That's what a Canon patent application seems to suggest, a 300mm f/2.3 mirror lens. Read…
Well, this is an interesting Canon patent application we spotted (20180164603), and it shows how much care Canon applies to details.
Some background information first. Simplifying it very much, the image stabilisation system of a lens is build on top of a vibration gyroscope sensor. The process of stabilising an image in the lens occurs through a image (shake) correcting unit. The correcting unit uses electromagnetic fields, generated by applying current to a coil.
The generated electromagnetic fields can influence the electronic circuitry and hence may degrade the image quality by generating noise in the image. Turns out that shielding the coil isn’t that easy.
If I got the patent right, it tries to reduce the magnetic field by clever use of non-magnetically conductive materials and shielding. From the patent literature:
According to one aspect of the present invention, there is provided an imaging lens including: a lens; an image shake correcting action unit provided movably in a direction perpendicular to an optical axis of the lens; a stationary unit for supporting the image shake correcting action unit; a permanent magnet provided on one of the image shake correcting action unit and the stationary unit and a coil provided on an other; a drive circuit for moving the image shake correcting action unit relative to the stationary unit; a mount section for being connected to an imaging unit having an imaging element; and a conductive member which is nonmagnetically conductive and disposed between the coil and the mount section so as to include a facing surface facing a surface formed by a binding wire of the coil and having a larger area than a surface formed by an inner periphery of the coil.
This patent application might go into production one day.
Other Canon patent applications we think might get into production in the next few years are these:
- Patent application describing how to improve burst rate by compressing raw files
- Patent application describing a new way to review photos from a sequential shot
- Patent application that describes technology to improve wireless communication while reducing power consumption
- Patent application to spot and reduce moire artefacts in image data
- Patent application for weather sealed lens adapter