Canon Patent Application: EF-M kit zoom improvements
This patent application discusses a variety of kit zooms for the EF-M mount. This patent is mostly trying to achieve excellent optical performance, and a low amount of vignetting in the extremities.
image pickup optical system used in an image pickup apparatus (camera), there is a demand for a zoom lens having a short overall length, a compact overall system, and high optical performance over the entire zoom range. Also, if the angle of incidence of the off-axis light beam on the image pickup element is large, shading (color shading) and lack of peripheral light amount occur, so that it is required to be a zoom lens having good telecentricity on the image side.
The kit zooms mentioned in this patent application are the;
- 16-50mm 3.5-5.6
- 15-45mm 3.5-6.3
- 18-130mm 3.4-5.6
- 18-200mm 3.5-6.3
- 15-130mm 3.5-6.3
Japan Patent Application 2019008235
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