Well Documented Live View Exposure Simulation Issue

Question

I'm including a number of links which document this issue across multiple canon cameras. After doing a search on the canon forum, I can't find this particular issue, so I thought I'd post and see if we can get an official solution. (New to the Canon forums, so if I'm not looking in the right place, please let me know.)
In my opinion, the vimeo link illustrates this best. (and while the 2nd link says "solved" ... perhaps the solution could be described as "janky" at best.)
Basically, from what I can gather: The Live View (*in photo mode) uses the lens's aperture data to update the exposure simulation parameters. This effects the way the LCD and the Histogram interpret exposure settings. If you are using a lens without these digital chips, the Exp. Sim. parameters don't get updated and the liveview/histogram will sometimes appear under exposed when compared to the actual photograph (anywhere from -1 to -4 stops from what I've seen).
What's strange is that this problem disapears in video mode. Perhaps I don't understand the real issue, but it sounds like a firmware update is needed. Is there an update available(or will there be) that fixes this problem?
https://vimeo.com/43633270
http://www.dvxuser.com/V6/showthread.php?246032-dark-live-view-on-T2i-550D-when-using-vintage-manual...
http://www.dvxuser.com/V6/archive/index.php/t-247001.html

Answer 1

If I understand you correctly... you're referring to a 3rd party lens designed to fit on a Canon EOS body as an "EF" lens -- not actually suggesting that Canon themselves make a lens that has the problem.  
Niether Canon nor Nikon (nor anybody else that I am aware of) release the specs to 3rd party lens makers.  Those 3rd parties reverse-engineer the cameras in an attempt to build compatible lenses.  Again, I'd stress that to my knowledge, ALL camera makers are the same in this respect.  It is not a differentiator.  
Rokinon (and the same lenses are sold under a variety of names) is known for their very cheap lenses.  It's a bit of a case of "you get what you paid for."  
I don't work for Canon so I'm not trying to argue that you should only consider Canon products.  (I do like their products and am happy with all of my Canon gear.)  But I would probably not reduce my camera buying decisions be decided by just this one feature alone.  There are are so many aspects to consider when buying a camera.  Is this really that important to you?  
The guy in this video is using a Canon 5D III.  That's a $3500 camera body.  Realistically, no photographer who can afford a $3500 camera body is going to shoot with a Rokinon 14mm lens -- and then have the audacity to expect that it's Canon's fault when the cheap lens isn't fully compatible with the high end $3500 body.   :-/
There are a number of 3rd party lens makers... Sigma, Tokina, Tamron... and then there are some very high end lens makers... Schneider, Ziess, etc.   But when these lens makers build lenses for the cameras, they actually do tend to work correctly (not always... and sometimes a lens that worked with one body might not continue to work years later when Canon comes out with newer bodies... but Canon's own lenses DO work EVEN when you upgrade camera bodies.  Canon makes certain of that.)
Rokinon, however (and the same lenses are sold under multiple names... Samyang, Bower, Pro-Optic, etc.) are known for their especially cheap, basic, low-end lenses.  If you are going to buy an exceptionally cheap, basic, low-end lens... you should probably not be at all surprised to learn that there are limitations.   Notice, for example, that the lens has an aperture ring on the lens... modern lenses don't do that anymore.  
Tim Campbell
5D II, 5D III, 60Da