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+--- Forum: Canon EOS (https://forum.opticallimits.com/forumdisplay.php?fid=11)
+--- Thread: Canon EOS R system announced (/showthread.php?tid=4157)
RE: Canon EOS R system announced - Brightcolours - 10-30-2018
Quite positive/glowing review from Canon-fanboi Jared Polin.
https://www.youtube.com/watch?v=C791UkqhBU8
RE: Canon EOS R system announced - martind86 - 11-02-2018
Not very practical but remarkable optical achievement for sure (if it becomes reality):
https://www.canonnews.com/canon-patent-application-canon-rf-14-21-14
RE: Canon EOS R system announced - Brightcolours - 11-02-2018
Actually, the patent describes a 14.5-21mm f1.55 lens.
And a 16-35mm f2.8 lens, and a 12-20mm f2 lens.
RE: Canon EOS R system announced - Rover - 11-03-2018
You know they'd round the aperture figure down, and the focal length numbers in whichever direction helps selling it better.
Everyone does because - say - 24-70/2.8 sounds way sexier (and more marketable) than 25.5-65/2.95. 
RE: Canon EOS R system announced - Brightcolours - 11-04-2018
(11-03-2018, 04:24 PM)Rover Wrote: You know they'd round the aperture figure down, and the focal length numbers in whichever direction helps selling it better.
I know that Canon lenses are usually designed to be close to what they say they are. So, a f1.4 lens actually is a f1.4 lens. Making a fake example of the 24-70mm f2.8 does not change that much...
RE: Canon EOS R system announced - Rover - 11-04-2018
Check the DPReview.com data - they are actually measuring the focal length of lenses they evaluate. You may be in for a surprise - especially at the long end of zoom lenses, actual focal lengths are especially often shorter than stated.
That's not to say that slightly rounding focal lengths is not an industry wide practice. Who can blame them for that (I certainly do not).
RE: Canon EOS R system announced - Brightcolours - 11-04-2018
(11-04-2018, 10:38 AM)Rover Wrote: Check the DPReview.com data - they are actually measuring the focal length of lenses they evaluate. You may be in for a surprise - especially at the long end of zoom lenses, actual focal lengths are especially often shorter than stated.
That's not to say that slightly rounding focal lengths is not an industry wide practice. Who can blame them for that (I certainly do not).
1st of all, I somehow doubt that DPReview can measure focal lengths well ;
How are they going about to determine front and back nodal points? They probably use a simple formula which can't really be applied and will always give (too) short focal lengths.