Canon Patent Application: Canon RF Macro Lenses

One series of lenses we can pretty confidently say will be coming to the RF mount. It's just a matter of time, and that's the true macro lenses for the RF system.

Right now, Canon is simply offering lenses with an advanced close focusing mechanism that allows for 1:3 to 1:2 macro, however, the true 1:1 macros have yet to make an appearance.

In this patent application, it's all about the 1:1 macros that alot of people are waiting for.  While alot of these macros seem certainly possible, with many of them the backfocus (BF) seems to be pretty low.  The distance between the sensor and the mount (not including the filter stack on top of the sensor) is 20mm.  So if the BF number is 10mm that means that the back element is sitting back at least 10mm from the mount that doesn't include any protection that sits around the element as well which usually adds another 1-2mm..  I can respect a 3-6mm ingress, but 10mm or so seems a little much to me.  Thus a lot of these I'm going to say aren't that likely to be actually implemented.

I know our rumors have though that a 100mm F2.0 macro is coming - it's entirely possible that Canon will create more than one and do the familiar USM / STM segregation in between the two.

Here are the embodiments below;

Not probable embodiments

Canon RF 85mm F2.8 Macro

focal length           84.92
F number                2.92
Half angle of view (°) 14.29
Image height           21.64
Lens length           120.23
BF                     10.60

Canon RF 95mm f2.8 Macro

focal length           96.96
F-number                2.92
Half angle of view (°) 12.58
Image height           21.64
Lens length           120.06
BF                     10.61

Canon RF 100mm F2.8 Macro

focal length           99.30
F number                2.92
Half angle of view (°) 12.29
Image height           21.64
Lens length           161.52
BF                     11.10

Possible embodiments

Canon RF 95mm F2.8 Macro

Focal length           94.82
F-number                2.92
Half angle of view (°) 12.85
Image height           21.64
Lens length           124.00
BF                     14.11

Canon RF 100mm F2.8 Macro

focal length           99.75
F number                2.92
Half angle of view (°) 12.24
Image height           21.64
Total lens length     169.97
BF                     14.00

Japan Patent Application 2020-091334