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DO Lenses Alive & Well 4 More Patents Published for Large Canon DO lenses β­β­β­β­πŸ“πŸ“

May 24, 2013

DO Lenses are Alive and Well. 4 More Patents Published for Large Canon DO lenses. The one of note is the 500 f/4, a lens that would be a very solid follow-up to the EF 400 f/4 DO IS.

βœ” We’ve seen a lot of patents filed in the past, and very few of them have actually come to market. It is good to see R&D is still going into DO technology, as I really enjoy the Canon f4 IS 400mm DO, its amazigly light with very high resolution.

βœ” Canon EF 400 f/4 DO IS Lens. Reminder of the characteristics of Canon’s breakthrough multi-layer diffractive optical lens technology provides photographers with superior super-telephoto performance in a smaller and lighter design with enhanced correction for chromatic aberrations. We’ve also added our highly effective Image Stabilization system that gives the equivalent effect of a shutter speed two stops faster. And, it’s built to our professional standards with fast AF, full-time mechanical focus and dust and water-resistant construction.

βœ” We used this lens often for action sports, where the portability, and light weight design of this lens, far exceeds its 400mm f2.8 counterpart weighing in at around 12 pounds. This f4 DO version is about 1/3rd the weight, which makes a huge difference in shoting a 4 hour sports event.

βœ” Interpretation and self-description of the patent literature. Patent Publication No. 2013-64858. 2013.4.11 Release Date. Applction Filing date 2011.9.16

βœ” Focal length f = 392.12mm

βœ” Fno. 4.12

βœ” Half angle of Ο‰ = 3.16 Β°

βœ” Image height Y = 21.64mm

βœ” 262.14mm length lens

βœ” BF 69.97mm

βœ” Two fluorite Materials and anomalous partial dispersion DOE to use, reduce the chromatic aberration

βœ” Refractive power of the diffractive surface
Strong, but can reduce the chromatic aberration of the element itself, flare increases

βœ” The weaker, other optical element DOE play a role

βœ” Refractive optical unit DOE anomalous partial dispersion and bonding materials

βœ” DOE aspherical surface on the opposite side of the Vibration control Inner Focus

If you need a refresher course on MTF Charts. Go to this Link.⭐⭐⭐⭐⭐/

In Sum this MTF Chart is Very Favorable.

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