A new Canon Japan patent shows the optical formulas for various RF 50mm f/1.4 designs as well as an RF 35mm f/1.4. This patent deals with increasing focusing speed when using lens designs with large diameter elements.
I don't think any of these optical formulas will become products, so the dream of a new 50mm f/1.4 from Canon probably won't be coming true any time soon.
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though my 100mm f2.8 is still one of the sharpest lenses I’ve ever had.
The standards have changed in the past few decades. Technically, sensors have more details than most films, and the standard of living has raised, and people can and do print larger.
But I've also found that fine grain 35mm film is as brutal on lenses and technique as a 5DS when you start scanning and outputting to the same kind of sizes we routinely do today.
nah, film is easy, by today’s standards. And by the way, lens manufacturers used to lie all the time about flat field (Leica, I’m looking at you!). Film in film gates where the back plate doesn’t clamp down on the film, isn’t flat. Think about everything that film is and what the requirements for mechanical operation is, and you’ll understand why. It’s a major reason why film lenses can be fairly sharp in the center, and so bad everywhere else, for digital. That’s for lower rez digital. We began, in my lab, to see that for 6MP.
I hoped for an EF 50mm f/1.4 IS USM along the lines of the 24-28-35mm trio upgrade since, well, the upgrade. Apparently its not in the cards.
I don't think we'll be seeing USM in non-L primes from now on.
Yet, the 50 M, 75 M, 90 M, 135 M and all the other Leica R APO vintage lenses are still tack sharp, even in the extreme corners.
Even most of my Olympus lenses were unusable for digital... and got sold:cry:
by the way, apochromatic lenses aren’t necessarily sharper, nor do they always have flat field. It just means that three colors focus on the same plain, curved or flat. Stopping down a couple of stops, as always, results in better performance across the frame.