One of the most popular, if not the most popular “big white lens” is the Canon 300mm f/2.8L IS. We're still waiting to learn more about an RF version of the lens. It's our understanding that Canon has done a complete ground-up redesign for the RF 300mm f/2.8L IS USM.
A new patent showing a bunch of super-telephoto optical designs has appeared, and all of these optical formulas come with a built-in 1.4x teleconverter.
We think that a 1.4x built-in teleconverter would be quite welcomed on an RF 300mm f/2.8L IS USM.
Canon RF 300mm f/2.8L IS USM 1.4x
- Focal length: 300.00mm
- F-number: 2.91
- Half angle of view: 4.12°
- Image height: 21.64mm
- Overall length: 320.00mm
- Back Focus: 49.68mm
There are also 400mm, 500mm, 600mm and 800mm optical formulas in this patent.
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I really want to see the first generation of big whites for the RF system, I have high hopes Canon put in the effort after the assuredly poor reception of the adapted EF/built in 2X TC lenses.
300mm f/2.8 was one of my favourite lenses for a decade, though I have since moved on to 400 and 800 as preferred focal lengths. I would however love a 120-300f/2.8 TC to take along with a 400 f/2.8 TC or shove them both into one monster 100/200-400 f/2.8 TC.
(Not that it'll be in my price range).
I and I am sure other would love Canon to bring out smaller super telephotos like Nikon has with the PF line as we had the DO line first as well. And if you, want to say Canon copied Nikon, it's your story tell it the way you want.
j-platpat
Today, their lens glossary states, "Fluorite is a monocrystal optical material that features a high transmission rate within both the infrared and ultraviolet zones. With its superb anomalous dispersion properties, fluorite intensely blocks the secondary spectrum in order to effectively correct chromatic aberration within the visible light spectrum – something that is more difficult to achieve at longer focal lengths. It is also significantly lighter than optical glass, giving you a more effective lens with less weight."
But several years ago, before they introduced FL elements into their supertelephoto designs (about two decades after Canon started doing so, though in fairness Nikon has used fluorite in microscope objectives for decades), Nikon's lens glossary for entry ED elements stated, "In the past, correcting this problem for telephoto lenses required special optical elements that offer anomalous dispersion characteristics - specifically calcium fluoride crystals. However, fluorite easily cracks and is sensitive to temperature changes that can adversely affect focusing by altering the lens' refractive index."
Now that they're using FL elements, they've updated their glossary entries to sing the praises of fluorite instead of only highlighting the weaknesses.
I pray they keep optical quality like the 300mm, as IMO it is their sharpest prime lens.
And the do not go higher than 10000 Euros. (Ok, this is wishful thinking. Realistically 12000 € as Canon knows how to milk us fanboys)