geekpower said:CanonFanBoy said:geekpower said:CanonFanBoy said:I wonder whether BR will appear here.
As everybody tells you every time you ask this about every new lens, no, BR is only useful for wide angle lenses.
Well, then why don't you explain to me why that is and what makes you say that... other than forum speculation. Show me the facts / data or where Canon says this. Then I'll stop asking. So far only the 35mm f/1.4 II has it. Personally, I think you are wrong. BTW, everybody does not tell me this. Just a few who have no facts to back it up. None.
Geek out over this:
http://lenses.reviewed.com/features/canon-quietly-shows-new-600mm-f4l-do-with-br-optics
Let me google that for you...
This is from Canon themselves:
http://www.canon-asia.com/cplus/en/br-lens-elements/
"As conventional glass lens combinations are unable to correct chromatic aberration, this is usually done using special lenses with different refractive indices, such as fluorite or UD lenses. However, there are some residual chromatic aberrations even these lenses may not be able to fully correct, which we refer to as “secondary spectrum”. Large, wide-angle lenses tend to be particularly prone to them."
So while BR certainly wouldn't hurt on a telephoto, the phenomenon that BR is meant to combat is much more severe in wide-angle lenses, and it's very reasonable to assume that from a bang for the buck perspective, that's where you will tend to see it applied.
Ahhh... but that is not what you wrote. You wrote: "BR is only useful for wide angle lenses." That's what you wrote. Now you admit, I see, that it can also be useful in telephoto lenses. The 135 f/2L (current lens) suffers from CA. So it is reasonable to ask if the new lens will have it. Especially since Canon has a 600 DO prototype with BR. Canon does not say in your googled link what you want Canon to say. So, I guess I'll keep wondering whether BR will be included with each new L lens that gets released.
Bang for the buck? For who? I'd be happy to pay for it on my end, especially since I see how well it performs on my 35 II. You know what happens when we assume. People paying $10k for a great white would be happy not to have CA problems too. That's real bang for the buck.
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