Patent: Various RF mount zoom lenses, including an APS-C RF mount design

Canon continues to work on new zoom lens ideas for the RF mount according to this JPO patent, I can only see one lens below that makes sense for a consumer product, and that’s the Canon RF 24-70mm f/4 optical design.

Now hidden in here is an optical formula for what looks to be an APS-C RF mount optical design. The Canon RF 15-70mm f/4-7.1 has an image height that differs significantly from the other 4 optical designs, suggesting it’s for a smaller sensor. Please correct me if I’m wrong on that assumption.

Canon RF 24-70mm f/4

• Focal Length: 24.72-67.90mm
• F-Number: 4.12
• Half angle of view: 41.50 – 17.30°
• Image height: 19.69-21.64mm
• Overall lens length: 101.50-141.15mm
• Backfocus: 12.50-24.86mm

Canon RF 24-120 f/4-7.1

• Focal Length: 24.72-116.40mm
• F-Number: 4.04-7.31
• Half angle of view: 41.80-10.30°
• Image height: 19.90-21.64mm
• Overall lens length: 109.01-159.02mm
• Backfocus: 14.15-31.01mm

Canon RF 24-100mm f/4-7.1

• Focal Length: 24.72-101.85mm
• F-Number: 4.29-7.31
• Half angle of view: 41.80-11.80°
• Image height: 19.90-21.64mm
• Overall lens length: 107.52-158.03mm
• Backfocus: 13.48-35.52mm

Canon RF 28-80mm f/3.5-5.6

• Focal Length: 27.72-82.45mm
• F-Number: 3.53-5.88
• Half angle of view: 38.53-14.70°
• Image height: 19.69-21.64mm
• Overall lens length: 101.50-142.50mm
• Backfocus: 14.16-32.52mm

Canon RF 15-70mm f/4-7.1

• Focal Length: 15.45-67.90mm
• F-Number: 3.93-7.31
• Half angle of view: 42.40-11.37°
• Image height: 12.56-13.65mm
• Overall lens length: 71.26-113.36mm
• Backfocus: 12.40-24.51mm