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A number of new catadioptric designs (generally known as “mirror” lenses) appeared in a patent software to Japanese authorities, together with a 1200mm f/8 and an 800mm f/5.6.
First referred to as out in a publish on An Picture on a Sensor, the embodiments present typical “mirror lens” development, however with a larger-than-typical variety of lens teams and components extending from the mirror optical tube, again towards the sensor.
This will likely suggest a a lot greater stage of aberration correction than is regular in such a lens. Most catadioptric lenses constructed for cameras are makes an attempt to get at giant focal lengths as cheaply as doable, and the catadioptric design permits for extra gentle gathering with much less glass.
They usually usually have much less size, too. As a result of the mirror design causes the sunshine to double-back on itself a pair instances, these lenses are shorter than different sorts of designs. The 800mm f/5.6 embodiment of this new patent software, for instance, has a lens size of solely about 13 inches. Lenses usually add a bit of little bit of size in precise manufacturing, however this 800mm lens would doubtless seem as an extremely-wide lens in regards to the size of the outdated EF 70-200 f/2.8, with maybe an inch or two added.
Canon had a variety of mirror-based lenses beforehand.
