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Author Topic: EF 300 f/4L IS II Patent  (Read 12443 times)

CR Backup Admin

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Re: EF 300 f/4L IS II Patent
« Reply #15 on: February 16, 2011, 12:41:44 AM »
Canon still includes examples with pellicle mirrors in some of their patents, and they haven't released one for many years.  Many patents are filed to protect a technology and prevent someone doing something clever with it.

Companies are often blind to inventors ideas, the company I worked for turned down a patent by a employee that covered a method to deal with the Y2K situation.  They signed over the rights to him, and he had it patented.  When it became a very popular solution, he popped up with his patent and cleaned up.

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Re: EF 300 f/4L IS II Patent
« Reply #15 on: February 16, 2011, 12:41:44 AM »

GMCPhotographics

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Re: EF 300 f/4L IS II Patent
« Reply #16 on: February 16, 2011, 06:34:42 AM »
Personally, I hope the 400mm f/5.6L gets updated first...

I really hope they change that one to a 500 f/5.6 L IS ... that would be a hotter item than a themos full of lava

And heavier too!




yes, but not prohibitively so.  adding IS to the 400 f/5.6 is bound to up its weight already anyway.  meanwhile there are Sigma zooms that go to 500mm featuring OS that weigh in under 2 kilos; I don't think there's any reason a canon 500 f/5.6 L IS prime lens should be any heavier.  1900g for a tack-sharp 500mm lens would be very exciting for a lot of people.  the new 500mm f/4 L IS II, despite its major weight reduction, still comes in at over 3 kilos.  it's a world of difference

The front element alone would make this a hugh ticket, high weight item. The current 400mm f5.6 can get away with a 77mm front filter. A 500mm f5.6 would need a front element of around 90mm....which is quite close to the size of front element in a 300mm f2.8. So it'll be in that kind of price / weigth bracket.

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Re: EF 300 f/4L IS II Patent
« Reply #16 on: February 16, 2011, 06:34:42 AM »