A patent showing ultra wide angle optical formulas for APS-C mirrorless cameras has appeared.
Optical Formulas:
- 18-45mm f/3.5-5.6 IS
- 9-18mm f/4-5.6 IS
- 11-30mm f/3.5-5.6 IS
- 10-20mm f/4-5.6 IS
Canon News notes that the lens element designs look like they could be collapsible.
