The upcoming RF mount wide angle f/2.8L zoom will be wider than 16mm [CR2]

Canon Rumors Guy

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Canon has already mentioned that a trio of f/2.8L zoom lenses is coming in 2019 for the RF mount. It’s pretty obvious that we should expect some kind of “holy trinity” of lenses such as an RF 16-35mm f/2.8L. RF 24-70mm f/2.8L IS and an RF 70-200mm f/2.8L IS.
We’re being told that the wide angle lens for the RF “holy trinity” will be wider than 16mm. Both an RF 12-35mm f/2.8L and an RF 14-35mm f/2.8L have been developed for testing.

We have seen a patent for an RF 14-21mm f/1.4L, but don’t expect such a lens to surface in 2019. Included in the same patent is an RF 16-35mm f/2.8L and an RF 12-20mm f/2L. So we think it’s possible that a 12-35mm f/2.8L will what wins out.
Nikon will be coming with a 14-30mm f/4 S and we think Canon will definitely want to keep its lenses the most impressing in the full frame mirrorless world. As such, we expect them to a bit faster and a bit more extreme on the wide end...

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twoheadedboy

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Well, depending on price, and whether it comes out in an f/4 flavor later on, that could be exciting. I just don't use wide angle enough to buy a $3,000 or more flagship wide zoom.

Yes, for sure. f/4 and can use normal 77mm filters. I would actually take a 16-35mm f/4 on the RF mount because I'm assuming it would be much smaller, but a 12 or 14mm on the ultra-wide end would be intriguing (also assuming the quality is as good or better than what we have now).
 
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Del Paso

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It certainly will be easier for Canon to develop a higher quality wide angle zoom due to the shorter distance bayonet to lens , no need for retrofocus design. This has often been demonstrated by Leica with their superb M rangefinder lenses.
So, I expect some very exciting new wide angle lenses (zooms or primes). This being in my opinion the main advantage of mirrorless, no gains with tele lenses.
 
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As awesome as these lenses sound, I think it's pretty safe to assume that they'll wind up being roughly the same size and weight as the 28-70 f/2 RF, (or bigger!) so...

OK who am I kidding, if it's ultra-sharp even in the corners, I'd totally buy an f/2 or f/1.4 ultra-wide zoom, no matter how big and heavy it is. I might not take it on every wilderness backpacking trip, but it'd still be an epic lens whenever it's possible to bring it.
 
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I suspect coma won't be the highest priority for this set in the eyes of Canon. F/2.8 isn't the fastest aperture for astro. The priority is likely to be general use and sharpness. The f/1.4 and f/2 development projects would likely have coma as a higher relative priority. Man, that 1.4 makes me giddy with anticipation. Except it's Canon, so it'll be 3 years of anticipation.
 
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Steve Balcombe

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Yes, for sure. f/4 and can use normal 77mm filters. I would actually take a 16-35mm f/4 on the RF mount because I'm assuming it would be much smaller, but a 12 or 14mm on the ultra-wide end would be intriguing (also assuming the quality is as good or better than what we have now).
The original 16-35/2.8L takes 77 mm filters, and one of the characteristics Canon has talked about for wide/normal RF lenses is smaller front elements and larger rear elements. This is because they are not so strongly retrofocal so they don't need such extreme negative elements in the front group which are large and inclined to be bulbous in a DSLR lens.

So maybe an RF 14-35/2.8L could have a 77 mm filter thread?
 
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It certainly will be easier for Canon to develop a higher quality wide angle zoom due to the shorter distance bayonet to lens , no need for retrofocus design. This has often been demonstrated by Leica with their superb M rangefinder lenses.

This brings up a question: in the days of film the Leica M lenses could be excellent and small due to non-retrofocus (non reverse telephoto) designs. But I think when they went to the M digital there was a problem with angle of incidence with the M lenses interacting with the microlenses, that had to be corrected out in firmware. Wonder if Canikon will need this kind of fix.
 
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The original 16-35/2.8L takes 77 mm filters, and one of the characteristics Canon has talked about for wide/normal RF lenses is smaller front elements and larger rear elements. This is because they are not so strongly retrofocal so they don't need such extreme negative elements in the front group which are large and inclined to be bulbous in a DSLR lens.

So maybe an RF 14-35/2.8L could have a 77 mm filter thread?

Maybe I've missed something, but so far we haven't seen anything wider than 16mm and an aperture of at least f/2.8 with an actual filter thread. If I saw it right, all three RF wide-angle lens design patents showed a bulbous front element. Also, maybe the zoom range has be narrower, like 14-28mm f/2.8 or 15-30mm f/2.8, that sounds much more realistic.
Or it has to be reduced to f/4 like with the Nikon.
 
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