A new Canon patent application has popped up on the Japan Patent Office website detailing six new RF mount prime lenses ranging in focal length from 70mm up to 100mm. With the exception of an 85mm f/1.8, all of the lenses sport an f/2 aperture. So, they’re not super fast (with perhaps the exception of one), but they’re faster than zooms, yet slow enough to potentially be relatively low budget lenses.
The patent describes the optical formulas for six prime lenses in total.
70mm f/2
Focal length: 70.50mmF Number: 2.06Half angle of view: 17.06°Image height: 21.64mmLens length: 94.86mmBF: 17.89mm
80mm f/1.8
Focal length: 82.48mmF Number: 1.86Half angle of view: 14.70°Image height: 21.64mmLens length: 98.50mmBF: 16.84mm
80mm f/2
Focal length: 82.45mmF Number: 2.06Half angle of view: 14.70°Image height: 21.64mmLens length: 104.87mmBF: 17.60mm
82mm f/2
Focal length: 82.50mmF Number: 2.06Half angle of view: 14.69°Image height: 21.64mmLens length: 102.08mmBF: 14.92mm
85mm f/2
Focal length: 85.00mmF Number: 2.06Half angle of view: 14.28°Image height: 21.64mmLens length: 100.82mmBF: 16.76mm
100mm f/2
Focal length: 99.80mmF Number: 2.06Half angle of view: 12.23°Image height: 21.64mmLens length: 118.38mmBF: 21.99mm
The f/2 aperture would tend to put the 70-85mm lenses well into the “entry level” range, but 100mm f/2 would be very nice indeed. Sure, it’s not the Nikon 105mm f/1.4 or the Sigma 105mm f/1.4 Art, but it’s a stop faster than the Canon 100mm f/2.8 and Nikon 105mm f/2.8 macro lenses. So, it sits somewhere in between two pairs of rather expensive lenses. 100mm f/2 could turn out to be a good low budget compromise! Canon still has some way to go in fleshing out their RF mount lens lineup, particularly when it comes to more budget-friendly lenses. So while a patent doesn’t guarantee creation, it’s possible that one or two of these might pop up in the next year or two. But, a parent doesn’t guarantee creation, so don’t hold your breath. [via Canon Watch]
