Patent: Canon CN-E 24-70mm f/2.8

[Canon Rumors Guy]

<p>We’re getting closer to NAB 2016 in Las Vegas, and the cinema related patents are starting to roll out. The most recent is for a <a href="http://egami.blog.so-net.ne.jp/2016-02-11" target="_blank">CN-E 24-70mm f/2.8</a> lens</p>
<p>Patent Publication No. 2016-14816 (Google Translated)</p>
<ul>
<li>Published 2016.1.28</li>
<li>Filing date 2014.7.3</li>
<li>Zoom ratio 3.00</li>
<li>Focal length 24.00 48.00 72.00</li>
<li>F-number 2.80 2.80 2.80</li>
<li>Half angle of 32.94 17.95 12.19</li>
<li>Image height 15.55 15.55 15.55</li>
<li>The total lens length 241.06 241.06 241.06</li>
<li>BF 49.16 49.16 49.16</li>
</ul>
<p>We expect to see at least 2 new lenses from Canon for NAB 2016, as well as more information about the 8K replacement to the Cinema EOS C500 camera.</p>
<p>More to come on NAB in the near future…</p>
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[AvTvM]

repackaged EF 24-70 II ... or "really new"?
If the first, we will at least get to know the T/ value.

 

[cpreston]

Knowing the T value would be nice for these cine zooms. Do the cine zooms actually maintain transmission throughout the zoom range for a given aperture setting? Most of the L series zooms do not maintain transmission except when wide open and it is extremely annoying for video.

 

[hendrik-sg]

Transmission is only teh value in the center of the image, everywhere else, it has to be multiplied by the vignetting.

As far as i know, for cine Lenses ist's important that they are parafocal, have few or better no vignetting and that a line of lenses have similar color reproduction.

So if they bring a multi k$ cine zoom, it should be developped with a different set of priorities than a still lens

Maybe cheap cine lenses (samyang maybe) could be only mechanically changed (repacked) but i would not expect this for a pro lens.

Beside this, i would really like to see a comparision of a cine lens with a still lens, one of the ef primes for example, why not the 50 1.2

 

[Local Hero]

Most of Canon's Cine zooms don't hold their stop throughout their zoom range.

17-120mm, 30-300mm and 50-1,000mm all don't.

 

[DanCarr]

What's odd about this is that the image height suggests that this isn't a full frame lens. I know none of the other CN-E zoome lenses are full frame either, it's just that the range of 24-70 is typically associated with a full frame system. That range on a super 35 sensor size is decidedly less useful and "general purpose" IMO. I noted the same thing with the 70-200 CN-E patent a while back as well. You'd think they would just match the Zeiss cine 70-200 and 24-70 which do offer full frame coverage. Particularly with the new Vistavison sensor in the RED camera as well which has a much larger image circle than a super 35 lens can handle.

Maybe I'm wrong in the way I'm interpreting the "image height" in the patent? If this was a lens that covered a full frame sensor then it would truly be something for filmmakers to get excited about.