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Over the years I've seen some crazy designs patented by Canon and applications like this one are fun to read. I mean, here's a patent application where someone was told. “Go nuts, see what you can do”. Let's make no mistake the lenses described here would be big, heavy, and frighteningly expensive but we are here for that.
The purpose of these embodiments is to have an apodization effect (atypically a Defocus Smoothing Coating – or DS) and also have minimal vignetting.
Canon RF 70-200mm F2.0-2.8 DS
Focal length 71.79 99.55 193.18
F number 2.00 2.30 2.85
Half angle of view 16.77 12.26 6.39
Image height 21.64 21.64 21.64
total length 161.48 186.95 219.93
BF 15.67 20.48 31.62 Canon RF 28-70mm F1.6-2.0 DS
Focal length 28.91 50.03 68.11
F number 1.60 2.06 2.06
Half angle of view 36.81 23.39 17.62
Image height 21.64 21.64 21.64
Lens total length 157.90 171.01 179.46
BF 19.11 28.33 33.77Canon RF 35-70mm F1.8-2.0 DS
Focal length 35.02 50.03 68.11
F number 1.80 2.06 2.06
Half angle of view 31.71 23.39 17.62
Image height 21.64 21.64 21.64
Lens length 162.01 171.01 179.46
BF 22.26 28.33 33.77As with all patent applications these may never actually turn into actual products or even real patents. However, it's a look into what Canon is researching for future products.
So, I‘d guess you can count me out on these, if they become a product.
I guess the F-stops would need to be crazy.
Canon has a separate patent for dialing DS in and out which would be the best of both worlds.
The 70-200 f2.0 - 2.8 looks very interesting.
The 28-70mm f1.6 - f2.0 looks epic and it's probably easier to push the wider end brightness than the longer end. This lens could easily replace a few fast primes.
I like the idea of the 35-70mm f1.8-f2.0. I think i would be happier if it covered a slightly longer tele end like a 35-85mm f1.8-f2...that would really peek my interest.
"An object of the present invention is to provide a variable power optical system that obtains a uniform and good apodization effect over the entire zoom range and suppresses peripheral dimming."
The RF 70-200/2-2.8 patent shows a lens that when extended to 200mm is the same length as the EF 70-200/2.8L IS lenses.
Excuse me while I mop up the floor from my salivation
For me, the DS bokeh looks too much like fake/computational bokeh from a smart phone.
Hmmmmm. Taken another way, does this mean the fake/computational bokeh is actually a very good appoximation of the real/mechanical bokeh from glass, but it was just a bit ahead of its time? 😉
I believe some of these designs went into developing the 28-70mm, but maybe, just maybe these formulars will help developing a 70-135/ or 150 or 170mm F2 zoom. Keeping my fingers crossed 🙂
Theoretically, someone can do that with bespoke drop-in filters for the EF 85 f/1.4 IS but the bokeh balls would not be perfectly round like they are on the RF 85 DS.
The same thing can be done with front filters on the non-DS RF 85 L.
Going even brighter in aperture is a very good thing, whilst the non L-Zooms loose light every new generation (so to say in the last years). Yes, you can push the ISOs up, but the bokeh also gets lost when you stop down to f7.1 at 500mm or f9 at 800mm.
Canon also needs an affordable Zoommonster like the 35-150 f2-f2.8. maybe a 35-200mm f2.8, so you just need a 16mm-35mm f2.8 on the short end.
In Overall i like the concepts of going off the normal way, a bit crazy!