on a 1.4x, and boom – you’ve got yourself an 840mm f/8 for photographing birds so small they’re basically rumors themselves.

Patent Teasers, Because Why Not

Yes, there have been patents for supertele RF lenses with variable apertures. None are this exact lens, of course, but patents exist to keep rumor writers busy, not to predict products.

RF 100–500mm, Meet Your Cannibal

Word is this new lens might “cannibalize” the RF 100-500mm f/4.5-7.1L. Which, let’s be honest, is Canon-speak for “we want you to buy the expensive one.” Sure, the 100-500mm is great, but faced with the option of stretching your wallet a little (okay, a lot) further, who wouldn’t go for the faster 300-600mm?

Variable aperture haters will whine, of course, but if the weight and handling are anywhere near tolerable, plenty of them will cave. Because nothing screams autobuy like a lens that costs as much as a used motorcycle.

Do We Believe?

This rumor supposedly comes from a “top-tier” source. Whatever that means in rumorland, it’s enough to stir the hype cauldron. Plus, whispers of a flurry of Canon announcements in the next few months-starting with the Cinema EOS C50. Add just enough drama to keep forums frothing.

Final Thoughts: Gimme.

In the end, does any of this matter? Not really. We’ll believe it when we see it in a press release. Until then, we’ll keep refreshing the rumor pages like addicts. Because, honestly, who doesn’t want to carry a 300-600mm L lens and live the teleconverter-free life of kings?

[via CR]